In the Stockfish forum : https://groups.google.com/forum/?fromgr ... 101-125%5D
I discuss with Ivan about a supposed hard set (1190 mainly old position). I try to convince him a lot of positions are bad (around 70-80%), but he believes a lot of key-moves are correct.
So I will discuss positions in this thread, trying to classify the test positions : 1) bad, 2) good or 3) need more investigations.
I'll 10 to 20 positions from time to time.
Results and the PGN are here : http://chess.ultimaiq.net/stockfish.html
EPD file is here : http://home.scarlet.be/vincentlejeune/c ... 90-pos.epd
The Arena log, with 30 sec analyse (3 best moves) with Stockfish-Matefinder is here : http://home.scarlet.be/vincentlejeune/c ... ses1190.7z
note the first position was missing, all the numbers are shifted by 1.
Debugging a supposed hard positions set
Moderator: Ras
-
Vinvin
- Posts: 5334
- Joined: Thu Mar 09, 2006 9:40 am
- Full name: Vincent Lejeune
-
Vinvin
- Posts: 5334
- Joined: Thu Mar 09, 2006 9:40 am
- Full name: Vincent Lejeune
Re: Debugging a supposed hard set. Positions 1 to 10.
Positions 1 to 10.
8/7p/p1pPk1p1/2Pn1pP1/1P1B3P/P4K2/8/8 w - - bm Be5;
4b3/8/1p2pk1p/4p3/1PP1P1PP/3B1K2/8/8 w - - bm b5;
8/2b2k2/p4ppp/1p1p4/1B1P4/1P2P1P1/P4P1P/6K1 b - - bm h5;
8/8/2p1pk2/1b1p3p/1P1PpP1P/4P3/1R3KB1/r7 b - - bm Rc1;
1r4k1/6pp/p7/2Pp4/8/4P3/P5PP/3R2K1 w - - bm Rxd5;
8/8/3k4/3p3n/1P1N1p1P/5K2/8/8 w - - bm Nc2;
2kr3r/pb2n3/1pn1p1pp/2p5/3bNP2/2P3PN/PP3BBP/R1K4R b - - bm Bxf2;
4R3/8/8/6p1/5p2/3k1P1P/6PK/2q5 b - - bm Qe3;
8/pr1r1k2/R1p3p1/2Bb1p1p/PP2pP1P/K5P1/2R1P3/8 w - - bm e3;
5k2/1p3p2/3p1n2/1p1P1N1p/1P1R1P1P/2rB2P1/r1P1K3/8 b - - bm Rc7;
1) Key move Be5 ?
SF-MF gives about the same score for the 5 best moves :
40/90 02:26 2 035 529k 13 939k +10,76 50.Be5 Kf7 51.Ke2 Ke6 52.Kd2 Kf7 53.Kd3 Ke8 54.Ke2 Kf7 55.Kd2 Kf8 56.Bg3 f4 57.Bf2 f3 58.Be3 Ke8 59.Kd3 Kd7 60.Ke4 Nc3+ 61.Kxf3 Nb5 62.Bc1 Nd4+ 63.Ke4 Nc2 64.a4 Nxb4 65.Bd2 Nc2 66.Bc3 Na3 67.Kd3 a5 68.Bb2 Nb5 69.axb5 cxb5 70.Kd4 Kc6 71.Bc3 b4 72.Bxb4 axb4 73.Kc4 h5 74.gxh6 g5 75.h7 gxh4 76.h8Q
40/90 02:26 2 035 529k 13 939k +11,86 50.Ba1 Kf7 51.Be5 Ke6 52.Kf2 Kf7 53.Ke2 Ke6 54.Kd2 Kf7 55.Kd3 Ke8 56.Kd4 Kd7 57.Bg3 Ke6 58.Bh2 Kd7 59.Be5 Ke8 60.Bg3 f4 61.Bf2 Kd8 62.Kd3 Kd7 63.Bd4 Ke6 64.Ke2 Kf7 65.Kf3 Ke6 66.Ke4 Kf7 67.Be5 Ne3 68.Kd3 Nf5 69.Bxf4 Ng7 70.Kd4 Ne6+ 71.Ke5 Nf8 72.a4 Ke8 73.b5 axb5 74.axb5 Nd7+ 75.Kd4 Nb8 76.d7+ Nxd7 77.bxc6 Nf8 78.c7 Kd7 79.c6+ Kc8 80.Kd5 h6
40/90 02:26 2 035 529k 13 939k +12,34 50.Bh8 Kd7 51.Be5 Ke6 52.Kf2 Kf7 53.Ke2 Ke6 54.Kd2 Kf7 55.Kd3 Ke8 56.Ke2 Kf7 57.Kd2 Ke6 58.Bg3 Kf7 59.Kd3 Ke8 60.Kd4 Kd8 61.Ke5 Kd7 62.Bf4 Nc3 63.Bd2 Nd1 64.Kf6 Nf2 65.Kg7 Nd3 66.Kxh7 a5 67.Kxg6 axb4 68.axb4 Ke6 69.h5 f4 70.h6 f3 71.h7 f2 72.h8Q f1Q 73.Qe8+ Kd5 74.d7 Ne5+ 75.Kg7
40/90 02:26 2 035 529k 13 939k +12,34 50.Bb2 Kf7 51.Be5 Ke6 52.Kf2 Kf7 53.Ke2 Ke6 54.Kd2 Kd7 55.Kd3 Ke6 56.Bh2 Kf7 57.Kd4 Ke8 58.Be5 Kd7 59.Bg3 Ke8 60.Ke5 Kd7 61.Bf4 Nc3 62.Bd2 Nd1 63.Kf6 Nf2 64.Kg7 Nd3 65.Kxh7 a5 66.Kxg6 axb4 67.axb4 Ke6 68.h5 f4 69.h6 f3 70.h7 f2 71.h8Q f1Q 72.Qe8+ Kd5
40/90 02:26 2 035 529k 13 939k +12,67 50.Bg7 Kf7 51.Be5 Ke6 52.Kf2 Kf7 53.Ke2 Ke6 54.Kd2 Kf7 55.Kd3 Ke8 56.Kd4 Kd7 57.Bg3 Ke6 58.Bh2 Kd7 59.Be5 Ke8 60.Bg3 Kd8 61.Ke5 Kd7 62.Be1 f4 63.Bf2 Ne3 64.Kxf4 Nf5 65.Ke5 Ng7 66.a4 Ne6 67.Be3 Nd8 68.Kf6 Ke8 69.Kg7 Nf7 70.Kxh7 Ne5 71.Bf2 Kd7 72.Bg3 Nf7 73.Kxg6 Ke6 74.h5 Nh8+ 75.Kg7 Nf7 76.Bf2 Nxg5 77.h6 Kd5 78.h7 Ne6+ 79.Kf7 Nd8+ 80.Kg6
Conclusion : Not a good test position.
2) Key move b5 ?
SF-MF gives about the same score for the 5 best moves :
46/66 07:33 6 369 322k 14 045k +58,65 1.Ke3 Ke7
47/66 07:33 6 369 322k 14 045k +58,72 1.Bf1 Ke7 2.Be2 Bd7 3.Bd3 Be8 4.b5 Kd6 5.h5 Kc5 6.Be2 Kd4 7.Kg3 Bf7 8.g5 Bg8 9.gxh6 Bh7 10.Kg4 Bxe4 11.Kg5 Bf5 12.Bg4 Bh7 13.Kf6 Bc2 14.Be2 Ke3 15.Kxe5 Kxe2 16.h7 Bxh7 17.Kxe6 Bg8+ 18.Kd6 Bxc4 19.h6 Kf3 20.h7 Bd3 21.h8Q Bf5 22.Ke5 Bg6 23.Qh3+ Kf2 24.Qh2+ Ke3 25.Qh6+ Kf3 26.Qf4+ Ke2
47/66 07:33 6 369 322k 14 045k +60,65 1.Kf2 Ke7 2.Kg2 Bd7 3.Kf3 Be8 4.Be2 Bd7 5.Bf1 Be8 6.b5 Kd6 7.h5 Kc5 8.Be2 Kd4 9.Kg3 Bf7 10.g5 Bg8 11.gxh6 Bh7 12.Kg4 Bxe4 13.Kg5 Bf5 14.Bg4 Bh7 15.Kf6 Bc2 16.Be2 Bf5 17.Kg7 Ke3 18.h7 e4 19.h8Q Kxe2 20.h6 e3 21.h7 Kd3 22.Qd8+ Kc2 23.Qxb6 e5 24.Qxe3 Bc8 25.h8Q
47/66 07:33 6 369 322k 14 045k +69,50 1.Be2 Ke7 2.b5 Kd6 3.h5 Bf7 4.g5 Bg8 5.Bd3 Bh7 6.gxh6 Kc5 7.Kg4 Kd4 8.Be2 Bxe4 9.Kg5 Bf5 10.Bg4 Bh7 11.Kf6 Bc2 12.Be2 Ke3 13.Kxe5 Kxe2 14.Kxe6 Bh7 15.c5 Bg8+ 16.Kd6 Bh7 17.cxb6 Kd3 18.Ke6 Kc2 19.Kf6 Kc1 20.b7 Kb1 21.b8Q Bg6 22.hxg6 Kc2 23.h7 Kd3 24.h8Q Kc2 25.g7
47/66 07:33 6 369 322k 14 045k +77,46 1.b5 Ke7 2.c5 bxc5 3.b6 Bc6 4.Bb5 Bb7 5.g5 h5 6.Ke3 Kf7 7.Bc4 Bc8 8.g6+ Kf6 9.g7 Kxg7 10.Bxe6 Bxe6 11.b7 c4 12.b8Q Kf6 13.Qd6 c3 14.Qd8+ Kf7 15.Qc7+ Kf6 16.Qxc3 Bg4 17.Qc7 Ke6 18.Qc5 Kf6 19.Qd6+ Be6 20.Qd8+ Kf7 21.Qb8 Kg6 22.Qe8+ Kf6 23.Qh8+ Kg6 24.Qb8 Bf7 25.Qd6+ Kg7 26.Qxe5+ Kf8 27.Qh8+ Ke7 28.Qb8 Ke6 29.Qc8+ Ke7
Conclusion : Not a good test position.
3) Key move h5 ?
SF-MF gives about the same score for the 5 best moves :
37/44 01:05 896 509k 13 687k +1,05 1. ... Bb6 2.g4 Bc7 3.f3 Ke6 4.Bf8 h5 5.gxh5 gxh5 6.Bc5 f5 7.Kg2 Bd8 8.Kf2 Bh4+ 9.Ke2 Bd8 10.Kd3 Bc7 11.h3 Kf6 12.Ke2 Ke6 13.Bf8 Kf6 14.Bb4 Ke6 15.Bc5 Kf6 16.Kf1 Kf7 17.Kg2 Ke6 18.Kf2 Bd8 19.Kg3 Bc7+ 20.Kh4 f4
38/44 01:05 896 509k 13 687k +1,03 1. ... Kg7 2.g4 f5 3.gxf5 gxf5 4.f3 a5 5.Be1 a4 6.bxa4 bxa4 7.Bg3 Bd8 8.Kf2 Kf7 9.Bf4 h5 10.Bd6 Ke6 11.Bc5 Bc7 12.h3 Kf6 13.Ke2 Ke6 14.Kd3 Bd8 15.Bb4 Bc7 16.Ke2 Bd8 17.Bf8 Bc7 18.Bc5 Bg3 19.Bb4 Bh4 20.Kd3
38/44 01:05 896 509k 13 687k +1,00 1. ... a5 2.Bc5 h5 3.h3 a4 4.bxa4 bxa4 5.Kg2 Ke6 6.Kf3 Bd8 7.Bf8 g5 8.g4 hxg4+ 9.Kxg4 Kf7 10.Bd6 Kg6 11.f4 f5+ 12.Kf3 Kf7 13.fxg5 Bxg5 14.Bg3 Be7 15.Ke2 Kg6 16.Be5 Bd8 17.Bf4 Be7 18.Bg3 Bf6 19.Kf3 Bd8 20.Be5 Bg5 21.Bc7 Be7 22.Bf4 Bd8
38/44 01:05 896 509k 13 687k +1,00 1. ... h5 2.h3 a5 3.Bc5 a4 4.bxa4 bxa4 5.Kg2 Ke6 6.Kf3 Bd8 7.Bf8 g5 8.g4 hxg4+ 9.Kxg4 Kf7 10.Bd6 Kg6 11.f4 f5+ 12.Kf3 Kf7 13.fxg5 Bxg5 14.Bg3 Be7 15.Ke2 Kg6 16.Be5 Bd8 17.Bf4 Be7 18.Bg3 Bf6 19.Kf3 Bd8 20.Be5 Bg5 21.Bc7 Be7 22.Bf4
38/44 01:05 896 509k 13 687k +1,00 1. ... Ke6 2.h3 h5 3.Kg2 a5 4.Bc5 a4 5.bxa4 bxa4 6.Kf3 Bd8 7.Bf8 g5 8.g4 hxg4+ 9.Kxg4 Kf7 10.Bd6 Kg6 11.f4 f5+ 12.Kf3 Kf7 13.fxg5 Bxg5 14.Bg3 Be7 15.Ke2 Kg6 16.Be5 Bd8 17.Bf4 Be7 18.Bg3 Bf6 19.Kf3 Bd8 20.Be5 Bg5 21.Bc7 Be7 22.Bf4 Bd8
Conclusion : Not a good test position.
4) Key move Rc1 ?
SF-MF sees no point for this move, position seems drawish, the winning line given has a bad move 52.Kg3??
SF-MF gives about the same score for the 5 best moves :
41/52 00:25 305 546k 11 885k -0,73 51. ... Rc1 52.Bh3 Bc4 53.Bg2 Bd3 54.Bh3 Ra1 55.Bg2 Bc4 56.Bh3 Ra4 57.Kg3 Ra3 58.Kf2 Ra1 59.Bg2 Ke7 60.Bh3 Rh1 61.Bg2 Rc1 62.Bh3 Kd6 63.Bg2 Bd3 64.Kg3 Re1 65.Kf2 Ra1 66.Kg3 Bf1 67.Kf2 Bb5 68.Bh3 Ra3 69.Bg2 Ba6 70.Bh3 Bd3 71.Bg2 Ra4 72.Kg3 Ra1 73.Kf2 Ra3 74.Kg3
41/52 00:25 305 546k 11 885k -0,73 51. ... Bc4 52.Bh3 Ra4 53.Kg3 Ra3 54.Kf2 Ra1 55.Bg2 Ke7 56.Bh3 Rh1 57.Bg2 Rc1 58.Bh3 Kd6 59.Bg2 Bd3 60.Kg3 Re1 61.Kf2 Ra1 62.Kg3 Bf1 63.Kf2 Bb5 64.Bh3 Ra3 65.Bg2 Ba6 66.Bh3 Bd3 67.Bg2 Ra4 68.Kg3 Ra1 69.Kf2 Ra3 70.Kg3 Bc4 71.Kf2 Ra4 72.Bh3
41/52 00:25 305 546k 11 885k -0,73 51. ... Ra8 52.Bh3 Ra3 53.Bg2 Ra4 54.Bh3 Ra8 55.Rc2 Bc4 56.Rb2 Ra3 57.Bg2 Ra4 58.Bh3 Ra7 59.Bg2 Ra3 60.Bh3 Ra1 61.Bg2 Ke7 62.Bh3 Rh1 63.Bg2 Rc1 64.Bh3 Kd6 65.Bg2 Bd3 66.Kg3 Re1 67.Kf2 Ra1 68.Kg3 Bf1 69.Kf2 Bb5 70.Bh3 Ra3 71.Bg2 Ba6 72.Bh3 Bd3 73.Bg2
41/52 00:25 305 546k 11 885k -0,73 51. ... Ra7 52.Bh3 Ra6 53.Rc2 Ra1 54.Rb2 Ra3 55.Bg2 Ra4 56.Bh3 Ra8 57.Rc2 Bc4 58.Rb2 Ra3 59.Bg2 Ra4 60.Bh3 Ra7 61.Bg2 Ra3 62.Bh3 Ra1 63.Bg2 Ke7 64.Bh3 Rh1 65.Bg2 Rc1 66.Bh3 Kd6 67.Bg2 Bd3 68.Kg3 Re1 69.Kf2 Ra1 70.Kg3 Bf1 71.Kf2 Bb5 72.Bh3 Ra3 73.Bg2
42/52 00:25 305 546k 11 885k -0,73 51. ... Bd3 52.Bh3 Bc4 53.Bg2 Ke7 54.Bh3 Rh1 55.Bg2 Rc1 56.Bh3 Kd6 57.Bg2 Bd3 58.Kg3 Re1 59.Kf2 Ra1 60.Kg3 Bf1 61.Kf2 Bb5 62.Bh3 Ra3 63.Bg2 Ba6 64.Bh3 Bd3 65.Bg2 Ra4 66.Kg3 Ra1 67.Kf2 Ra3 68.Kg3 Bc4 69.Kf2 Ke7 70.Bh3 Kf6 71.Bg2 Ra4 72.Bh3
Conclusion : Not a good test position.
5) Key move Rxd5 ?
Rxd5 seems a bit superior but other moves are winning too :
27/49 00:10 161 886k 15 084k +2,30 24.a4 Rb4 25.Rd4 Rb3 26.Kf2 Ra3 27.Rxd5 Rxa4 28.Ke2 Kf8 29.Kd3 Ra1 30.Kc2 Ra4 31.Kb3 Ra1 32.Rd7 Rc1 33.Kb4 a5+ 34.Kb5 a4 35.Ra7 Ke8 36.Rxa4 Rc2 37.Ra8+ Ke7 38.Ra7+ Kf6 39.g4 Rb2+ 40.Ka6 Ra2+ 41.Kb6 Rb2+ 42.Kc7
27/49 00:10 161 886k 15 084k +2,48 24.Kf1 Rd8 25.Rd4 g6 26.Kf2 Kg7 27.a3 Kf6 28.e4 Rc8 29.Rxd5 Rb8 30.Ke3 Rb1 31.Kd2 Ke6 32.Rd6+ Ke5 33.Rd8 Rb2+ 34.Kd3 Rb1 35.Rd5+ Ke6 36.a4 Rb3+ 37.Kc4 Rb2 38.h4 Rxg2 39.Rd6+ Ke5 40.Rxa6 Kxe4 41.Ra7 Rc2+ 42.Kb5 Kd5 43.Rd7+ Ke6 44.Rxh7
28/49 00:10 161 886k 15 084k +2,74 24.Rxd5 Rb5 25.Kf2 Kf7 26.Rd7+ Kf6 27.c6 Rc5 28.c7 h5 29.Kf3 Rc4 30.Ke2 g5 31.Kd3 Rc1 32.Ke4 Ke6 33.Rg7 g4 34.Kf4 Kf6 35.Rh7 Kg6 36.Rd7 Kf6 37.e4 a5 38.g3 Rf1+ 39.Ke3 Rc1 40.a4 Rc2 41.Kd4 Ke6 42.Rd5 Rxc7 43.Re5+ Kd6 44.Rxa5 h4 45.gxh4 Rc2 46.Rg5 Rd2+ 47.Ke3
Conclusion : Not a good test position.
6) Key move Nc2 ?
3 moves are clearly winning :
33/59 00:36 254 639k 6 973k +39,77 1.Nc2 Nf6 2.Kxf4 d4 3.Kf5 d3 4.Ne3 Nd5 5.Nc4+ Ke7 6.b5 Kd8 7.Ke5 Nb6 8.Nd2 Nc8 9.h5 Ke7 10.Kd4 Kf7 11.Kxd3 Kg7 12.Nc4 Kh6 13.Kd4 Kg5 14.h6 Kxh6 15.Kc5 Kg5 16.Nd6 Nxd6 17.Kxd6 Kh5
34/59 00:36 254 639k 6 973k +77,38 1.Ne2 Nf6 2.b5 Nh5 3.Kg4 f3 4.Kxf3 Nf6 5.Kf4 Kc5 6.Kf5 Ng8 7.Nd4 Ne7+ 8.Kf4 Ng6+ 9.Kg5 Nf8 10.h5 Kc4 11.b6 Kd3 12.Ne6 Nd7 13.Nc5+ Nxc5 14.h6 d4 15.Kg6 Kc3 16.b7 Nxb7 17.h7
34/59 00:36 254 639k 6 973k +77,46 1.Nb3 Nf6 2.b5 Nd7 3.Kxf4 Ke6 4.Kg5 Kf7 5.Nd4 Nb6 6.Kf5 Nc4 7.h5 Na3 8.Kg5 Nc4 9.Nf5 Ne5 10.b6 Ke6 11.b7 Nd7 12.Nd4+ Ke7 13.Nc6+ Kd6 14.Kf5 Kc5 15.Nd4 Nb8 16.Kf4 Nd7 17.b8Q Nxb8 18.Nf5 d4
Conclusion : Not a good test position.
7) Key move Bxf2 ?
The refutation of the move is in the PGN : "2. Nexf2" with an equal position.
SF-MF prefers 1...Bf7 holding the good bishop:
27/42 00:52 559 204k 10 614k -0,01 1. ... Bxf2 2.Nexf2 Kc7 3.Re1 Bc8 4.Ng4 e5 5.Nxe5 Nxe5 6.Rxe5 Nc6 7.Re3 g5 8.b3 Bf5 9.Re2 Bg4 10.Rf2 Rhf8 11.Rf1 Bf5 12.fxg5 Bxh3 13.Bxh3 hxg5 14.Rxf8 Rxf8 15.Kd2 Rf2+ 16.Ke3 Rxh2 17.Bf5 Ne7 18.Be4 Kd6
27/42 00:52 559 204k 10 614k -0,18 1. ... Bg7 2.Kc2 e5 3.Rae1 Kb8 4.Rd1 Kc7 5.Rhe1 Bc8 6.Rxd8 Rxd8 7.Be3 Nd5 8.Bd2 Bf5 9.Kc1 Be6 10.Kc2 a5 11.Nhf2 c4 12.Bh3 Bf5 13.g4 Bxe4+ 14.Rxe4 exf4 15.Bxf4+ Nxf4
Conclusion : wrong key move.
8) Key move Qe3 ?
8 moves are clearly winning :
43/57 00:23 417 940k 17 825k -123,03 1. ... Qb2 2.Kg1 Qc3 3.Re6 Qa1+ 4.Kh2 Qb2 5.Kg1 Qb1+ 6.Kh2 Qa1 7.Re7 Qf6 8.Re1 Qg7 9.Re6 Kd2 10.Re8 Qd4 11.Re6 Qd5 12.Re8 Qb5 13.Re7 Qf5 14.Re4 Qf6 15.Re8 Qa1 16.Re6 Qd4 17.Re4 Qc5 18.Re8 Qe3 19.Ra8 Qe5 20.h4 gxh4 21.Ra7 Ke2 22.Kh3 Qg5 23.Ra2+ Kd3 24.Kh2 Qg3+ 25.Kg1
43/57 00:23 417 940k 17 825k -123,03 1. ... Qc4 2.Re4 Qc5 3.Re6 Qd4 4.Re4 Qa1 5.Re6 Qb2 6.Kg1 Qb1+ 7.Kh2 Qa1 8.Re7 Qf6 9.Re1 Qg7 10.Re6 Kd2 11.Re8 Qd4 12.Re6 Qd5 13.Re8 Qb5 14.Re7 Qf5 15.Re4 Qf6 16.Re8 Qa1 17.Re6 Qd4 18.Re4 Qc5 19.Re8 Qe3 20.Ra8 Qe5 21.h4 gxh4 22.Ra7 Ke2 23.Ra3
43/57 00:23 417 940k 17 825k -123,03 1. ... Qa1 2.Re6 Qb2 3.Kg1 Qb1+ 4.Kh2 Qa1 5.Re7 Qf6 6.Re1 Qg7 7.Re6 Kd2 8.Re8 Qd4 9.Re6 Qd5 10.Re8 Qb5 11.Re7 Qf5 12.Re4 Qf6 13.Re8 Qa1 14.Re6 Qd4 15.Re4 Qc5 16.Re8 Qe3 17.Ra8 Qe5 18.h4 gxh4 19.Ra7 Qe6 20.Rb7 Kd3 21.Rb2 Qe5 22.Rf2 Qa1 23.Kh3 Ke3
43/57 00:23 417 940k 17 825k -123,03 1. ... Qc6 2.Re4 Qf6 3.Kg1 Kd2 4.Kh2 Qa1 5.Re8 Qa5 6.Re4 Qb5 7.Kg1 Qc5+ 8.Kh2 Kd3 9.Re6 Qd4 10.Re4 Qa1 11.Re6 Qb2 12.Kg1 Qb1+ 13.Kh2 Qa1 14.Re7 Qf6 15.Re1 Qg7 16.Re6 Kd2 17.Re8 Qd4 18.Re6 Qd5 19.Rb6 Ke3 20.Rb1 Qc4 21.Rg1 Qc3 22.h4 gxh4 23.Kh3 Qg7
44/57 00:23 417 940k 17 825k -123,03 1. ... Qc3 2.Re6 Qd4 3.Re4 Qa1 4.Re6 Qb2 5.Kg1 Qb1+ 6.Kh2 Qa1 7.Re7 Qf6 8.Re1 Qg7 9.Re6 Kd2 10.Re8 Qd4 11.Re6 Qd5 12.Re8 Qb5 13.Re7 Qf5 14.Re4 Qf6 15.Re8 Qa1 16.Re6 Qd4 17.Re4 Qc5 18.Re8 Qe3 19.Ra8 Qe5 20.h4 gxh4 21.Ra7 Kd3 22.Ra4 Qg7 23.Kg1 h3 24.Ra2 Qd4+ 25.Kh2
44/57 00:23 417 940k 17 825k -123,03 1. ... Qe3 2.Ra8 Qd4 3.Re8 Qf6 4.Re1 Qg7 5.Re6 Kd2 6.Re8 Qd4 7.Re6 Qd5 8.Re8 Qb5 9.Re7 Qf5 10.Re4 Qf6 11.Re8 Qa1 12.Re6 Qd4 13.Re4 Qc5 14.Re8 Qe3 15.Ra8 Qe5 16.h4 gxh4 17.Ra7 Kd3 18.Ra4 Qg7 19.Kg1 h3 20.Ra2 Qg3 21.Rb2 Qg8 22.Rf2 Qg5 23.Kh1
44/57 00:23 417 940k 17 825k -123,03 1. ... Qc7 2.Re4 Qc5 3.Re6 Qd4 4.Re4 Qa1 5.Re6 Qb2 6.Kg1 Qb1+ 7.Kh2 Qa1 8.Re7 Qf6 9.Re1 Qg7 10.Re6 Kd2 11.Re8 Qd4 12.Re6 Qd5 13.Re8 Qb5 14.Re7 Qf5 15.Re4 Qf6 16.Re8 Qa1 17.Re6 Qd4 18.Re4 Qc5 19.Re8 Qe3 20.Ra8 Qe5 21.h4 gxh4 22.Ra7 Kd3 23.Ra4 Qg7 24.Kg1 h3
44/57 00:23 417 940k 17 825k -123,03 1. ... Qc5 2.Re6 Qd4 3.Re4 Qa1 4.Re6 Qb2 5.Kg1 Qb1+ 6.Kh2 Qa1 7.Re7 Qf6 8.Re1 Qg7 9.Re6 Kd2 10.Re8 Qd4 11.Re6 Qd5 12.Re8 Qb5 13.Re7 Qf5 14.Re4 Qf6 15.Re8 Qa1 16.Re6 Qd4 17.Re4 Qc5 18.Re8 Qe3 19.Ra8 Qe5 20.h4 gxh4 21.Ra7 Kd3 22.Ra4 Qg7 23.Kg1 h3
Conclusion : Not a good test position.
9) Key move e3 ?
e3 is better than other moves. This position seems OK.
37/57 02:37 1 988 064k 12 606k +1,18 1.Bd4 e3 2.Bxe3 Bg2 3.Kb3 Bd5+ 4.Kc3 Ke7 5.Bc5+ Kf7 6.Rd2 Rbc7 7.Bd4 Rb7 8.Ra5 Ke6 9.e3 Kf7 10.Bc5 Rbc7 11.Kb2 Rb7 12.Ka3 Ke6 13.Bd4 Be4 14.Rd1 Kf7 15.Rc1 Re7 16.Ra6 Bf3 17.Rc5 Red7 18.Rcxc6 Bxc6 19.Rxc6 Rbc7 20.Ra6 Re7 21.b5 Rcd7
37/57 02:37 1 988 064k 12 606k +1,25 1.Kb2 e3 2.Kc3 Be4 3.Rb2 Rdc7 4.Bxe3 Bd5 5.Bc5 Rd7 6.Rc2 Ke8 7.Rd2 Kf7 8.e3 Rbc7 9.Kb2 Rb7 10.Ka3 Rbc7 11.Ra5 Ke8 12.Bd4 Be4 13.Rd1 Rb7 14.Rc1 Rdc7 15.Rac5 Rd7 16.Re5+ Kf7 17.Ra5 Re7 18.Ra6 Bf3 19.Rc5 Be4 20.Raa5
38/57 02:37 1 988 064k 12 606k +1,83 1.e3 Rbc7 2.Bd4 Re7 3.Rc5 Red7 4.Kb2 Ke8 5.Kc2 Ke7 6.Kc3 Kf7 7.Rca5 Ba2 8.Kc2 Bc4 9.Rxa7 Rxa7 10.Bxa7 Rd5 11.Rxd5 Bxd5 12.Kc3 Ke6 13.a5 Kd7 14.Bc5 Kc8 15.Kd4 Bb3 16.a6 Ba4 17.Ke5 Bd1 18.Kf6 Kb8 19.Kxg6 Bg4 20.Bd4 Ka8 21.Kg5 Kb8 22.Kf6 Ka8 23.Ke5 Kb8
Conclusion : good key move.
10) Key move Rc7 ?
The key move is for black but the mainline give a win for white.
Note the mainline is full of bad moves.
Conclusion : wrong key move.
Conclusions on positions 1 to 10 :
----------------------------------
1) Not a good test position.
2) Not a good test position.
3) Not a good test position.
4) Not a good test position.
5) Not a good test position.
6) Not a good test position.
7) wrong key move.
8) Not a good test position.
9) good key move.
10) wrong key move.
Only 1 good key move. But the solution is found in less than 1 sec with Stockfish.
So, not a position for a hard set.
Score 0/10.
8/7p/p1pPk1p1/2Pn1pP1/1P1B3P/P4K2/8/8 w - - bm Be5;
4b3/8/1p2pk1p/4p3/1PP1P1PP/3B1K2/8/8 w - - bm b5;
8/2b2k2/p4ppp/1p1p4/1B1P4/1P2P1P1/P4P1P/6K1 b - - bm h5;
8/8/2p1pk2/1b1p3p/1P1PpP1P/4P3/1R3KB1/r7 b - - bm Rc1;
1r4k1/6pp/p7/2Pp4/8/4P3/P5PP/3R2K1 w - - bm Rxd5;
8/8/3k4/3p3n/1P1N1p1P/5K2/8/8 w - - bm Nc2;
2kr3r/pb2n3/1pn1p1pp/2p5/3bNP2/2P3PN/PP3BBP/R1K4R b - - bm Bxf2;
4R3/8/8/6p1/5p2/3k1P1P/6PK/2q5 b - - bm Qe3;
8/pr1r1k2/R1p3p1/2Bb1p1p/PP2pP1P/K5P1/2R1P3/8 w - - bm e3;
5k2/1p3p2/3p1n2/1p1P1N1p/1P1R1P1P/2rB2P1/r1P1K3/8 b - - bm Rc7;
1) Key move Be5 ?
SF-MF gives about the same score for the 5 best moves :
40/90 02:26 2 035 529k 13 939k +10,76 50.Be5 Kf7 51.Ke2 Ke6 52.Kd2 Kf7 53.Kd3 Ke8 54.Ke2 Kf7 55.Kd2 Kf8 56.Bg3 f4 57.Bf2 f3 58.Be3 Ke8 59.Kd3 Kd7 60.Ke4 Nc3+ 61.Kxf3 Nb5 62.Bc1 Nd4+ 63.Ke4 Nc2 64.a4 Nxb4 65.Bd2 Nc2 66.Bc3 Na3 67.Kd3 a5 68.Bb2 Nb5 69.axb5 cxb5 70.Kd4 Kc6 71.Bc3 b4 72.Bxb4 axb4 73.Kc4 h5 74.gxh6 g5 75.h7 gxh4 76.h8Q
40/90 02:26 2 035 529k 13 939k +11,86 50.Ba1 Kf7 51.Be5 Ke6 52.Kf2 Kf7 53.Ke2 Ke6 54.Kd2 Kf7 55.Kd3 Ke8 56.Kd4 Kd7 57.Bg3 Ke6 58.Bh2 Kd7 59.Be5 Ke8 60.Bg3 f4 61.Bf2 Kd8 62.Kd3 Kd7 63.Bd4 Ke6 64.Ke2 Kf7 65.Kf3 Ke6 66.Ke4 Kf7 67.Be5 Ne3 68.Kd3 Nf5 69.Bxf4 Ng7 70.Kd4 Ne6+ 71.Ke5 Nf8 72.a4 Ke8 73.b5 axb5 74.axb5 Nd7+ 75.Kd4 Nb8 76.d7+ Nxd7 77.bxc6 Nf8 78.c7 Kd7 79.c6+ Kc8 80.Kd5 h6
40/90 02:26 2 035 529k 13 939k +12,34 50.Bh8 Kd7 51.Be5 Ke6 52.Kf2 Kf7 53.Ke2 Ke6 54.Kd2 Kf7 55.Kd3 Ke8 56.Ke2 Kf7 57.Kd2 Ke6 58.Bg3 Kf7 59.Kd3 Ke8 60.Kd4 Kd8 61.Ke5 Kd7 62.Bf4 Nc3 63.Bd2 Nd1 64.Kf6 Nf2 65.Kg7 Nd3 66.Kxh7 a5 67.Kxg6 axb4 68.axb4 Ke6 69.h5 f4 70.h6 f3 71.h7 f2 72.h8Q f1Q 73.Qe8+ Kd5 74.d7 Ne5+ 75.Kg7
40/90 02:26 2 035 529k 13 939k +12,34 50.Bb2 Kf7 51.Be5 Ke6 52.Kf2 Kf7 53.Ke2 Ke6 54.Kd2 Kd7 55.Kd3 Ke6 56.Bh2 Kf7 57.Kd4 Ke8 58.Be5 Kd7 59.Bg3 Ke8 60.Ke5 Kd7 61.Bf4 Nc3 62.Bd2 Nd1 63.Kf6 Nf2 64.Kg7 Nd3 65.Kxh7 a5 66.Kxg6 axb4 67.axb4 Ke6 68.h5 f4 69.h6 f3 70.h7 f2 71.h8Q f1Q 72.Qe8+ Kd5
40/90 02:26 2 035 529k 13 939k +12,67 50.Bg7 Kf7 51.Be5 Ke6 52.Kf2 Kf7 53.Ke2 Ke6 54.Kd2 Kf7 55.Kd3 Ke8 56.Kd4 Kd7 57.Bg3 Ke6 58.Bh2 Kd7 59.Be5 Ke8 60.Bg3 Kd8 61.Ke5 Kd7 62.Be1 f4 63.Bf2 Ne3 64.Kxf4 Nf5 65.Ke5 Ng7 66.a4 Ne6 67.Be3 Nd8 68.Kf6 Ke8 69.Kg7 Nf7 70.Kxh7 Ne5 71.Bf2 Kd7 72.Bg3 Nf7 73.Kxg6 Ke6 74.h5 Nh8+ 75.Kg7 Nf7 76.Bf2 Nxg5 77.h6 Kd5 78.h7 Ne6+ 79.Kf7 Nd8+ 80.Kg6
Conclusion : Not a good test position.
2) Key move b5 ?
SF-MF gives about the same score for the 5 best moves :
46/66 07:33 6 369 322k 14 045k +58,65 1.Ke3 Ke7
47/66 07:33 6 369 322k 14 045k +58,72 1.Bf1 Ke7 2.Be2 Bd7 3.Bd3 Be8 4.b5 Kd6 5.h5 Kc5 6.Be2 Kd4 7.Kg3 Bf7 8.g5 Bg8 9.gxh6 Bh7 10.Kg4 Bxe4 11.Kg5 Bf5 12.Bg4 Bh7 13.Kf6 Bc2 14.Be2 Ke3 15.Kxe5 Kxe2 16.h7 Bxh7 17.Kxe6 Bg8+ 18.Kd6 Bxc4 19.h6 Kf3 20.h7 Bd3 21.h8Q Bf5 22.Ke5 Bg6 23.Qh3+ Kf2 24.Qh2+ Ke3 25.Qh6+ Kf3 26.Qf4+ Ke2
47/66 07:33 6 369 322k 14 045k +60,65 1.Kf2 Ke7 2.Kg2 Bd7 3.Kf3 Be8 4.Be2 Bd7 5.Bf1 Be8 6.b5 Kd6 7.h5 Kc5 8.Be2 Kd4 9.Kg3 Bf7 10.g5 Bg8 11.gxh6 Bh7 12.Kg4 Bxe4 13.Kg5 Bf5 14.Bg4 Bh7 15.Kf6 Bc2 16.Be2 Bf5 17.Kg7 Ke3 18.h7 e4 19.h8Q Kxe2 20.h6 e3 21.h7 Kd3 22.Qd8+ Kc2 23.Qxb6 e5 24.Qxe3 Bc8 25.h8Q
47/66 07:33 6 369 322k 14 045k +69,50 1.Be2 Ke7 2.b5 Kd6 3.h5 Bf7 4.g5 Bg8 5.Bd3 Bh7 6.gxh6 Kc5 7.Kg4 Kd4 8.Be2 Bxe4 9.Kg5 Bf5 10.Bg4 Bh7 11.Kf6 Bc2 12.Be2 Ke3 13.Kxe5 Kxe2 14.Kxe6 Bh7 15.c5 Bg8+ 16.Kd6 Bh7 17.cxb6 Kd3 18.Ke6 Kc2 19.Kf6 Kc1 20.b7 Kb1 21.b8Q Bg6 22.hxg6 Kc2 23.h7 Kd3 24.h8Q Kc2 25.g7
47/66 07:33 6 369 322k 14 045k +77,46 1.b5 Ke7 2.c5 bxc5 3.b6 Bc6 4.Bb5 Bb7 5.g5 h5 6.Ke3 Kf7 7.Bc4 Bc8 8.g6+ Kf6 9.g7 Kxg7 10.Bxe6 Bxe6 11.b7 c4 12.b8Q Kf6 13.Qd6 c3 14.Qd8+ Kf7 15.Qc7+ Kf6 16.Qxc3 Bg4 17.Qc7 Ke6 18.Qc5 Kf6 19.Qd6+ Be6 20.Qd8+ Kf7 21.Qb8 Kg6 22.Qe8+ Kf6 23.Qh8+ Kg6 24.Qb8 Bf7 25.Qd6+ Kg7 26.Qxe5+ Kf8 27.Qh8+ Ke7 28.Qb8 Ke6 29.Qc8+ Ke7
Conclusion : Not a good test position.
3) Key move h5 ?
SF-MF gives about the same score for the 5 best moves :
37/44 01:05 896 509k 13 687k +1,05 1. ... Bb6 2.g4 Bc7 3.f3 Ke6 4.Bf8 h5 5.gxh5 gxh5 6.Bc5 f5 7.Kg2 Bd8 8.Kf2 Bh4+ 9.Ke2 Bd8 10.Kd3 Bc7 11.h3 Kf6 12.Ke2 Ke6 13.Bf8 Kf6 14.Bb4 Ke6 15.Bc5 Kf6 16.Kf1 Kf7 17.Kg2 Ke6 18.Kf2 Bd8 19.Kg3 Bc7+ 20.Kh4 f4
38/44 01:05 896 509k 13 687k +1,03 1. ... Kg7 2.g4 f5 3.gxf5 gxf5 4.f3 a5 5.Be1 a4 6.bxa4 bxa4 7.Bg3 Bd8 8.Kf2 Kf7 9.Bf4 h5 10.Bd6 Ke6 11.Bc5 Bc7 12.h3 Kf6 13.Ke2 Ke6 14.Kd3 Bd8 15.Bb4 Bc7 16.Ke2 Bd8 17.Bf8 Bc7 18.Bc5 Bg3 19.Bb4 Bh4 20.Kd3
38/44 01:05 896 509k 13 687k +1,00 1. ... a5 2.Bc5 h5 3.h3 a4 4.bxa4 bxa4 5.Kg2 Ke6 6.Kf3 Bd8 7.Bf8 g5 8.g4 hxg4+ 9.Kxg4 Kf7 10.Bd6 Kg6 11.f4 f5+ 12.Kf3 Kf7 13.fxg5 Bxg5 14.Bg3 Be7 15.Ke2 Kg6 16.Be5 Bd8 17.Bf4 Be7 18.Bg3 Bf6 19.Kf3 Bd8 20.Be5 Bg5 21.Bc7 Be7 22.Bf4 Bd8
38/44 01:05 896 509k 13 687k +1,00 1. ... h5 2.h3 a5 3.Bc5 a4 4.bxa4 bxa4 5.Kg2 Ke6 6.Kf3 Bd8 7.Bf8 g5 8.g4 hxg4+ 9.Kxg4 Kf7 10.Bd6 Kg6 11.f4 f5+ 12.Kf3 Kf7 13.fxg5 Bxg5 14.Bg3 Be7 15.Ke2 Kg6 16.Be5 Bd8 17.Bf4 Be7 18.Bg3 Bf6 19.Kf3 Bd8 20.Be5 Bg5 21.Bc7 Be7 22.Bf4
38/44 01:05 896 509k 13 687k +1,00 1. ... Ke6 2.h3 h5 3.Kg2 a5 4.Bc5 a4 5.bxa4 bxa4 6.Kf3 Bd8 7.Bf8 g5 8.g4 hxg4+ 9.Kxg4 Kf7 10.Bd6 Kg6 11.f4 f5+ 12.Kf3 Kf7 13.fxg5 Bxg5 14.Bg3 Be7 15.Ke2 Kg6 16.Be5 Bd8 17.Bf4 Be7 18.Bg3 Bf6 19.Kf3 Bd8 20.Be5 Bg5 21.Bc7 Be7 22.Bf4 Bd8
Conclusion : Not a good test position.
4) Key move Rc1 ?
SF-MF sees no point for this move, position seems drawish, the winning line given has a bad move 52.Kg3??
SF-MF gives about the same score for the 5 best moves :
41/52 00:25 305 546k 11 885k -0,73 51. ... Rc1 52.Bh3 Bc4 53.Bg2 Bd3 54.Bh3 Ra1 55.Bg2 Bc4 56.Bh3 Ra4 57.Kg3 Ra3 58.Kf2 Ra1 59.Bg2 Ke7 60.Bh3 Rh1 61.Bg2 Rc1 62.Bh3 Kd6 63.Bg2 Bd3 64.Kg3 Re1 65.Kf2 Ra1 66.Kg3 Bf1 67.Kf2 Bb5 68.Bh3 Ra3 69.Bg2 Ba6 70.Bh3 Bd3 71.Bg2 Ra4 72.Kg3 Ra1 73.Kf2 Ra3 74.Kg3
41/52 00:25 305 546k 11 885k -0,73 51. ... Bc4 52.Bh3 Ra4 53.Kg3 Ra3 54.Kf2 Ra1 55.Bg2 Ke7 56.Bh3 Rh1 57.Bg2 Rc1 58.Bh3 Kd6 59.Bg2 Bd3 60.Kg3 Re1 61.Kf2 Ra1 62.Kg3 Bf1 63.Kf2 Bb5 64.Bh3 Ra3 65.Bg2 Ba6 66.Bh3 Bd3 67.Bg2 Ra4 68.Kg3 Ra1 69.Kf2 Ra3 70.Kg3 Bc4 71.Kf2 Ra4 72.Bh3
41/52 00:25 305 546k 11 885k -0,73 51. ... Ra8 52.Bh3 Ra3 53.Bg2 Ra4 54.Bh3 Ra8 55.Rc2 Bc4 56.Rb2 Ra3 57.Bg2 Ra4 58.Bh3 Ra7 59.Bg2 Ra3 60.Bh3 Ra1 61.Bg2 Ke7 62.Bh3 Rh1 63.Bg2 Rc1 64.Bh3 Kd6 65.Bg2 Bd3 66.Kg3 Re1 67.Kf2 Ra1 68.Kg3 Bf1 69.Kf2 Bb5 70.Bh3 Ra3 71.Bg2 Ba6 72.Bh3 Bd3 73.Bg2
41/52 00:25 305 546k 11 885k -0,73 51. ... Ra7 52.Bh3 Ra6 53.Rc2 Ra1 54.Rb2 Ra3 55.Bg2 Ra4 56.Bh3 Ra8 57.Rc2 Bc4 58.Rb2 Ra3 59.Bg2 Ra4 60.Bh3 Ra7 61.Bg2 Ra3 62.Bh3 Ra1 63.Bg2 Ke7 64.Bh3 Rh1 65.Bg2 Rc1 66.Bh3 Kd6 67.Bg2 Bd3 68.Kg3 Re1 69.Kf2 Ra1 70.Kg3 Bf1 71.Kf2 Bb5 72.Bh3 Ra3 73.Bg2
42/52 00:25 305 546k 11 885k -0,73 51. ... Bd3 52.Bh3 Bc4 53.Bg2 Ke7 54.Bh3 Rh1 55.Bg2 Rc1 56.Bh3 Kd6 57.Bg2 Bd3 58.Kg3 Re1 59.Kf2 Ra1 60.Kg3 Bf1 61.Kf2 Bb5 62.Bh3 Ra3 63.Bg2 Ba6 64.Bh3 Bd3 65.Bg2 Ra4 66.Kg3 Ra1 67.Kf2 Ra3 68.Kg3 Bc4 69.Kf2 Ke7 70.Bh3 Kf6 71.Bg2 Ra4 72.Bh3
Conclusion : Not a good test position.
5) Key move Rxd5 ?
Rxd5 seems a bit superior but other moves are winning too :
27/49 00:10 161 886k 15 084k +2,30 24.a4 Rb4 25.Rd4 Rb3 26.Kf2 Ra3 27.Rxd5 Rxa4 28.Ke2 Kf8 29.Kd3 Ra1 30.Kc2 Ra4 31.Kb3 Ra1 32.Rd7 Rc1 33.Kb4 a5+ 34.Kb5 a4 35.Ra7 Ke8 36.Rxa4 Rc2 37.Ra8+ Ke7 38.Ra7+ Kf6 39.g4 Rb2+ 40.Ka6 Ra2+ 41.Kb6 Rb2+ 42.Kc7
27/49 00:10 161 886k 15 084k +2,48 24.Kf1 Rd8 25.Rd4 g6 26.Kf2 Kg7 27.a3 Kf6 28.e4 Rc8 29.Rxd5 Rb8 30.Ke3 Rb1 31.Kd2 Ke6 32.Rd6+ Ke5 33.Rd8 Rb2+ 34.Kd3 Rb1 35.Rd5+ Ke6 36.a4 Rb3+ 37.Kc4 Rb2 38.h4 Rxg2 39.Rd6+ Ke5 40.Rxa6 Kxe4 41.Ra7 Rc2+ 42.Kb5 Kd5 43.Rd7+ Ke6 44.Rxh7
28/49 00:10 161 886k 15 084k +2,74 24.Rxd5 Rb5 25.Kf2 Kf7 26.Rd7+ Kf6 27.c6 Rc5 28.c7 h5 29.Kf3 Rc4 30.Ke2 g5 31.Kd3 Rc1 32.Ke4 Ke6 33.Rg7 g4 34.Kf4 Kf6 35.Rh7 Kg6 36.Rd7 Kf6 37.e4 a5 38.g3 Rf1+ 39.Ke3 Rc1 40.a4 Rc2 41.Kd4 Ke6 42.Rd5 Rxc7 43.Re5+ Kd6 44.Rxa5 h4 45.gxh4 Rc2 46.Rg5 Rd2+ 47.Ke3
Conclusion : Not a good test position.
6) Key move Nc2 ?
3 moves are clearly winning :
33/59 00:36 254 639k 6 973k +39,77 1.Nc2 Nf6 2.Kxf4 d4 3.Kf5 d3 4.Ne3 Nd5 5.Nc4+ Ke7 6.b5 Kd8 7.Ke5 Nb6 8.Nd2 Nc8 9.h5 Ke7 10.Kd4 Kf7 11.Kxd3 Kg7 12.Nc4 Kh6 13.Kd4 Kg5 14.h6 Kxh6 15.Kc5 Kg5 16.Nd6 Nxd6 17.Kxd6 Kh5
34/59 00:36 254 639k 6 973k +77,38 1.Ne2 Nf6 2.b5 Nh5 3.Kg4 f3 4.Kxf3 Nf6 5.Kf4 Kc5 6.Kf5 Ng8 7.Nd4 Ne7+ 8.Kf4 Ng6+ 9.Kg5 Nf8 10.h5 Kc4 11.b6 Kd3 12.Ne6 Nd7 13.Nc5+ Nxc5 14.h6 d4 15.Kg6 Kc3 16.b7 Nxb7 17.h7
34/59 00:36 254 639k 6 973k +77,46 1.Nb3 Nf6 2.b5 Nd7 3.Kxf4 Ke6 4.Kg5 Kf7 5.Nd4 Nb6 6.Kf5 Nc4 7.h5 Na3 8.Kg5 Nc4 9.Nf5 Ne5 10.b6 Ke6 11.b7 Nd7 12.Nd4+ Ke7 13.Nc6+ Kd6 14.Kf5 Kc5 15.Nd4 Nb8 16.Kf4 Nd7 17.b8Q Nxb8 18.Nf5 d4
Conclusion : Not a good test position.
7) Key move Bxf2 ?
The refutation of the move is in the PGN : "2. Nexf2" with an equal position.
SF-MF prefers 1...Bf7 holding the good bishop:
27/42 00:52 559 204k 10 614k -0,01 1. ... Bxf2 2.Nexf2 Kc7 3.Re1 Bc8 4.Ng4 e5 5.Nxe5 Nxe5 6.Rxe5 Nc6 7.Re3 g5 8.b3 Bf5 9.Re2 Bg4 10.Rf2 Rhf8 11.Rf1 Bf5 12.fxg5 Bxh3 13.Bxh3 hxg5 14.Rxf8 Rxf8 15.Kd2 Rf2+ 16.Ke3 Rxh2 17.Bf5 Ne7 18.Be4 Kd6
27/42 00:52 559 204k 10 614k -0,18 1. ... Bg7 2.Kc2 e5 3.Rae1 Kb8 4.Rd1 Kc7 5.Rhe1 Bc8 6.Rxd8 Rxd8 7.Be3 Nd5 8.Bd2 Bf5 9.Kc1 Be6 10.Kc2 a5 11.Nhf2 c4 12.Bh3 Bf5 13.g4 Bxe4+ 14.Rxe4 exf4 15.Bxf4+ Nxf4
Conclusion : wrong key move.
8) Key move Qe3 ?
8 moves are clearly winning :
43/57 00:23 417 940k 17 825k -123,03 1. ... Qb2 2.Kg1 Qc3 3.Re6 Qa1+ 4.Kh2 Qb2 5.Kg1 Qb1+ 6.Kh2 Qa1 7.Re7 Qf6 8.Re1 Qg7 9.Re6 Kd2 10.Re8 Qd4 11.Re6 Qd5 12.Re8 Qb5 13.Re7 Qf5 14.Re4 Qf6 15.Re8 Qa1 16.Re6 Qd4 17.Re4 Qc5 18.Re8 Qe3 19.Ra8 Qe5 20.h4 gxh4 21.Ra7 Ke2 22.Kh3 Qg5 23.Ra2+ Kd3 24.Kh2 Qg3+ 25.Kg1
43/57 00:23 417 940k 17 825k -123,03 1. ... Qc4 2.Re4 Qc5 3.Re6 Qd4 4.Re4 Qa1 5.Re6 Qb2 6.Kg1 Qb1+ 7.Kh2 Qa1 8.Re7 Qf6 9.Re1 Qg7 10.Re6 Kd2 11.Re8 Qd4 12.Re6 Qd5 13.Re8 Qb5 14.Re7 Qf5 15.Re4 Qf6 16.Re8 Qa1 17.Re6 Qd4 18.Re4 Qc5 19.Re8 Qe3 20.Ra8 Qe5 21.h4 gxh4 22.Ra7 Ke2 23.Ra3
43/57 00:23 417 940k 17 825k -123,03 1. ... Qa1 2.Re6 Qb2 3.Kg1 Qb1+ 4.Kh2 Qa1 5.Re7 Qf6 6.Re1 Qg7 7.Re6 Kd2 8.Re8 Qd4 9.Re6 Qd5 10.Re8 Qb5 11.Re7 Qf5 12.Re4 Qf6 13.Re8 Qa1 14.Re6 Qd4 15.Re4 Qc5 16.Re8 Qe3 17.Ra8 Qe5 18.h4 gxh4 19.Ra7 Qe6 20.Rb7 Kd3 21.Rb2 Qe5 22.Rf2 Qa1 23.Kh3 Ke3
43/57 00:23 417 940k 17 825k -123,03 1. ... Qc6 2.Re4 Qf6 3.Kg1 Kd2 4.Kh2 Qa1 5.Re8 Qa5 6.Re4 Qb5 7.Kg1 Qc5+ 8.Kh2 Kd3 9.Re6 Qd4 10.Re4 Qa1 11.Re6 Qb2 12.Kg1 Qb1+ 13.Kh2 Qa1 14.Re7 Qf6 15.Re1 Qg7 16.Re6 Kd2 17.Re8 Qd4 18.Re6 Qd5 19.Rb6 Ke3 20.Rb1 Qc4 21.Rg1 Qc3 22.h4 gxh4 23.Kh3 Qg7
44/57 00:23 417 940k 17 825k -123,03 1. ... Qc3 2.Re6 Qd4 3.Re4 Qa1 4.Re6 Qb2 5.Kg1 Qb1+ 6.Kh2 Qa1 7.Re7 Qf6 8.Re1 Qg7 9.Re6 Kd2 10.Re8 Qd4 11.Re6 Qd5 12.Re8 Qb5 13.Re7 Qf5 14.Re4 Qf6 15.Re8 Qa1 16.Re6 Qd4 17.Re4 Qc5 18.Re8 Qe3 19.Ra8 Qe5 20.h4 gxh4 21.Ra7 Kd3 22.Ra4 Qg7 23.Kg1 h3 24.Ra2 Qd4+ 25.Kh2
44/57 00:23 417 940k 17 825k -123,03 1. ... Qe3 2.Ra8 Qd4 3.Re8 Qf6 4.Re1 Qg7 5.Re6 Kd2 6.Re8 Qd4 7.Re6 Qd5 8.Re8 Qb5 9.Re7 Qf5 10.Re4 Qf6 11.Re8 Qa1 12.Re6 Qd4 13.Re4 Qc5 14.Re8 Qe3 15.Ra8 Qe5 16.h4 gxh4 17.Ra7 Kd3 18.Ra4 Qg7 19.Kg1 h3 20.Ra2 Qg3 21.Rb2 Qg8 22.Rf2 Qg5 23.Kh1
44/57 00:23 417 940k 17 825k -123,03 1. ... Qc7 2.Re4 Qc5 3.Re6 Qd4 4.Re4 Qa1 5.Re6 Qb2 6.Kg1 Qb1+ 7.Kh2 Qa1 8.Re7 Qf6 9.Re1 Qg7 10.Re6 Kd2 11.Re8 Qd4 12.Re6 Qd5 13.Re8 Qb5 14.Re7 Qf5 15.Re4 Qf6 16.Re8 Qa1 17.Re6 Qd4 18.Re4 Qc5 19.Re8 Qe3 20.Ra8 Qe5 21.h4 gxh4 22.Ra7 Kd3 23.Ra4 Qg7 24.Kg1 h3
44/57 00:23 417 940k 17 825k -123,03 1. ... Qc5 2.Re6 Qd4 3.Re4 Qa1 4.Re6 Qb2 5.Kg1 Qb1+ 6.Kh2 Qa1 7.Re7 Qf6 8.Re1 Qg7 9.Re6 Kd2 10.Re8 Qd4 11.Re6 Qd5 12.Re8 Qb5 13.Re7 Qf5 14.Re4 Qf6 15.Re8 Qa1 16.Re6 Qd4 17.Re4 Qc5 18.Re8 Qe3 19.Ra8 Qe5 20.h4 gxh4 21.Ra7 Kd3 22.Ra4 Qg7 23.Kg1 h3
Conclusion : Not a good test position.
9) Key move e3 ?
e3 is better than other moves. This position seems OK.
37/57 02:37 1 988 064k 12 606k +1,18 1.Bd4 e3 2.Bxe3 Bg2 3.Kb3 Bd5+ 4.Kc3 Ke7 5.Bc5+ Kf7 6.Rd2 Rbc7 7.Bd4 Rb7 8.Ra5 Ke6 9.e3 Kf7 10.Bc5 Rbc7 11.Kb2 Rb7 12.Ka3 Ke6 13.Bd4 Be4 14.Rd1 Kf7 15.Rc1 Re7 16.Ra6 Bf3 17.Rc5 Red7 18.Rcxc6 Bxc6 19.Rxc6 Rbc7 20.Ra6 Re7 21.b5 Rcd7
37/57 02:37 1 988 064k 12 606k +1,25 1.Kb2 e3 2.Kc3 Be4 3.Rb2 Rdc7 4.Bxe3 Bd5 5.Bc5 Rd7 6.Rc2 Ke8 7.Rd2 Kf7 8.e3 Rbc7 9.Kb2 Rb7 10.Ka3 Rbc7 11.Ra5 Ke8 12.Bd4 Be4 13.Rd1 Rb7 14.Rc1 Rdc7 15.Rac5 Rd7 16.Re5+ Kf7 17.Ra5 Re7 18.Ra6 Bf3 19.Rc5 Be4 20.Raa5
38/57 02:37 1 988 064k 12 606k +1,83 1.e3 Rbc7 2.Bd4 Re7 3.Rc5 Red7 4.Kb2 Ke8 5.Kc2 Ke7 6.Kc3 Kf7 7.Rca5 Ba2 8.Kc2 Bc4 9.Rxa7 Rxa7 10.Bxa7 Rd5 11.Rxd5 Bxd5 12.Kc3 Ke6 13.a5 Kd7 14.Bc5 Kc8 15.Kd4 Bb3 16.a6 Ba4 17.Ke5 Bd1 18.Kf6 Kb8 19.Kxg6 Bg4 20.Bd4 Ka8 21.Kg5 Kb8 22.Kf6 Ka8 23.Ke5 Kb8
Conclusion : good key move.
10) Key move Rc7 ?
The key move is for black but the mainline give a win for white.
Note the mainline is full of bad moves.
Conclusion : wrong key move.
Conclusions on positions 1 to 10 :
----------------------------------
1) Not a good test position.
2) Not a good test position.
3) Not a good test position.
4) Not a good test position.
5) Not a good test position.
6) Not a good test position.
7) wrong key move.
8) Not a good test position.
9) good key move.
10) wrong key move.
Only 1 good key move. But the solution is found in less than 1 sec with Stockfish.
So, not a position for a hard set.
Score 0/10.
-
Vinvin
- Posts: 5334
- Joined: Thu Mar 09, 2006 9:40 am
- Full name: Vincent Lejeune
Re: Debugging a supposed hard set. Positions 11 to 20.
r1r3k1/p3bppp/1p2pn2/8/2PN1B2/1P3KP1/P4P1P/3R1R2 w - - bm g4;
3r4/1p3k2/p5pp/5n2/5P2/P1B2K2/1P3P1P/4R3 w - - bm Be5;
8/8/5kp1/8/8/6P1/1b4KP/8 w - - bm Kf3;
6k1/p2n1ppp/1p6/3p4/3P4/P7/1P3PPP/2B3K1 w - - bm Kf1;
8/1p1b4/3P4/2PkPp1p/p4K1P/8/8/2B5 b - - bm Kd4;
7k/4R3/7P/8/3rP1p1/3p4/3K1P2/8 w - - bm Re8+;
4R1nk/5rpp/8/3p1n1N/p1pP4/PpP2P2/1B4PP/6K1 b - - bm Re7;
8/p4p2/3k1r2/1p1p1b2/n1pP1N2/2P1R1P1/2P5/R5K1 w - - bm Nxd5;
4n3/6pp/1pk2p2/1p1p4/p2P4/P2KP3/NP3PPP/8 w - - bm f3;
2r5/8/4k1p1/6Pp/2p1PK1P/2R5/8/8 w - - bm Ke3;
11) Key move g4 ?
There's no point for this move.
Mainline in the PGN is : 1. g4 a6 2. g5 Ne8
SF sees that 2...Ne8 is bad and play 2...Nh5 3. Be3 g6 with an equal score of 0.24.
Conclusion : Wrong key move.
12) Key move Be5 ?
This move has no point. White has a good position but the PGN give 1/2 at the end.
A lot of moves are at least equal.
Conclusion : Wrong key move.
13) Key move Kf3 ?
It's a 6 pcs TB position, a lot of moves are draw.
Conclusion : Wrong key move.
14) Key move Kf1 ?
It's white to play, the PGN gives 0-1. Find a move to lose ?
Conclusion : Wrong key move.
15) Key move Kd4 ?
Multiple solutions. 6 best moves are 0.00 :
37/28 01:14 85 081k 1 149k 0,00 53. ... Bc8 54.Ba3 Be6 55.Bb4 Bc8 56.Ba3
37/28 01:14 85 081k 1 149k 0,00 53. ... Be6 54.Ba3 Kd4 55.Bb4 Bc8 56.Ba3 Kd5 57.Bc1 Bd7 58.Ba3 Be6 59.Bb4 Bc8 60.Ba3 Be6
37/28 01:14 85 081k 1 149k 0,00 53. ... Kc6 54.Kg5 f4 55.Kxf4 Kxc5 56.Kg5 Kd5 57.Kf6 Be6 58.Ke7 Kxe5 59.d7 Bxd7 60.Kxd7 b5 61.Kc6 b4 62.Kc5 a3 63.Kc4 a2
37/28 01:14 85 081k 1 149k 0,00 53. ... Kd4 54.Be3+ Kc3 55.Bc1 Kc2 56.Ba3 Kb3 57.Bc1 a3 58.Bxa3 Kxa3 59.Kg5 Kb4 60.Kf6 f4 61.e6 Bxe6 62.Kxe6 f3 63.d7 f2
38/28 01:14 85 081k 1 149k 0,00 53. ... Ke6 54.Ba3 Bc8 55.Bb4 Kd5 56.Ba3 Be6 57.Bb4 Bc8
38/28 01:14 85 081k 1 149k 0,00 53. ... Kxc5 54.Kg5 Kd5 55.Kxh5 Kxe5 56.Kg5 Kxd6 57.h5 Ke6 58.h6 Kf7 59.Bb2 Kg8 60.Kg6 Be8+ 61.Kxf5 Kh7 62.Ke6 Bc6 63.Kd6 Kg8 64.Kc5 Be8 65.Kb4 a3 66.Bxa3
Conclusion : Not a good test position.
16) Key move Re8+ ?
3 moves are completely winning but not Re8+.
44/60 02:30 204 572k 1 363k +123,33 60.Ke1 d2+ 61.Kd1 Rd6 62.Rg7 Rd8 63.Rxg4 Rd4 64.Rh4 Kh7 65.f3 Ra4 66.Kxd2 Ra3 67.f4 Ra2+ 68.Ke3 Ra3+ 69.Kd4 Ra4+ 70.Ke5 Ra5+ 71.Ke6 Ra6+ 72.Kf5 Ra8 73.Rg4 Rf8+ 74.Ke5 Re8+ 75.Kd4 Rd8+ 76.Ke3 Rd1 77.f5 Re1+ 78.Kd4
44/60 02:30 204 572k 1 363k +123,34 60.Kd1 Rd6 61.Rg7 d2 62.Rxg4 Rd4 63.Rh4 Kh7 64.f3 Ra4 65.Kxd2 Ra3 66.f4 Ra2+ 67.Ke3 Ra3+ 68.Kd4 Ra4+ 69.Ke5 Ra5+ 70.Ke6 Ra6+ 71.Kf5 Ra8 72.Rg4 Rf8+ 73.Ke5 Re8+ 74.Kd4 Rd8+ 75.Ke3 Rd1 76.f5 Re1+ 77.Kd4 Ra1 78.f6 Ra4+
44/60 02:30 204 572k 1 363k +123,41 60.e5 Rd5 61.e6 Rd6 62.Re8+ Kh7 63.e7 Re6 64.Kxd3 Re1 65.Kd4 Re6 66.Kd5 Re2 67.Kd6 Rd2+ 68.Ke5 Re2+ 69.Kf4 Rxf2+ 70.Ke3 Rf3+ 71.Ke4 Rf2 72.Rh8+ Kg6 73.e8Q+ Kg5 74.Rg8+ Kh4 75.Rxg4+
Conclusion : Wrong key move.
17) Key move Re7 ?
g6 seems stronger than Re7 :
40/54 00:33 70 311k 2 074k -1,51 1. ... Re7 2.Rxe7 Ngxe7 3.Kf2 Kg8 4.g4 Nd6 5.Nf4 Kf7 6.h4 Ne8 7.Ng2 Nc7 8.Ne3 g6 9.Bc1 Nb5 10.Nd1 Ke6 11.Ke2 Kd7 12.Ke3
40/54 00:33 70 311k 2 074k -2,97 1. ... g6 2.Ng3 Nxg3 3.hxg3 Re7 4.Rxe7 Nxe7 5.Kf2 h5 6.g4 hxg4 7.fxg4 Kg7 8.Kf3 Nc8 9.Kg3 Kf6 10.Kf2 Nd6 11.Kf3 Ne4 12.g3
But, May be a fortress ?
Conclusion : Need more investigation.
18) Key move Nxd5 ?
No point for this move.
mainline is buggy : 7.Ra6?? -> 7.Kf2 is winning (+44 score)
Conclusion : Wrong key move.
19) Key move f3 ?
1.g4 is very close to 1.f3
Stockfish fins a lot of improvement in the mainline.
Conclusion : Not a good test position.
20) Key move Ke3 ?
Simply a drawish endgame.
5 first moves are draw by transposition :
48/33 01:35 840 770k 8 775k 0,00 40.Rc1 c3 41.Ke3 Ke5 42.Kd3 Rd8+ 43.Kc2 Kf4 44.e5 Kg3 45.Rd1 Re8 46.Rd6 Kxh4 47.Rxg6 Rxe5 48.Kxc3
48/33 01:35 840 770k 8 775k 0,00 40.Rc2 Kd6 41.Ke3 Kc5 42.Rc1 Rd8 43.Kf4 Rf8+ 44.Ke5 Rc8 45.Ke6 Rc6+ 46.Ke5 Ra6 47.Rc2 Rb6 48.Rc1 Ra6
48/33 01:35 840 770k 8 775k 0,00 40.Ra3 c3 41.Ra6+ Kd7 42.Ra1 Kd6 43.Ke3 Ke5 44.Ra5+ Ke6 45.Ra6+ Kf7 46.Ra7+ Kf8 47.Ra1 c2 48.Rf1+ Ke7
49/33 01:35 840 770k 8 775k 0,00 40.Ke3 Ke5 41.Rc2 Kd6 42.Kd4 Ke6 43.Rc3 Rd8+ 44.Kxc4 Ke5 45.Re3 Rc8+ 46.Kd3 Rd8+ 47.Kc3 Kf4 48.Rd3 Rc8+ 49.Kd4
49/33 01:35 840 770k 8 775k 0,00 40.Kf3 Kd6 41.Rc1 Ke5 42.Ke3 c3 43.Kd3 Rd8+ 44.Kc2 Kf4 45.e5 Kg3 46.Rd1 Re8 47.Rd6 Kxh4 48.Rxg6 Rxe5 49.Kxc3
Conclusion : Not a good test position.
Conclusions on positions 11 to 10 :
------------------------------------
11) Wrong key move.
12) Wrong key move.
13) Wrong key move.
14) Wrong key move.
15) Not a good test position.
16) Wrong key move.
17) Need more investigation.
18) Wrong key move.
19) Not a good test position.
20) Not a good test position.
9 bad positions, 1 need more investigation.
3r4/1p3k2/p5pp/5n2/5P2/P1B2K2/1P3P1P/4R3 w - - bm Be5;
8/8/5kp1/8/8/6P1/1b4KP/8 w - - bm Kf3;
6k1/p2n1ppp/1p6/3p4/3P4/P7/1P3PPP/2B3K1 w - - bm Kf1;
8/1p1b4/3P4/2PkPp1p/p4K1P/8/8/2B5 b - - bm Kd4;
7k/4R3/7P/8/3rP1p1/3p4/3K1P2/8 w - - bm Re8+;
4R1nk/5rpp/8/3p1n1N/p1pP4/PpP2P2/1B4PP/6K1 b - - bm Re7;
8/p4p2/3k1r2/1p1p1b2/n1pP1N2/2P1R1P1/2P5/R5K1 w - - bm Nxd5;
4n3/6pp/1pk2p2/1p1p4/p2P4/P2KP3/NP3PPP/8 w - - bm f3;
2r5/8/4k1p1/6Pp/2p1PK1P/2R5/8/8 w - - bm Ke3;
11) Key move g4 ?
There's no point for this move.
Mainline in the PGN is : 1. g4 a6 2. g5 Ne8
SF sees that 2...Ne8 is bad and play 2...Nh5 3. Be3 g6 with an equal score of 0.24.
Conclusion : Wrong key move.
12) Key move Be5 ?
This move has no point. White has a good position but the PGN give 1/2 at the end.
A lot of moves are at least equal.
Conclusion : Wrong key move.
13) Key move Kf3 ?
It's a 6 pcs TB position, a lot of moves are draw.
Conclusion : Wrong key move.
14) Key move Kf1 ?
It's white to play, the PGN gives 0-1. Find a move to lose ?
Conclusion : Wrong key move.
15) Key move Kd4 ?
Multiple solutions. 6 best moves are 0.00 :
37/28 01:14 85 081k 1 149k 0,00 53. ... Bc8 54.Ba3 Be6 55.Bb4 Bc8 56.Ba3
37/28 01:14 85 081k 1 149k 0,00 53. ... Be6 54.Ba3 Kd4 55.Bb4 Bc8 56.Ba3 Kd5 57.Bc1 Bd7 58.Ba3 Be6 59.Bb4 Bc8 60.Ba3 Be6
37/28 01:14 85 081k 1 149k 0,00 53. ... Kc6 54.Kg5 f4 55.Kxf4 Kxc5 56.Kg5 Kd5 57.Kf6 Be6 58.Ke7 Kxe5 59.d7 Bxd7 60.Kxd7 b5 61.Kc6 b4 62.Kc5 a3 63.Kc4 a2
37/28 01:14 85 081k 1 149k 0,00 53. ... Kd4 54.Be3+ Kc3 55.Bc1 Kc2 56.Ba3 Kb3 57.Bc1 a3 58.Bxa3 Kxa3 59.Kg5 Kb4 60.Kf6 f4 61.e6 Bxe6 62.Kxe6 f3 63.d7 f2
38/28 01:14 85 081k 1 149k 0,00 53. ... Ke6 54.Ba3 Bc8 55.Bb4 Kd5 56.Ba3 Be6 57.Bb4 Bc8
38/28 01:14 85 081k 1 149k 0,00 53. ... Kxc5 54.Kg5 Kd5 55.Kxh5 Kxe5 56.Kg5 Kxd6 57.h5 Ke6 58.h6 Kf7 59.Bb2 Kg8 60.Kg6 Be8+ 61.Kxf5 Kh7 62.Ke6 Bc6 63.Kd6 Kg8 64.Kc5 Be8 65.Kb4 a3 66.Bxa3
Conclusion : Not a good test position.
16) Key move Re8+ ?
3 moves are completely winning but not Re8+.
44/60 02:30 204 572k 1 363k +123,33 60.Ke1 d2+ 61.Kd1 Rd6 62.Rg7 Rd8 63.Rxg4 Rd4 64.Rh4 Kh7 65.f3 Ra4 66.Kxd2 Ra3 67.f4 Ra2+ 68.Ke3 Ra3+ 69.Kd4 Ra4+ 70.Ke5 Ra5+ 71.Ke6 Ra6+ 72.Kf5 Ra8 73.Rg4 Rf8+ 74.Ke5 Re8+ 75.Kd4 Rd8+ 76.Ke3 Rd1 77.f5 Re1+ 78.Kd4
44/60 02:30 204 572k 1 363k +123,34 60.Kd1 Rd6 61.Rg7 d2 62.Rxg4 Rd4 63.Rh4 Kh7 64.f3 Ra4 65.Kxd2 Ra3 66.f4 Ra2+ 67.Ke3 Ra3+ 68.Kd4 Ra4+ 69.Ke5 Ra5+ 70.Ke6 Ra6+ 71.Kf5 Ra8 72.Rg4 Rf8+ 73.Ke5 Re8+ 74.Kd4 Rd8+ 75.Ke3 Rd1 76.f5 Re1+ 77.Kd4 Ra1 78.f6 Ra4+
44/60 02:30 204 572k 1 363k +123,41 60.e5 Rd5 61.e6 Rd6 62.Re8+ Kh7 63.e7 Re6 64.Kxd3 Re1 65.Kd4 Re6 66.Kd5 Re2 67.Kd6 Rd2+ 68.Ke5 Re2+ 69.Kf4 Rxf2+ 70.Ke3 Rf3+ 71.Ke4 Rf2 72.Rh8+ Kg6 73.e8Q+ Kg5 74.Rg8+ Kh4 75.Rxg4+
Conclusion : Wrong key move.
17) Key move Re7 ?
g6 seems stronger than Re7 :
40/54 00:33 70 311k 2 074k -1,51 1. ... Re7 2.Rxe7 Ngxe7 3.Kf2 Kg8 4.g4 Nd6 5.Nf4 Kf7 6.h4 Ne8 7.Ng2 Nc7 8.Ne3 g6 9.Bc1 Nb5 10.Nd1 Ke6 11.Ke2 Kd7 12.Ke3
40/54 00:33 70 311k 2 074k -2,97 1. ... g6 2.Ng3 Nxg3 3.hxg3 Re7 4.Rxe7 Nxe7 5.Kf2 h5 6.g4 hxg4 7.fxg4 Kg7 8.Kf3 Nc8 9.Kg3 Kf6 10.Kf2 Nd6 11.Kf3 Ne4 12.g3
But, May be a fortress ?
Conclusion : Need more investigation.
18) Key move Nxd5 ?
No point for this move.
mainline is buggy : 7.Ra6?? -> 7.Kf2 is winning (+44 score)
Conclusion : Wrong key move.
19) Key move f3 ?
1.g4 is very close to 1.f3
Stockfish fins a lot of improvement in the mainline.
Conclusion : Not a good test position.
20) Key move Ke3 ?
Simply a drawish endgame.
5 first moves are draw by transposition :
48/33 01:35 840 770k 8 775k 0,00 40.Rc1 c3 41.Ke3 Ke5 42.Kd3 Rd8+ 43.Kc2 Kf4 44.e5 Kg3 45.Rd1 Re8 46.Rd6 Kxh4 47.Rxg6 Rxe5 48.Kxc3
48/33 01:35 840 770k 8 775k 0,00 40.Rc2 Kd6 41.Ke3 Kc5 42.Rc1 Rd8 43.Kf4 Rf8+ 44.Ke5 Rc8 45.Ke6 Rc6+ 46.Ke5 Ra6 47.Rc2 Rb6 48.Rc1 Ra6
48/33 01:35 840 770k 8 775k 0,00 40.Ra3 c3 41.Ra6+ Kd7 42.Ra1 Kd6 43.Ke3 Ke5 44.Ra5+ Ke6 45.Ra6+ Kf7 46.Ra7+ Kf8 47.Ra1 c2 48.Rf1+ Ke7
49/33 01:35 840 770k 8 775k 0,00 40.Ke3 Ke5 41.Rc2 Kd6 42.Kd4 Ke6 43.Rc3 Rd8+ 44.Kxc4 Ke5 45.Re3 Rc8+ 46.Kd3 Rd8+ 47.Kc3 Kf4 48.Rd3 Rc8+ 49.Kd4
49/33 01:35 840 770k 8 775k 0,00 40.Kf3 Kd6 41.Rc1 Ke5 42.Ke3 c3 43.Kd3 Rd8+ 44.Kc2 Kf4 45.e5 Kg3 46.Rd1 Re8 47.Rd6 Kxh4 48.Rxg6 Rxe5 49.Kxc3
Conclusion : Not a good test position.
Conclusions on positions 11 to 10 :
------------------------------------
11) Wrong key move.
12) Wrong key move.
13) Wrong key move.
14) Wrong key move.
15) Not a good test position.
16) Wrong key move.
17) Need more investigation.
18) Wrong key move.
19) Not a good test position.
20) Not a good test position.
9 bad positions, 1 need more investigation.
-
Vinvin
- Posts: 5334
- Joined: Thu Mar 09, 2006 9:40 am
- Full name: Vincent Lejeune
Re: Debugging a supposed hard set. Positions 21 to 30.
2k5/1pq3pp/p1b1p3/3p4/3PprP1/2P4P/2PQ1P2/R3R1K1 w - - bm Re3;
8/5p2/1p3kp1/1P1q3p/3P1K2/7P/1Q4P1/8 b - - bm Ke6;
5k2/1p1n1ppp/p2p1n2/3Pp3/4P3/P4P2/1P2B1PP/2B3K1 w - - bm Kf2;
r3rnk1/1p1n1pp1/p1p3p1/3p2b1/N2P4/1N2P2P/PP3PPB/2R1R1K1 b - - bm Ne6;
2r1bk2/pp4pp/2nR4/8/4P3/5P2/PP4PP/3R2K1 b - - bm Ne5;
r2r2k1/p5bp/1p2p1p1/2p1p3/4N3/2P1P2P/PP3PP1/R4RK1 w - - bm Rfd1;
8/8/7K/8/p1p5/2Bp4/pn1N4/k3N3 w - - bm Nxd3;
1k1r4/1p6/p1prnp2/P3p1p1/1PP1P2p/5P2/2R1NKPP/1R6 b - - bm Rd2;
3r3r/ppp1bk1p/5p2/6p1/3p2b1/P2P4/1PPNNPPP/R3R1K1 b - - bm c5;
21) Key move Re3 ?
It's white to play but mainline gives black winning.
Nonsense.
Conclusion : Not a good test position.
22) Key move Ke6 ?
No point for this move. It's a drawish position.
There's 2 blunders in the pgn : 59.Kh2? and 61.Ke2??
Conclusion : Not a good test position.
23) Key move Kf2 ?
It's white to play but mainline gives black winning.
Nonsense.
Conclusion : Not a good test position.
24) Key move Ne6 ?
It's black to play but mainline gives white winning.
Nonsense.
Conclusion : Not a good test position.
25) Key move Ne5
A lot of moves have no point in the mainline. It's a drawish position.
Even the latest position (0-1??) is draw !
Nonsense.
Conclusion : Not a good test position.
26) Key move Rfd1 ?
A lot of moves hold the advantage for white :
49/70 1:36:41 74 415 678k 12 828k +1,14 1.b3 h5 2.Rfd1 Kf7 3.Kf1 Bf8 4.Ke2 Be7 5.Rab1 Rac8 6.Rxd8 Rxd8 7.c4 g5 8.g4 h4 9.Rd1 Rxd1 10.Kxd1 Ke8 11.Nc3 Bd6 12.Nb5 Bb8 13.Kc2 Kf7 14.Nc3 Bd6 15.Kd3 Ke8 16.Ne4 Be7 17.Nd2 Kf7 18.Ke4 Bd6 19.Kf3 Bf8 20.Ne4 Be7 21.Ke2 Kg6 22.Kd1 Kf7 23.Kd2 Kg6 24.Kd3 Kf7 25.Nc3 Bd6 26.Kd2
49/70 1:36:41 74 415 678k 12 828k +1,14 1.Rfd1 Kf7 2.Kf1 Rab8 3.Rxd8 Rxd8 4.c4 Bf8 5.Re1 Ke7 6.Ke2 Ke8 7.Rd1 Rxd1 8.Kxd1 Be7 9.b3 g5 10.Kd2 Kf7 11.Kd3 Kg6 12.Ng3 h5 13.Ke4 Bd6 14.Kf3 Be7 15.Ne4 Kf5 16.g4+ hxg4+ 17.hxg4+ Kg6 18.Ke2 Kf7 19.Kd3 Kg6 20.Nc3 Bd6 21.Kc2 Bb8 22.Ne4 Bc7 23.Kd3 Bd8 24.Nd2 Be7 25.Ke2 Kf7 26.Ne4 Kg6 27.Kd1 Kf7 28.Kc2 Kg6 29.Kd2
49/70 1:36:41 74 415 678k 12 828k +1,21 1.c4 Kf7 2.Rfd1 Bf6 3.Rab1 h5 4.Kf1 Be7 5.Ke2 Rxd1 6.Rxd1 Rd8 7.Rxd8 Bxd8 8.Nd6+ Kg7 9.Kf3 a6 10.Ne4 Be7 11.Nd2 Kf6 12.Ke4 Bd6 13.Nf3 Bb8 14.b3 Bd6 15.g4 hxg4 16.hxg4 g5 17.Kd3 Bc7 18.Nd2 Kf7 19.Ne4 Bd8 20.Kc2 Be7 21.Kc3 Ke8 22.Nd2 Bf6 23.Kd3 Kd7 24.Ke2 b5 25.Ne4 Be7 26.Kd3 Kc6
49/70 1:36:41 74 415 678k 12 828k +1,21 1.Rad1 Kf8 2.c4 Kf7 3.Rxd8 Rxd8 4.Rc1 Rd7 5.Kf1 Bf6 6.Ke2 h5 7.Rc3 Be7 8.Ra3 Ke8 9.Nd2 Bh4 10.g3 Bd8 11.Rd3 Rb7 12.h4 Be7 13.Ne4 Rc7 14.Kf3 Rd7 15.Rxd7 Kxd7 16.Ng5 Bf6 17.Ke4 Ke7 18.Nf3 Kd6 19.b3 Bg7 20.Ng5 Ke7 21.Kf3 Bf6 22.Ne4 Bg7 23.Ke2 Bh6 24.Kd3 Kd7 25.Kc3 Bg7 26.Kc2 a6 27.Kd3 Kc6 28.Ng5
Conclusion : Not a good test position.
27) Key move Nxd3 ?
Yes, the only good move, mate in 13.
Found in 4 seconds.
Conclusion : Good move but easy.
28) Key move Rd2 ?
A lot of moves hold the advantage for white :
33/59 03:06 2 124 984k 11 373k -0,96 39. ... g4 40.fxg4 Ng5 41.Rbc1 Rd3 42.Nc3 h3 43.Kf1 hxg2+ 44.Rxg2 Rh8 45.Kg1 Rd4 46.b5 Rh3 47.Ne2 Rxe4 48.bxc6 bxc6 49.Rf1 Rh6 50.Ng3 Rxg4 51.Nf5 Nh3+ 52.Kh1 Rhg6 53.Rxg4 Rxg4 54.Ng3 Rxc4 55.Rxf6 Nf4 56.h4 Kc7 57.Rf5 Kd6 58.h5 Rc1+ 59.Kh2
33/59 03:06 2 124 984k 11 373k -1,01 39. ... Kc7 40.Ke1 h3 41.gxh3 Rh8 42.Ng1 Rd3 43.Kf2 Rh4 44.Kf1 Rh7 45.Kg2 Nf4+ 46.Kg3 Rh4 47.Rbb2 Rd1 48.Ne2 Rxh3+ 49.Kg4 Rxh2 50.Kf5 Nd3 51.Nf4 Rxc2 52.Ne6+ Kb8 53.Rxc2 Rf1 54.Kxf6 g4 55.Rg2 gxf3 56.Rd2 Nxb4 57.Kxe5 Re1 58.Nc5 Re2 59.Rd7
33/59 03:06 2 124 984k 11 373k -1,14 39. ... Rd3 40.h3 Rd1 41.Rcb2 Kc7 42.c5 R1d3 43.Ke1 Kd7 44.Nc1 Re3+ 45.Re2 Ra3 46.Rd2+ Ke7 47.Rxd8 Kxd8 48.Rb3 Ra1 49.Kd2 Ke7 50.Kd1 Ke8 51.Kd2 Kf7 52.Kd1 Kg6 53.Kd2 Nf4 54.Kc2 Nxg2 55.Rc3 Nf4 56.Kb2 Rxc1 57.Rxc1 Nd3+ 58.Kb1 Nxc1 59.Kxc1 f5 60.Kd2 f4
33/59 03:06 2 124 984k 11 373k -1,27 39. ... Rd2 40.Rbb2 Rxc2 41.Rxc2 Rd3 42.Rb2 Kc7 43.c5 Kd7 44.Nc1 Rd1 45.Ne2 Ke7 46.Nc3 Rd4 47.Ke3 Nf4 48.Ne2 Rd3+ 49.Kf2 Ne6 50.Nc1 Rd1 51.Ne2 Rh1 52.h3 Rd1 53.Nc3 Rd4 54.g3 Rd3 55.Ne2 Nd4 56.Nxd4 exd4 57.gxh4 gxh4 58.Rb1 Ke6 59.Rg1 Ke5 60.Rg4 Rd2+ 61.Ke1 Rb2 62.Kd1 Rxb4 63.Rxh4
Probably not crucial to win but appears to be the best move.
Stockfish prefer g4 for a long time.
Note there's a very bad move in the mainline in the PGN : 45.hxg3?? score goes from -1 to -2.50 , 45.Kxg3 is way better !
Conclusion : May be the first hard position ? But still dubious because of lot close winning moves.
29) Key move c5 ?
c5 has nothing special, other moves hold the advantage for black.
26/43 03:54 2 403 803k 10 270k -0,41 1. ... Be6 2.Ng3 h5 3.Re2 h4 4.Rae1 hxg3 5.Rxe6 gxh2+ 6.Kh1 Rd7 7.Nc4 c6 8.g3 Bc5 9.R1e2 Rh3 10.Re8 Rc7 11.R8e6 Be7 12.R2e4 Rh8 13.Re2 g4 14.Re1 Rd7 15.R6e4
26/43 03:54 2 403 803k 10 270k -0,43 1. ... b6 2.h3 Bc8 3.b4 Be6 4.b5 Rhe8 5.f4 g4 6.hxg4 Bxg4 7.Nb3 Bd6 8.Nexd4 Bxf4 9.Nc6 Ra8 10.a4 h5 11.Nbd4 Be3+ 12.Kh2 a6 13.bxa6 Rxa6 14.Nb5 Bd7 15.Rxe3 Rxe3
26/43 03:54 2 403 803k 10 270k -0,46 1. ... c5 2.a4 b6 3.Nc4 Be6 4.f4 h6 5.b3 Bd5 6.Kf2 Rhg8 7.fxg5 hxg5 8.Ng3 Rh8 9.h3 Rd7 10.Ne4 Rh4 11.Ned2 Rd8 12.Nf3 Rf4 13.Ncd2 Bd6 14.Ne4
26/43 03:54 2 403 803k 10 270k -0,52 1. ... Rhe8 2.b4 Be6 3.Ng3 Bf8 4.Nb3 b6 5.b5 Kg6 6.Re2 h5 7.Rae1 Bd7 8.Rxe8 Rxe8 9.Rxe8 Bxe8 10.a4 c5 11.bxc6 Bxc6 12.a5 bxa5 13.Nxa5 Bd5 14.Nb3 Bxb3 15.cxb3 Bd6 16.Ne2
26/43 03:54 2 403 803k 10 270k -0,56 1. ... Rd5 2.Ng3 h5 3.Re4 f5 4.Ree1 h4 5.Ngf1 Bf6 6.a4 Bh5 7.Nc4 Kg7 8.Nfd2 Rdd8 9.f3 Bf7 10.Kf2 Rhe8 11.b4 Kg6 12.b5 a6 13.bxa6 bxa6 14.Rab1 Bd5 15.Na5
Lines in the PGN are full of bad moves, it's certainly not the best way to play for the win.
Conclusion : Not a good test position.
30) Key move Kd3 ?
SF prefers 1.b4 over 1.Kd3 at depth 40/78, there's no lines in the PGN to show the relevance of 1.Kd3 .
40/78 14:44 11 048 997k 12 495k +2,28 1.Kd3 Nd8 2.Ke4 Nb7 3.f4 gxf4 4.exf4 exf4 5.Kd5 Kd7 6.Re1 Rc7 7.Re6 Nd8 8.Rxf6 f3 9.Rf8 f2 10.Ne3 h6 11.Rxf2 Rc6 12.g5 Rd6+ 13.Ke4 Re6+ 14.Kd3 hxg5 15.Ng4 Ke7 16.h6 Nf7 17.h7 Rd6+ 18.Ke4 Nh8 19.Ne3 Re6+ 20.Kd3 Ke8 21.Nd5 Re1 22.Rf6 Rh1 23.Rxb6 Nf7 24.Ra6 Rh3+ 25.Ke4 Kf8 26.Rxa5 Rxb3 27.Ne3 Kg7 28.Ra7 Rb8 29.Kf5 Rh8 30.Ng4 Rxh7 31.Ne5
40/78 14:44 11 048 997k 12 495k +2,76 1.b4 cxb4+ 2.axb4 Nc7 3.Kb3 Na6 4.bxa5 bxa5 5.Ka4 Rc5 6.Rd6 Nb8 7.Kb3 Nd7 8.Ra6 Kd8 9.Ng3 Kc8 10.Ne4 Kb7 11.Re6 Rc8 12.h6 Kc7 13.Re7 Kc6 14.Rxh7 Rf8 15.Kc3 Nc5 16.Nxc5 Kxc5 17.Rc7+ Kb6 18.Re7 Kc5 19.h7 Rh8 20.Rc7+ Kd6 21.Rf7 Kc5 22.Rxf6 Rxh7 23.Re6 Rh2 24.Rxe5+ Kb6 25.f4 gxf4 26.exf4 Rh3+ 27.Kd4 Rh4 28.Rb5+ Ka6 29.Rg5 a4 30.Kc3 a3 31.Kb4 Kb7
I'll stay with 1.b4 as the best move.
Conclusion : Wrong key move.
Conclusions on positions 21 to 30 :
------------------------------------
21) Not a good test position.
22) Not a good test position.
23) Not a good test position.
24) Not a good test position.
25) Not a good test position.
26) Not a good test position.
27) Good move but easy.
28) May be the first hard position ? But still dubious because of lot close moves in eval.
29) Not a good test position.
30) Wrong key move.
For me there's not only one interesting position on 10.
8/5p2/1p3kp1/1P1q3p/3P1K2/7P/1Q4P1/8 b - - bm Ke6;
5k2/1p1n1ppp/p2p1n2/3Pp3/4P3/P4P2/1P2B1PP/2B3K1 w - - bm Kf2;
r3rnk1/1p1n1pp1/p1p3p1/3p2b1/N2P4/1N2P2P/PP3PPB/2R1R1K1 b - - bm Ne6;
2r1bk2/pp4pp/2nR4/8/4P3/5P2/PP4PP/3R2K1 b - - bm Ne5;
r2r2k1/p5bp/1p2p1p1/2p1p3/4N3/2P1P2P/PP3PP1/R4RK1 w - - bm Rfd1;
8/8/7K/8/p1p5/2Bp4/pn1N4/k3N3 w - - bm Nxd3;
1k1r4/1p6/p1prnp2/P3p1p1/1PP1P2p/5P2/2R1NKPP/1R6 b - - bm Rd2;
3r3r/ppp1bk1p/5p2/6p1/3p2b1/P2P4/1PPNNPPP/R3R1K1 b - - bm c5;
21) Key move Re3 ?
It's white to play but mainline gives black winning.
Nonsense.
Conclusion : Not a good test position.
22) Key move Ke6 ?
No point for this move. It's a drawish position.
There's 2 blunders in the pgn : 59.Kh2? and 61.Ke2??
Conclusion : Not a good test position.
23) Key move Kf2 ?
It's white to play but mainline gives black winning.
Nonsense.
Conclusion : Not a good test position.
24) Key move Ne6 ?
It's black to play but mainline gives white winning.
Nonsense.
Conclusion : Not a good test position.
25) Key move Ne5
A lot of moves have no point in the mainline. It's a drawish position.
Even the latest position (0-1??) is draw !
Nonsense.
Conclusion : Not a good test position.
26) Key move Rfd1 ?
A lot of moves hold the advantage for white :
49/70 1:36:41 74 415 678k 12 828k +1,14 1.b3 h5 2.Rfd1 Kf7 3.Kf1 Bf8 4.Ke2 Be7 5.Rab1 Rac8 6.Rxd8 Rxd8 7.c4 g5 8.g4 h4 9.Rd1 Rxd1 10.Kxd1 Ke8 11.Nc3 Bd6 12.Nb5 Bb8 13.Kc2 Kf7 14.Nc3 Bd6 15.Kd3 Ke8 16.Ne4 Be7 17.Nd2 Kf7 18.Ke4 Bd6 19.Kf3 Bf8 20.Ne4 Be7 21.Ke2 Kg6 22.Kd1 Kf7 23.Kd2 Kg6 24.Kd3 Kf7 25.Nc3 Bd6 26.Kd2
49/70 1:36:41 74 415 678k 12 828k +1,14 1.Rfd1 Kf7 2.Kf1 Rab8 3.Rxd8 Rxd8 4.c4 Bf8 5.Re1 Ke7 6.Ke2 Ke8 7.Rd1 Rxd1 8.Kxd1 Be7 9.b3 g5 10.Kd2 Kf7 11.Kd3 Kg6 12.Ng3 h5 13.Ke4 Bd6 14.Kf3 Be7 15.Ne4 Kf5 16.g4+ hxg4+ 17.hxg4+ Kg6 18.Ke2 Kf7 19.Kd3 Kg6 20.Nc3 Bd6 21.Kc2 Bb8 22.Ne4 Bc7 23.Kd3 Bd8 24.Nd2 Be7 25.Ke2 Kf7 26.Ne4 Kg6 27.Kd1 Kf7 28.Kc2 Kg6 29.Kd2
49/70 1:36:41 74 415 678k 12 828k +1,21 1.c4 Kf7 2.Rfd1 Bf6 3.Rab1 h5 4.Kf1 Be7 5.Ke2 Rxd1 6.Rxd1 Rd8 7.Rxd8 Bxd8 8.Nd6+ Kg7 9.Kf3 a6 10.Ne4 Be7 11.Nd2 Kf6 12.Ke4 Bd6 13.Nf3 Bb8 14.b3 Bd6 15.g4 hxg4 16.hxg4 g5 17.Kd3 Bc7 18.Nd2 Kf7 19.Ne4 Bd8 20.Kc2 Be7 21.Kc3 Ke8 22.Nd2 Bf6 23.Kd3 Kd7 24.Ke2 b5 25.Ne4 Be7 26.Kd3 Kc6
49/70 1:36:41 74 415 678k 12 828k +1,21 1.Rad1 Kf8 2.c4 Kf7 3.Rxd8 Rxd8 4.Rc1 Rd7 5.Kf1 Bf6 6.Ke2 h5 7.Rc3 Be7 8.Ra3 Ke8 9.Nd2 Bh4 10.g3 Bd8 11.Rd3 Rb7 12.h4 Be7 13.Ne4 Rc7 14.Kf3 Rd7 15.Rxd7 Kxd7 16.Ng5 Bf6 17.Ke4 Ke7 18.Nf3 Kd6 19.b3 Bg7 20.Ng5 Ke7 21.Kf3 Bf6 22.Ne4 Bg7 23.Ke2 Bh6 24.Kd3 Kd7 25.Kc3 Bg7 26.Kc2 a6 27.Kd3 Kc6 28.Ng5
Conclusion : Not a good test position.
27) Key move Nxd3 ?
Yes, the only good move, mate in 13.
Found in 4 seconds.
Conclusion : Good move but easy.
28) Key move Rd2 ?
A lot of moves hold the advantage for white :
33/59 03:06 2 124 984k 11 373k -0,96 39. ... g4 40.fxg4 Ng5 41.Rbc1 Rd3 42.Nc3 h3 43.Kf1 hxg2+ 44.Rxg2 Rh8 45.Kg1 Rd4 46.b5 Rh3 47.Ne2 Rxe4 48.bxc6 bxc6 49.Rf1 Rh6 50.Ng3 Rxg4 51.Nf5 Nh3+ 52.Kh1 Rhg6 53.Rxg4 Rxg4 54.Ng3 Rxc4 55.Rxf6 Nf4 56.h4 Kc7 57.Rf5 Kd6 58.h5 Rc1+ 59.Kh2
33/59 03:06 2 124 984k 11 373k -1,01 39. ... Kc7 40.Ke1 h3 41.gxh3 Rh8 42.Ng1 Rd3 43.Kf2 Rh4 44.Kf1 Rh7 45.Kg2 Nf4+ 46.Kg3 Rh4 47.Rbb2 Rd1 48.Ne2 Rxh3+ 49.Kg4 Rxh2 50.Kf5 Nd3 51.Nf4 Rxc2 52.Ne6+ Kb8 53.Rxc2 Rf1 54.Kxf6 g4 55.Rg2 gxf3 56.Rd2 Nxb4 57.Kxe5 Re1 58.Nc5 Re2 59.Rd7
33/59 03:06 2 124 984k 11 373k -1,14 39. ... Rd3 40.h3 Rd1 41.Rcb2 Kc7 42.c5 R1d3 43.Ke1 Kd7 44.Nc1 Re3+ 45.Re2 Ra3 46.Rd2+ Ke7 47.Rxd8 Kxd8 48.Rb3 Ra1 49.Kd2 Ke7 50.Kd1 Ke8 51.Kd2 Kf7 52.Kd1 Kg6 53.Kd2 Nf4 54.Kc2 Nxg2 55.Rc3 Nf4 56.Kb2 Rxc1 57.Rxc1 Nd3+ 58.Kb1 Nxc1 59.Kxc1 f5 60.Kd2 f4
33/59 03:06 2 124 984k 11 373k -1,27 39. ... Rd2 40.Rbb2 Rxc2 41.Rxc2 Rd3 42.Rb2 Kc7 43.c5 Kd7 44.Nc1 Rd1 45.Ne2 Ke7 46.Nc3 Rd4 47.Ke3 Nf4 48.Ne2 Rd3+ 49.Kf2 Ne6 50.Nc1 Rd1 51.Ne2 Rh1 52.h3 Rd1 53.Nc3 Rd4 54.g3 Rd3 55.Ne2 Nd4 56.Nxd4 exd4 57.gxh4 gxh4 58.Rb1 Ke6 59.Rg1 Ke5 60.Rg4 Rd2+ 61.Ke1 Rb2 62.Kd1 Rxb4 63.Rxh4
Probably not crucial to win but appears to be the best move.
Stockfish prefer g4 for a long time.
Note there's a very bad move in the mainline in the PGN : 45.hxg3?? score goes from -1 to -2.50 , 45.Kxg3 is way better !
Conclusion : May be the first hard position ? But still dubious because of lot close winning moves.
29) Key move c5 ?
c5 has nothing special, other moves hold the advantage for black.
26/43 03:54 2 403 803k 10 270k -0,41 1. ... Be6 2.Ng3 h5 3.Re2 h4 4.Rae1 hxg3 5.Rxe6 gxh2+ 6.Kh1 Rd7 7.Nc4 c6 8.g3 Bc5 9.R1e2 Rh3 10.Re8 Rc7 11.R8e6 Be7 12.R2e4 Rh8 13.Re2 g4 14.Re1 Rd7 15.R6e4
26/43 03:54 2 403 803k 10 270k -0,43 1. ... b6 2.h3 Bc8 3.b4 Be6 4.b5 Rhe8 5.f4 g4 6.hxg4 Bxg4 7.Nb3 Bd6 8.Nexd4 Bxf4 9.Nc6 Ra8 10.a4 h5 11.Nbd4 Be3+ 12.Kh2 a6 13.bxa6 Rxa6 14.Nb5 Bd7 15.Rxe3 Rxe3
26/43 03:54 2 403 803k 10 270k -0,46 1. ... c5 2.a4 b6 3.Nc4 Be6 4.f4 h6 5.b3 Bd5 6.Kf2 Rhg8 7.fxg5 hxg5 8.Ng3 Rh8 9.h3 Rd7 10.Ne4 Rh4 11.Ned2 Rd8 12.Nf3 Rf4 13.Ncd2 Bd6 14.Ne4
26/43 03:54 2 403 803k 10 270k -0,52 1. ... Rhe8 2.b4 Be6 3.Ng3 Bf8 4.Nb3 b6 5.b5 Kg6 6.Re2 h5 7.Rae1 Bd7 8.Rxe8 Rxe8 9.Rxe8 Bxe8 10.a4 c5 11.bxc6 Bxc6 12.a5 bxa5 13.Nxa5 Bd5 14.Nb3 Bxb3 15.cxb3 Bd6 16.Ne2
26/43 03:54 2 403 803k 10 270k -0,56 1. ... Rd5 2.Ng3 h5 3.Re4 f5 4.Ree1 h4 5.Ngf1 Bf6 6.a4 Bh5 7.Nc4 Kg7 8.Nfd2 Rdd8 9.f3 Bf7 10.Kf2 Rhe8 11.b4 Kg6 12.b5 a6 13.bxa6 bxa6 14.Rab1 Bd5 15.Na5
Lines in the PGN are full of bad moves, it's certainly not the best way to play for the win.
Conclusion : Not a good test position.
30) Key move Kd3 ?
SF prefers 1.b4 over 1.Kd3 at depth 40/78, there's no lines in the PGN to show the relevance of 1.Kd3 .
40/78 14:44 11 048 997k 12 495k +2,28 1.Kd3 Nd8 2.Ke4 Nb7 3.f4 gxf4 4.exf4 exf4 5.Kd5 Kd7 6.Re1 Rc7 7.Re6 Nd8 8.Rxf6 f3 9.Rf8 f2 10.Ne3 h6 11.Rxf2 Rc6 12.g5 Rd6+ 13.Ke4 Re6+ 14.Kd3 hxg5 15.Ng4 Ke7 16.h6 Nf7 17.h7 Rd6+ 18.Ke4 Nh8 19.Ne3 Re6+ 20.Kd3 Ke8 21.Nd5 Re1 22.Rf6 Rh1 23.Rxb6 Nf7 24.Ra6 Rh3+ 25.Ke4 Kf8 26.Rxa5 Rxb3 27.Ne3 Kg7 28.Ra7 Rb8 29.Kf5 Rh8 30.Ng4 Rxh7 31.Ne5
40/78 14:44 11 048 997k 12 495k +2,76 1.b4 cxb4+ 2.axb4 Nc7 3.Kb3 Na6 4.bxa5 bxa5 5.Ka4 Rc5 6.Rd6 Nb8 7.Kb3 Nd7 8.Ra6 Kd8 9.Ng3 Kc8 10.Ne4 Kb7 11.Re6 Rc8 12.h6 Kc7 13.Re7 Kc6 14.Rxh7 Rf8 15.Kc3 Nc5 16.Nxc5 Kxc5 17.Rc7+ Kb6 18.Re7 Kc5 19.h7 Rh8 20.Rc7+ Kd6 21.Rf7 Kc5 22.Rxf6 Rxh7 23.Re6 Rh2 24.Rxe5+ Kb6 25.f4 gxf4 26.exf4 Rh3+ 27.Kd4 Rh4 28.Rb5+ Ka6 29.Rg5 a4 30.Kc3 a3 31.Kb4 Kb7
I'll stay with 1.b4 as the best move.
Conclusion : Wrong key move.
Conclusions on positions 21 to 30 :
------------------------------------
21) Not a good test position.
22) Not a good test position.
23) Not a good test position.
24) Not a good test position.
25) Not a good test position.
26) Not a good test position.
27) Good move but easy.
28) May be the first hard position ? But still dubious because of lot close moves in eval.
29) Not a good test position.
30) Wrong key move.
For me there's not only one interesting position on 10.