Hard talkchess 2016 beta 1

[EvgeniyZh]

2kr3r/1p3pb1/pBnqp2p/P2p2p1/8/2PB4/1P3PPP/R2Q1RK1 w - - bm b4

[Vinvin]

[d]2kr3r/1p3pb1/pBnqp2p/P2p2p1/8/2PB4/1P3PPP/R2Q1RK1 w - - bm b4

Nice one ! But when b4 is played on the board, SF sees after 10 seconds a very good score for white !
30min01sec at first try :

Code: Select all

Stockfish_160621_x64_modern_fast:
...
 23/32	00:07	 77 540k	10 143k	+0,39	1.Bxd8 Rxd8 2.Qc2 Kb8 3.Qb3 Ne5 4.Be2 f5 5.h3 Nd7 6.Rfd1 Bf6 7.Bf3 Ne5 8.Bh5 Rc8 9.Be2 Nd7 10.Re1 Ne5 11.Qa3 Qc7 12.Rad1 Ka7 13.Qb3 Nc6 14.Bh5 Nxa5 15.Qc2
 24/32	00:09	 91 608k	10 131k	+0,39	1.Bxd8 Rxd8 2.Qc2 Kb8 3.Qb3 Ne5 4.Be2 f5 5.h3 Nd7 6.Rfd1 Bf6 7.Bf3 Ne5 8.Bh5 Rc8 9.Be2 Nd7 10.Re1 Ne5 11.Qa3 Qc7 12.Rad1 Ka7 13.Qb3 Nc6
 25/34-	00:25	 244 702k	9 704k	+0,32	1.Bxd8 Rxd8
 25/34+	00:44	 435 730k	9 744k	+0,39	1.Qc2
 25/36	00:54	 535 466k	9 772k	+0,41	1.Qc2 Kb8 2.Qb3 Kc8 3.Bxd8 Rxd8 4.Rfc1 Be5 5.g3 h5 6.Qa3 Qxa3 7.Rxa3 Kc7 8.b4 g4 9.Rb3 Bd6 10.Rbb1 Ne5 11.Be2 Rh8 12.c4 dxc4 13.Bxc4 Nf3+ 14.Kg2
 26/44	01:15	 743 348k	9 877k	+0,45	1.Qc2 Kb8 2.Qb3 Kc8 3.Bxd8 Rxd8 4.Qa4 Be5 5.h3 Kb8 6.Qb3 Kc8 7.Rfd1 Qc7 8.Qb6 Bh2+ 9.Kf1 Bd6 10.Qxc7+ Bxc7 11.b4 d4 12.cxd4 Rxd4 13.b5 axb5 14.Bxb5 Rxd1+ 15.Rxd1 Bxa5 16.Bxc6 bxc6
 27/44	01:39	 985 549k	9 928k	+0,48	1.Bxd8 Rxd8 2.Qa4 f5 3.b4 Bxc3 4.Rab1 Ne5 5.Rfc1 d4 6.Bf1 Ng4 7.g3 Ne5 8.b5 Nf3+ 9.Kh1 axb5 10.Qxb5 Qd5 11.a6 Qxb5 12.Rxb5 bxa6 13.Rb6 Nd2 14.Rxe6 Nxf1 15.Rxf1 a5 16.Rxh6 Kd7 17.Rf6 a4 18.Rxf5 d3 19.Rxg5
 28/44-	01:57	 1 170 385k	9 950k	+0,41	1.Bxd8 Rxd8
 28/44+	02:07	 1 266 373k	9 944k	+0,48	1.Bxd8
 28/44	02:46	 1 643 139k	9 890k	+0,52	1.Bxd8 Rxd8 2.Qa4 Be5 3.h3 f5 4.Rfd1 Kb8 5.Qb3 Ka8 6.Qa3 Qxa3 7.Rxa3 d4 8.Bc4 Kb8 9.Re1 dxc3 10.bxc3 Rd6 11.g3 h5 12.h4 g4 13.Kg2 Kc7 14.Bb3 Bxc3 15.Rxe6 Bxa5 16.Rxd6 Kxd6 17.Bf7 Bb6 18.Rd3+ Ke5
 29/44	02:47	 1 660 320k	9 892k	+0,52	1.Bxd8 Rxd8 2.Qa4 Be5 3.h3 f5 4.Rfd1 Kb8 5.Qb3 Ka8 6.Qa3 Qxa3 7.Rxa3 d4 8.Bc4 Kb8 9.Re1 dxc3 10.bxc3 Rd6 11.g3 h5 12.h4 g4 13.Kg2 Kc7 14.Bb3 Bxc3 15.Rxe6 Bxa5 16.Rxd6 Kxd6 17.Bf7 Bb6
 30/44	02:57	 1 759 618k	9 889k	+0,51	1.Bxd8 Rxd8 2.Qa4 Be5 3.h3 f5 4.Rfd1 Kb8 5.Qb3 Ka8 6.Qa3 Qxa3 7.Rxa3 d4 8.Bc4 Kb8 9.Re1 dxc3 10.bxc3 Rd6 11.g3 h5 12.h4 g4 13.Kg2 Kc7 14.Bb3 Bxc3 15.Rxe6 Bb4 16.Ra2 Bxa5 17.Rxd6 Kxd6 18.Bf7
 31/44	03:56	 2 356 198k	9 956k	+0,54	1.Bxd8 Rxd8 2.Qa4 Be5 3.h3 f5 4.Rfe1 h5 5.Qa3 Qxa3 6.Rxa3 Bd6 7.Ra2 Kd7 8.b4 Ne5 9.Be2 Rc8 10.b5 axb5 11.Rb2 b4 12.cxb4 g4 13.b5 gxh3 14.gxh3 f4 15.a6 Rg8+ 16.Kh1 f3 17.Bf1 Nc4 18.Bxc4 dxc4 19.Rc2 bxa6
 32/44-	05:10	 3 106 477k	9 990k	+0,47	1.Bxd8 Rxd8
 32/44	05:33	 3 328 390k	9 989k	+0,52	1.Bxd8 Rxd8 2.Qa4 Be5 3.h3 Qc7 4.Rfb1 Rg8 5.Be2 f5 6.Re1 Kb8 7.Qb3 Ka7 8.Bd1 Re8 9.Bf3 Kb8 10.Be2 Ka7 11.Qa4 Rd8 12.Rec1 Bf4 13.Rc2 Kb8 14.b4 d4 15.Rd1 dxc3 16.Rxc3 Rxd1+ 17.Qxd1 Qd6
 33/46	09:42	 5 870 561k	10 074k	+0,58	1.Bxd8 Rxd8 2.Qa4 f5 3.b4 Bxc3 4.Rab1 Ne5 5.Rfc1 d4 6.Bf1 Ng4 7.g3 Ne5 8.b5 Nf3+ 9.Kh1 axb5 10.Qxb5 Qc6 11.Qxc6+ bxc6 12.a6 Kc7 13.Kg2 Nd2 14.Rb7+ Kd6 15.Be2 c5 16.a7 Ra8 17.Rc2 c4 18.Ra2 Kc5 19.Ra6 d3
 34/56-	14:10	 8 546 694k	10 044k	+0,51	1.Bxd8 Rxd8
 34/56	16:01	 9 688 349k	10 077k	+0,56	1.Bxd8 Rxd8 2.Qa4 Kd7 3.Rfd1 Ke7 4.Be2 Qc7 5.Qa3+ Qd6 6.g3 Qxa3 7.Rxa3 Be5 8.Kg2 Rc8 9.Rb1 Kf6 10.Ra4 Rd8 11.Re1 Kg7 12.Raa1 Kf6 13.Ra3 d4 14.cxd4 Bxd4 15.Rd1 Bxb2 16.Rf3+ Kg6 17.Rb3 Be5 18.Rxb7 Nxa5 19.Rb6 Rxd1
 35/56-	17:07	 10 376 455k	10 098k	+0,50	1.Bxd8 Rxd8
 35/56-	18:54	 11 472 817k	10 117k	+0,43	1.Bxd8 Rxd8
 35/56+	30:01	 18 259 305k	10 135k	+0,50	1.b4
 35/56	30:44	 18 693 261k	10 133k	+0,46	1.b4 Bxc3 2.b5 axb5 3.Bxb5 Bxa1 4.Qxa1 Qe5 5.Qa4 Kd7 6.a6 Ra8 7.Bd4 Qb8 8.a7 Qc8 9.Rc1 Rd8 10.Bb6 Rg8 11.h3 Rg6 12.Qd4 Ke8 13.Re1 f6 14.Qxd5 Kf7 15.Qd6 f5 16.Rc1 Qf8 17.Qd7+ Qe7 18.Bxc6 bxc6 19.Qxc6 Rgg8 20.Qa4 Kg6 21.Rc7 Qd6 22.Rc6 Qd7 23.Qc2 Kf7
 36/57+	32:48	 19 975 999k	10 147k	+0,53	1.b4
 36/57+	33:53	 20 590 721k	10 126k	+0,60	1.b4
 36/59+	49:15	 30 156 931k	10 204k	+1,05	1.b4
 36/64	1:01:53	 37 153 547k	10 006k	+1,24	1.b4 d4 2.Bc5 Qf4 3.g3 Qb8 4.c4 Ne5 5.Bb6 Kd7 6.b5 Rc8 7.c5 Nxd3 8.Qxd3 Ke7 9.c6 axb5 10.Bc5+ Ke8 11.Bxd4 Kf8 12.cxb7 Qxb7 13.a6 Qd5 14.Qa3+ Kg8 15.Bxg7 Kxg7 16.Qb2+ e5 17.Rfd1 Qc5 18.Rac1 Qe7 19.Qxb5 Rxc1 20.Rxc1 Rd8 21.Rc6 Rd2 22.a7 Qxa7 23.Qxe5+ Kg8 24.Rc8+ Kh7
 37/64-	1:06:16	 39 562 124k	9 949k	+1,17	1.b4 Bxc3

[Eelco de Groot]

[d]2kr3r/1p3pb1/pBnqp2p/P2p2p1/8/2PB4/1P3PPP/R2Q1RK1 w - - bm b4

Nice one ! But when b4 is played on the board, SF sees after 10 seconds a very good score for white !
30min01sec at first try :

Code: Select all

Stockfish_160621_x64_modern_fast:
...
 23/32	00:07	 77 540k	10 143k	+0,39	1.Bxd8 Rxd8 2.Qc2 Kb8 3.Qb3 Ne5 4.Be2 f5 5.h3 Nd7 6.Rfd1 Bf6 7.Bf3 Ne5 8.Bh5 Rc8 9.Be2 Nd7 10.Re1 Ne5 11.Qa3 Qc7 12.Rad1 Ka7 13.Qb3 Nc6 14.Bh5 Nxa5 15.Qc2
 24/32	00:09	 91 608k	10 131k	+0,39	1.Bxd8 Rxd8 2.Qc2 Kb8 3.Qb3 Ne5 4.Be2 f5 5.h3 Nd7 6.Rfd1 Bf6 7.Bf3 Ne5 8.Bh5 Rc8 9.Be2 Nd7 10.Re1 Ne5 11.Qa3 Qc7 12.Rad1 Ka7 13.Qb3 Nc6
 25/34-	00:25	 244 702k	9 704k	+0,32	1.Bxd8 Rxd8
 25/34+	00:44	 435 730k	9 744k	+0,39	1.Qc2
 25/36	00:54	 535 466k	9 772k	+0,41	1.Qc2 Kb8 2.Qb3 Kc8 3.Bxd8 Rxd8 4.Rfc1 Be5 5.g3 h5 6.Qa3 Qxa3 7.Rxa3 Kc7 8.b4 g4 9.Rb3 Bd6 10.Rbb1 Ne5 11.Be2 Rh8 12.c4 dxc4 13.Bxc4 Nf3+ 14.Kg2
 26/44	01:15	 743 348k	9 877k	+0,45	1.Qc2 Kb8 2.Qb3 Kc8 3.Bxd8 Rxd8 4.Qa4 Be5 5.h3 Kb8 6.Qb3 Kc8 7.Rfd1 Qc7 8.Qb6 Bh2+ 9.Kf1 Bd6 10.Qxc7+ Bxc7 11.b4 d4 12.cxd4 Rxd4 13.b5 axb5 14.Bxb5 Rxd1+ 15.Rxd1 Bxa5 16.Bxc6 bxc6
 27/44	01:39	 985 549k	9 928k	+0,48	1.Bxd8 Rxd8 2.Qa4 f5 3.b4 Bxc3 4.Rab1 Ne5 5.Rfc1 d4 6.Bf1 Ng4 7.g3 Ne5 8.b5 Nf3+ 9.Kh1 axb5 10.Qxb5 Qd5 11.a6 Qxb5 12.Rxb5 bxa6 13.Rb6 Nd2 14.Rxe6 Nxf1 15.Rxf1 a5 16.Rxh6 Kd7 17.Rf6 a4 18.Rxf5 d3 19.Rxg5
 28/44-	01:57	 1 170 385k	9 950k	+0,41	1.Bxd8 Rxd8
 28/44+	02:07	 1 266 373k	9 944k	+0,48	1.Bxd8
 28/44	02:46	 1 643 139k	9 890k	+0,52	1.Bxd8 Rxd8 2.Qa4 Be5 3.h3 f5 4.Rfd1 Kb8 5.Qb3 Ka8 6.Qa3 Qxa3 7.Rxa3 d4 8.Bc4 Kb8 9.Re1 dxc3 10.bxc3 Rd6 11.g3 h5 12.h4 g4 13.Kg2 Kc7 14.Bb3 Bxc3 15.Rxe6 Bxa5 16.Rxd6 Kxd6 17.Bf7 Bb6 18.Rd3+ Ke5
 29/44	02:47	 1 660 320k	9 892k	+0,52	1.Bxd8 Rxd8 2.Qa4 Be5 3.h3 f5 4.Rfd1 Kb8 5.Qb3 Ka8 6.Qa3 Qxa3 7.Rxa3 d4 8.Bc4 Kb8 9.Re1 dxc3 10.bxc3 Rd6 11.g3 h5 12.h4 g4 13.Kg2 Kc7 14.Bb3 Bxc3 15.Rxe6 Bxa5 16.Rxd6 Kxd6 17.Bf7 Bb6
 30/44	02:57	 1 759 618k	9 889k	+0,51	1.Bxd8 Rxd8 2.Qa4 Be5 3.h3 f5 4.Rfd1 Kb8 5.Qb3 Ka8 6.Qa3 Qxa3 7.Rxa3 d4 8.Bc4 Kb8 9.Re1 dxc3 10.bxc3 Rd6 11.g3 h5 12.h4 g4 13.Kg2 Kc7 14.Bb3 Bxc3 15.Rxe6 Bb4 16.Ra2 Bxa5 17.Rxd6 Kxd6 18.Bf7
 31/44	03:56	 2 356 198k	9 956k	+0,54	1.Bxd8 Rxd8 2.Qa4 Be5 3.h3 f5 4.Rfe1 h5 5.Qa3 Qxa3 6.Rxa3 Bd6 7.Ra2 Kd7 8.b4 Ne5 9.Be2 Rc8 10.b5 axb5 11.Rb2 b4 12.cxb4 g4 13.b5 gxh3 14.gxh3 f4 15.a6 Rg8+ 16.Kh1 f3 17.Bf1 Nc4 18.Bxc4 dxc4 19.Rc2 bxa6
 32/44-	05:10	 3 106 477k	9 990k	+0,47	1.Bxd8 Rxd8
 32/44	05:33	 3 328 390k	9 989k	+0,52	1.Bxd8 Rxd8 2.Qa4 Be5 3.h3 Qc7 4.Rfb1 Rg8 5.Be2 f5 6.Re1 Kb8 7.Qb3 Ka7 8.Bd1 Re8 9.Bf3 Kb8 10.Be2 Ka7 11.Qa4 Rd8 12.Rec1 Bf4 13.Rc2 Kb8 14.b4 d4 15.Rd1 dxc3 16.Rxc3 Rxd1+ 17.Qxd1 Qd6
 33/46	09:42	 5 870 561k	10 074k	+0,58	1.Bxd8 Rxd8 2.Qa4 f5 3.b4 Bxc3 4.Rab1 Ne5 5.Rfc1 d4 6.Bf1 Ng4 7.g3 Ne5 8.b5 Nf3+ 9.Kh1 axb5 10.Qxb5 Qc6 11.Qxc6+ bxc6 12.a6 Kc7 13.Kg2 Nd2 14.Rb7+ Kd6 15.Be2 c5 16.a7 Ra8 17.Rc2 c4 18.Ra2 Kc5 19.Ra6 d3
 34/56-	14:10	 8 546 694k	10 044k	+0,51	1.Bxd8 Rxd8
 34/56	16:01	 9 688 349k	10 077k	+0,56	1.Bxd8 Rxd8 2.Qa4 Kd7 3.Rfd1 Ke7 4.Be2 Qc7 5.Qa3+ Qd6 6.g3 Qxa3 7.Rxa3 Be5 8.Kg2 Rc8 9.Rb1 Kf6 10.Ra4 Rd8 11.Re1 Kg7 12.Raa1 Kf6 13.Ra3 d4 14.cxd4 Bxd4 15.Rd1 Bxb2 16.Rf3+ Kg6 17.Rb3 Be5 18.Rxb7 Nxa5 19.Rb6 Rxd1
 35/56-	17:07	 10 376 455k	10 098k	+0,50	1.Bxd8 Rxd8
 35/56-	18:54	 11 472 817k	10 117k	+0,43	1.Bxd8 Rxd8
 35/56+	30:01	 18 259 305k	10 135k	+0,50	1.b4
 35/56	30:44	 18 693 261k	10 133k	+0,46	1.b4 Bxc3 2.b5 axb5 3.Bxb5 Bxa1 4.Qxa1 Qe5 5.Qa4 Kd7 6.a6 Ra8 7.Bd4 Qb8 8.a7 Qc8 9.Rc1 Rd8 10.Bb6 Rg8 11.h3 Rg6 12.Qd4 Ke8 13.Re1 f6 14.Qxd5 Kf7 15.Qd6 f5 16.Rc1 Qf8 17.Qd7+ Qe7 18.Bxc6 bxc6 19.Qxc6 Rgg8 20.Qa4 Kg6 21.Rc7 Qd6 22.Rc6 Qd7 23.Qc2 Kf7
 36/57+	32:48	 19 975 999k	10 147k	+0,53	1.b4
 36/57+	33:53	 20 590 721k	10 126k	+0,60	1.b4
 36/59+	49:15	 30 156 931k	10 204k	+1,05	1.b4
 36/64	1:01:53	 37 153 547k	10 006k	+1,24	1.b4 d4 2.Bc5 Qf4 3.g3 Qb8 4.c4 Ne5 5.Bb6 Kd7 6.b5 Rc8 7.c5 Nxd3 8.Qxd3 Ke7 9.c6 axb5 10.Bc5+ Ke8 11.Bxd4 Kf8 12.cxb7 Qxb7 13.a6 Qd5 14.Qa3+ Kg8 15.Bxg7 Kxg7 16.Qb2+ e5 17.Rfd1 Qc5 18.Rac1 Qe7 19.Qxb5 Rxc1 20.Rxc1 Rd8 21.Rc6 Rd2 22.a7 Qxa7 23.Qxe5+ Kg8 24.Rc8+ Kh7
 37/64-	1:06:16	 39 562 124k	9 949k	+1,17	1.b4 Bxc3

Very interesting, I could not find a thing. So for me it is a legitimately difficult testposition. That Stockfish solves it one time in 10 seconds does not prove a thing I first went for 2. Bc5 as the most promising try, but it is a dead end after 2. Bc5 Qe5 3. Rb1 d4 4. Qa4 {+=}

After 10 hours or so of searching in this position...

[D]2kr3r/1p3p2/p1n1p2p/P1B1q1p1/QP1p4/2bB4/5PPP/1R3RK1 b - -

32 325:56 +0.17 4...Qd5 5.Rfc1 Ne5 6.Bf1 Rd7 7.Bb6 Nc4
8.Bxd4 Qxd4 9.Rb3 Kb8 10.Rbxc3 Ne5
11.Qc2 Qxb4 12.Bxa6 Rhd8 13.Rb3 Qd6
14.Rb6 Qd2 15.Qxd2 Rxd2 16.Rxb7+ Ka8
17.Rbc7 Rd1+ (111.398.557.695) 5696

31 325:56 +0.66 4...Nb8 5.Ba7 Rd6 6.b5 Nd7 7.Qa3 Kd8
8.bxa6 bxa6 9.Rb7 Ke7 10.Bb6 Kf6
11.Bc7 Nc5 12.Bxa6 Qd5 13.f4 Rxa6
14.Rb5 Rc6 15.Be5+ Kg6 16.Bxh8 Qc4
17.a6 Qxb5 (111.398.557.695) 5696

31 325:56 +1.05 4...Kd7 5.Bb6 Ke7 6.b5 Nb8 7.bxa6 bxa6
8.Bxd8+ Rxd8 (111.398.557.695) 5696

31 325:56 +1.34 4...h5 5.Bb6 h4 6.b5 h3 7.g3 axb5
8.Bxb5 Kd7 9.Bxd8 Qe4 10.Bxc6+ bxc6 (111.398.557.695) 5696

31 325:56 +1.55 4...Rd5 5.Bxa6 Kc7 6.Bc4 Rxc5 7.bxc5 Bxa5
8.Rb5 Ra8 9.Rfb1 Ra7 10.Qc2 Bc3
11.Bf1 Qf6 12.Rb6 Qf5 13.Qb3 Qxc5
14.Rxb7+ Kd8 (111.398.557.695) 5696

31 325:56 +2.34 4...Rd6 5.Bxd6 Qxd6 6.b5 Nb4 7.Be2 Kd8
8.bxa6 bxa6 9.Bxa6 Nxa6 10.Rb6 Qc5
11.Rxa6 Ke7 12.Rb6 Kf6 13.f4 gxf4
14.Rxf4+ Kg7 15.Rb5 Qa7 16.a6 d3+
17.Kh1 (111.398.557.695) 5696

So Stockfish says 2. b5 maybe, but then what is the line after 1...Bxc3 2. b5 Bxa1 3. Qxa1 Ne5 for instance? Tommy Cooper here at first sees nothing. 4. Rc1+ fails high but then dismally fails low... Then finally fails high again... So difficult enough?

[D]2kr3r/1p3p2/pB1qp2p/PP1pn1p1/8/3B4/5PPP/Q4RK1 w - -

Engine: Tommy Cooper MP 011 (512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott

27 14:57 +1.86 4.Rc1+ Kd7 5.Bc7 Nxd3 6.Bxd6 Nxc1
7.Ba3 Ne2+ 8.Kh1 (5.243.615.430) 5839

27 14:57 -0.48 4.Be2 axb5 5.Bxb5 Kb8 6.Rb1 f6 7.Bf1 Nc4
8.Bxd8 Rxd8 9.a6 b6 10.Qxf6 e5
11.Qg7 Rd7 12.Qg8+ Ka7 13.Rd1 Qc6
14.Qe8 Rc7 15.Qxc6 Rxc6 16.Rxd5 Kxa6
17.Bxc4+ (5.243.615.430) 5839

27 14:57 -0.62 4.Qc3+ Kd7 (5.243.615.430) 5839

27 14:57 -0.69 4.Qd4 Nxd3 5.Qxd3 Kd7 6.bxa6 bxa6
7.Qxa6 Ke7 8.Rc1 Qf4 9.Bxd8+ Rxd8
10.Qa7+ Kf6 11.Rc3 Kg6 12.g3 Qf6
13.Rd3 d4 14.a6 Qe5 15.Qe7 Qd6
16.Qb7 Rb8 17.Rxd4 (5.243.615.430) 5839

27 14:57 -0.69-- 4.bxa6 Nxd3 5.Qc3+ Kd7 6.Qxd3 (5.243.615.430) 5839

26 14:57 -1.10 4.Bd4 Nxd3 5.Bxh8 d4 6.Bf6 Rd7
7.bxa6 bxa6 8.Qb1 e5 9.Bxg5 hxg5
10.Qxd3 f6 11.Rb1 Rb7 12.Qc4+ Kb8
13.Rxb7+ Kxb7 14.f3 Qc7 15.Qd5+ Ka7
16.Kf1 f5 17.h3 (5.243.615.430) 5839

actually Tommy saw nothing at first, he was probably wearing a blindfold for the act.

[Vinvin]

That Stockfish solves it one time in 10 seconds does not prove a thing

I mean : in the position after b4, Stockfish gives a good eval to white in 10 seconds.

[Paloma]

8/p2k1pp1/r3p1p1/8/1P6/P1R1PKPP/5P2/8 b - - bm Rd6

After 1...Rd6

8/p2k1pp1/3rp1p1/8/1P6/P1R1PKPP/5P2/8 w - - 0 1

Analysis by Stockfish 260616 64:

2.Ke2 Rb6 3.Kd3 e5 4.h4 Rf6 5.f4 Re6 6.b5 exf4 7.exf4 Rd6+ 8.Kc4 Re6 9.Kb4 Re1 10.a4 Kd8 ....
+- (2.06) Tiefe: 39/70 00:37:21 6245MN, tb=2316559

[jdart]

Here is one that Arasan has quite a lot of trouble with:

[D] 1r1q1k2/p4p2/1p2pNp1/2p1P1Qn/5P2/3P3R/2r4P/4R1K1 w - -

bm is f5, with the idea that .. exf5 is answered by the Zwischenzug Kh1, and then Black is toast (better is .. Qd4+ but White is still better).

Arasan however prefers Kh1 with a draw score. A draw looks good here, because White is down two pawns. But the right move is to give up another one!

Still, I don't think this counts as hard if you are measuring it by how well Stockfish and Komodo do: they both find f5 quickly.

--Jon

[Paloma]

Why is 1...Rd6 better than e.g. 1...Rb6 ?

[EvgeniyZh]

Why is 1...Rd6 better than e.g. 1...Rb6 ?

That's not good for test according to what I and others got here, just all the engines went for Rc6 for quite a long time, and it's definetely losing, but at the end Rd6 is losing too (and any other move if I'm not missing something)

[Vinvin]

2kr3r/1p3pb1/pBnqp2p/P2p2p1/8/2PB4/1P3PPP/R2Q1RK1 w - - bm b4

3 new runs, 1h per position, 6*4GHz.
Solutions after 5m20s, 23m10s and 40m56s.
Analyzing engine: Stockfish_160626_x64_modern_fast

Code: Select all

b2-b4              b2-b4   * 1390 Seconds
b2-b4              b2-b4   * 2456 Seconds
b2-b4              b2-b4   * 320 Seconds

[Dann Corbit]

Code: Select all

Searching: rnb1k1nr/p2p1ppp/3B4/1p1N1N1P/4P1P1/3P1Q2/P1P1K3/q5b1 w - - 0 1
infinite: 0 ponder: 0 time: 0 increment: 0 moves to go: 0

 1   -7.19   00:00      52  Nc7+ Kd8 
 2   -0.71   00:00     152  Be7 Qe1+ Kxe1 
 3   -5.68   00:00     238  Nc7+ Kd8 Nxa8 Qxa2 
 4   -6.26   00:00     425  e5 f6 exf6 Nxf6 Nxf6+ Qxf6 
 5   -5.59   00:00     799  Bxb8 Nh6 Nxh6 gxh6 Bd6 
 6   -6.03   00:00    1329  e5 f6 exf6 Nxf6 Nxf6+ Qxf6 Qxa8 
 7   -5.94   00:00    1542  e5 f6 exf6 Nxf6 Nxf6+ Qxf6 Qxa8 Kf7 
 8   -5.94   00:00    1835  e5 f6 exf6 Nxf6 Nxf6+ Qxf6 Qxa8 Kf7 Bxb8 
 9   -4.97   00:00   11378  e5 Bb7 Nc7+ Kd8 Qxb7 Qxa2 Qxa8 Qxc2+ Ke1 Qb1+ Ke2 Kc8 Nd5 
10   -4.89   00:00   13098  e5 Bb7 Nc7+ Kd8 Qxb7 Qxa2 Qxa8 Qxc2+ Ke1 Qc1+ Ke2 Kc8 Nd5 
11   -4.22   00:00   17042  e5 Bb7 Nc7+ Kd8 Qxb7 Qc1 Qxa8 Qxc2+ Ke1 Qc1+ Ke2 Qb2+ Ke1 Qb1+ Kd2 Qxa2+ Kd1 Qa1+ Ke2 Kc8 Nd5 
12   -3.86   00:00   30062  e5 Bb7 Nc7+ Kd8 Qxb7 Qxa2 Ne3 Bxe3 Nxa8 Na6 Kxe3 Nh6 Nc7 Nxg4+ Kf4 Qa4+ c4 
13   +1.31   00:00  118781  e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 g6 Qf1 gxf5 Qxg1 Nh6 gxf5 Nxf5 Qg5+ Nce7 h6 
14   +0.73   00:00  142432  e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 g6 Qg3 gxf5 gxf5 Nge7 f6 Nf5 Qxg1 Re8 Kd2 Ncd4 Kd1 Rxe5 
15   +1.18   00:00  160344  e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 g6 Qg2 gxf5 gxf5 Nge7 f6 Bc5 fxe7+ Bxe7 Qg7 
16   +1.23   00:00  162724  e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 g6 Qg2 gxf5 gxf5 Nge7 f6 Nf5 Qxg1 Kc8 c3 Kb7 Qg4 
17   +1.23   00:00  234397  e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 g6 Kf1 gxf5 Kxg1 Nge7 gxf5 Nxe5 Qb7 N7c6 Nc7 Rg8+ Kf2 Rg5 Nxb5 Rxf5+ Ke3 Ke7 
18   +1.23   00:00  258697  e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 g6 hxg6 hxg6 Kf1 gxf5 Kxg1 Kc8 gxf5 Kb7 e6 fxe6 fxe6 Ne7 exd7 Rxa8 
19   +1.71   00:00  429635  e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 g6 Kf1 gxf5 Kxg1 Nge7 gxf5 Rg8+ Kh1 Kc8 Qf4 Kb7 f6 Nd5 Qe4 Nc3 Qxh7 Rxa8 e6 Ne5 d4 Nc4 Qxf7 
20   +1.38   00:00  724878  e5 Ba6 Nc7+ Kd8 Nxa6 Bb6 Qxa8 Qc3 Qxb8+ Qc8 Qxc8+ Kxc8 Bf8 h6 Nd6+ Kd8 Nxf7+ Ke8 Nxh8 Kxf8 Ng6+ Kf7 Kf3 Ne7 Nxe7 Kxe7 Ke4 d6 d4 dxe5 
21   +1.71   00:00  765793  e5 Ba6 Nc7+ Kd8 Nxa6 Bb6 Qxa8 Qc3 Qxb8+ Qc8 Qxc8+ Kxc8 Bf8 h6 Nd6+ Kd8 Nxf7+ Ke8 Nxh8 Kxf8 Ng6+ Kf7 Kf3 Ne7 Nxe7 Kxe7 Ke4 d6 d4 dxe5 Kxe5 Kd7 Kd5 
22   +1.76   00:01  820741  e5 Ba6 Nc7+ Kd8 Nxa6 Bb6 Qxa8 Qc3 Qxb8+ Qc8 Qxc8+ Kxc8 Bf8 h6 Nd6+ Kd8 Nxf7+ Ke8 Nxh8 Kxf8 Ng6+ Kf7 Kf3 Ne7 Nxe7 Kxe7 Ke4 Ke6 d4 d5+ Kd3 Ke7 c3 Ba5 Nc5 b4 cxb4 Bxb4 Kc2 Be1 
23   +1.80   00:01   1117K  e5 Ba6 Nc7+ Kd8 Nxa6 Bb6 Qxa8 Qc3 Qxb8+ Qc8 Qxc8+ Kxc8 Bf8 h6 Nd6+ Kd8 Nxf7+ Ke8 Nxh8 Kxf8 Ng6+ Ke8 Kf3 Ne7 Nxe7 Kxe7 Ke4 Ke6 d4 d5+ Kd3 Ke7 c3 Ba5 Kc2 Kf7 Nb4 Bxb4 cxb4 Ke7 Kd3 
24   +1.97   00:02   1872K  e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 g6 Kf1 gxf5 Kxg1 Nge7 gxf5 Rg8+ Kh1 Nxe5 Qb7 f6 Nc7 Nf3 Qxf3 Kxc7 Qf4+ Kd8 Qh6 Ke8 Qxf6 Rf8 Qg7 Rxf5 Qxh7 Rf2 d4 Nf5 h6 
25   +2.05   00:05   4242K  e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 g6 Kf1 gxf5 Kxg1 fxg4 Qxf7 Nge7 e6 Kc8 Qf4 d6 Qxd6 Kb7 Nc7 Rd8 Qg3 Nd4 Kg2 Ndf5 Qe5 a6 c4 bxc4 dxc4 Rd2+ Kf1 Rd1+ Ke2 Rd4 Nd5 Rxc4 Nxe7 Nxe7 Kd3 
26   +2.09   00:07   5900K  e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 g6 Kf1 gxf5 Kxg1 Nge7 gxf5 Rg8+ Kh1 Nxe5 Qb7 f6 Nc7 Nf3 Ne6+ dxe6 Qxf3 exf5 Qa8+ Kd7 Qxa7+ Ke8 Qb8+ Kf7 Qxb5 Rg5 Qc4+ Kg7 Qc7 Kf7 
27   +2.31   00:11   9680K  e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 g6 Kf1 gxf5 Kxg1 fxg4 Qxf7 Nge7 e6 Kc8 Qf4 d6 Qxd6 Kb7 Nc7 Rd8 Qg3 Nd4 Kg2 a6 c4 Ndf5 Qe5 bxc4 dxc4 Rd2+ Kf1 Rc2 Nd5 Rxc4 
28   +2.42   00:16  13300K  e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 g6 Kf1 gxf5 Kxg1 fxg4 Qxf7 Nge7 e6 Kc8 Qf4 d6 Qxd6 Kb7 Nc7 Rd8 Qg3 Nd4 Kg2 Kb6 c4 bxc4 dxc4 Ndf5 Qe5 Rd2+ Kg1 Rd1+ Kf2 g3+ Ke2 Rd4 Nd5+ Nxd5 Qxf5 
29   +2.51   00:34  28127K  e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 g6 Kf1 gxf5 Kxg1 Nge7 gxf5 Rg8+ Kh1 Nxe5 Qb7 f6 Nc7 Nf3 Ne6+ dxe6 Qxf3 Rg5 fxe6 Kc7 h6 Kd6 Qxf6 Rg6 Qd4+ Kxe6 Qxa7 Rxh6+ Kg2 Rh5 Qa6+ Kd7 Kf3 Rd5 Qh6 Rc5 Qh3+ Ke8 Qh2 h5 d4 Rf5+ Ke4 Rg5 Qd6 Kf7 Qh6 Rg4+ Kf3 
30   +2.49   01:17  60515K  e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 g6 Kf1 gxf5 Kxg1 fxg4 Qxf7 Nge7 Qf4 Nd5 Qe4 Nc3 Qxg4 Re8 e6 dxe6 Qg7 Nd5 Qb7 Ne5 Qxa7 Rg8+ Kf2 Rg5 Nb6 Rxh5 Nxd5 exd5 Qc5 Nd7 Qxb5 Rh2+ Kg3 
31   +2.64   02:32 117289K  h6 gxh6 e5 Ba6 Nc7+ Kd8 Nxa6 Bb6 Qxa8 Qc3 Nb4 Bc7 Kf3 Bxd6 Nxd6 Ne7 Qxb8+ Nc8 Nxf7+ Ke8 Nxh8 a5 Nd5 Qc6 c4 bxc4 dxc4 Qxc4 Ne3 Qc6+ Kf2 a4 Ke2 Qa6+ Ke1 Qa5+ Kf2 Qc3 Qb7 Qc6 Qxc6 dxc6 Nf5 Kd7 Kf3 h5 gxh5 Nb6 Nh6 Ke6 N8f7 
32   +3.55   03:15 153942K  h6 gxh6 e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 Nge7 Kf1 Bd4 Nxd4 Nxd4 Qb7 Ndc6 Nc7 Rg8 Nxb5 Rxg4 Qa8+ Nc8 Nd6 Ne7 Qf3 Rb4 Qxf7 a6 Qf8+ Kc7 Ne8+ Kb8 Nf6 Kc7 Ke1 Rb5 d4 Nc6 c3 h5 Qe8 Rb1+ Ke2 Rb2+ Kd3 Nb6 Qxh5 Rxa2 d5 
33   +3.68   03:37 172140K  h6 gxh6 e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 Nge7 Kf1 Bd4 Nxd4 Nxd4 Qb7 Ndc6 Nc7 Rg8 Nxb5 Rxg4 Qa8+ Nc8 Nd6 Ne7 Qf3 Rb4 Qxf7 Rb6 d4 h5 d5 Nxd6 exd6 Rxd6 Qf8+ Kc7 Qxe7 Rxd5 Qxh7 Re5 Kf2 a5 Qf7 Kc6 Qf6+ d6 Qf3+ Kc7 Qf7+ Kc6 Qc4+ Kd7 
34   +3.93   04:52 234139K  h6 gxh6 e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 Nge7 Kf1 Bd4 Nxd4 Nxd4 Qb7 Ndc6 Nc7 Rg8 Nxb5 Rxg4 Qa8+ Nc8 Nd6 Ne7 Qf3 Rb4 Qxf7 a6 Qf8+ Kc7 Ne8+ Kb7 Qxh6 Rb2 Qh3 Rxc2 Qxd7+ Kb8 d4 h6 d5 h5 d6 Nd5 Qe6 Rc1+ Kf2 Ncb6 d7 
35   +4.14   06:40 323080K  h6 gxh6 e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 Nge7 Kf1 Bd4 Nxd4 Nxd4 Qb7 Ndc6 Nc7 Rg8 Nxb5 Rxg4 Qa8+ Nc8 Nd6 Ne7 Qf3 Ra4 Qxf7 Rb4 Ke2 Rb6 Qf8+ Kc7 Kd2 a5 Ne8+ Kb7 Nf6 d6 Qf7 Ka7 Qxh7 dxe5 Qxh6 Ka6 Qh4 Rc6 Nd7 Rc7 Nxe5 Nb6 Qf6 Nd5 
36   +4.38   10:51 528055K  h6 gxh6 e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 Nge7 Kf1 Bd4 Nxd4 Nxd4 Qb7 Ndc6 Nc7 Rg8 Nxb5 Rxg4 Qa8+ Nc8 Nd6 Ne7 Qf3 Rb4 Qxf7 Rb6 d4 h5 Qe8+ Kc7 Qxh5 Nxd6 exd6+ Rxd6 Qc5+ Nc6 d5 Rf6+ Kg2 Kc8 dxc6 Rxc6 Qxa7 Rxc2+ Kf3 Rc6 Qa8+ Kc7 Qa5+ Kc8 Qd5 Rf6+ Kg4 h6 a4 Rg6+ Kf3 Rf6+ Ke4 Re6+ Kf5 Kd8 a5 Ke7 Qb7 
37   +4.45   14:12 701410K  h6 gxh6 e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 Nge7 Kf1 Bd4 Nxd4 Nxd4 Qb7 Ndc6 Nc7 Rg8 Nxb5 Rxg4 Qa8+ Nc8 Nd6 Ne7 Qf3 h5 Qxf7 a6 Qxh5 Rg6 Nb7+ Kc7 Nc5 d6 Nxa6+ Kb7 Nb4 dxe5 Qxe5 Nc6 Qb5+ Nb6 a3 Rf6+ Kg2 Rg6+ Kf2 Rf6+ Ke3 Re6+ Kd2 Nxb4 axb4 Kc7 Qf5 Rg6 Qe5+ Rd6 
38   +4.52   20:16   1020M  h6 gxh6 e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 Nge7 Kf1 Bd4 Nxd4 Nxd4 Qb7 Ndc6 Nc7 Rg8 Nxb5 Rxg4 Qa8+ Nc8 Nd6 Ne7 Qf3 Rb4 Qxf7 Rb1+ Ke2 Rb6 Qf8+ Kc7 Kd2 a5 Ne8+ Kb7 Nf6 d6 Qf7 Ka7 Qxh7 dxe5 Qxh6 Ka6 Qg7 Rc6 Qg5 Nd6 Qxe5 Ng6 Qg3 Ne7 Nd7 
39   +4.51   24:27   1246M  h6 gxh6 e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 Nge7 Kf1 Bd4 Nxd4 Nxd4 Qb7 Ndc6 Nc7 Rg8 Nxb5 Rxg4 Qa8+ Nc8 Nd6 Ne7 Qf3 Rb4 Qxf7 Rb1+ Ke2 Rb6 Qf8+ Kc7 Kd2 a5 Ne8+ Kb7 Nf6 d6 Qf7 Ka7 Qxh7 dxe5 Qxh6 Ka6 Qg7 Rc6 Qg5 Re6 Nd7 Rd6 Nxe5 Rd8 Qf4 Kb7 Qf7 Ka8 Nc4 Rd5 Qf6 Kb7 Ne3 
40   +4.49   29:29   1491M  h6 gxh6 e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 Nge7 Kf1 Bd4 Nxd4 Nxd4 Qb7 Ndc6 Nc7 Rg8 Nxb5 Rxg4 Qa8+ Nc8 Nd6 Ne7 Qf3 Rb4 Qxf7 Rb1+ Ke2 Rb6 Qf8+ Kc7 Kd2 h5 Ne8+ Kb8 Nf6 Kc7 Qe8 d6 Qf7 Kc6 Qxh7 dxe5 Qxh5 Kd6 Ne4+ Ke6 Qh6+ Kf7 Qh7+ Ke6 Qg7 Rb5 Qg4+ Kf7 Ng5+ Kf6 a4 Rb6 Ne4+ Kf7 Qh5+ Ke6 
41   +4.61   40:20   2068M  h6 gxh6 e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 Nge7 Kf1 Bd4 Nxd4 Nxd4 Qb7 Ndc6 Nc7 Rg8 Nxb5 Rxg4 Qa8+ Nc8 Nd6 Ne7 Qf3 h5 Qxf7 a6 Qxh5 Rf4+ Ke2 Rd4 Ke3 Rb4 Qxh7 Rb6 Qh8+ Kc7 Ne8+ Kb7 Nf6 d6 Nd7 Rc6 Kd2 dxe5 Qxe5 Rd6 Nc5+ Kb6 Ne4 Rg6 d4 Nc6 Qc5+ Kb7 d5 Ne5 d6 
42   +4.68   52:32   2707M  h6 gxh6 e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 Nge7 Kf1 Bd4 Nxd4 Nxd4 Qb7 Ndc6 Nc7 Rg8 Nxb5 Rxg4 Qa8+ Nc8 Nd6 Ne7 Qf3 Rg8 Qxf7 Rg6 Qe8+ Kc7 Nb5+ Kc6 e6 Rf6+ Kg1 Rg6+ Kh2 Rxe6 Nd4+ Kd6 Nxe6 Kxe6 Qf8 h5 Qh6+ Ke5 Qxh7 Kd6 Qxh5 Nc6 Qg4 N8e7 c4 Kc7 Qe4 Nc8 Kg3 N8e7 Qf4+ Kb7 Kg4 Kc8 
43   +4.72 1:09:51   3651M  h6 gxh6 e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 Nge7 Kf1 Bd4 Nxd4 Nxd4 Qb7 Ndc6 Nc7 Rg8 Nxb5 Rxg4 Qa8+ Nc8 Nd6 Ne7 Qf3 Rb4 Qxf7 Rb1+ Ke2 Rb6 Qf8+ Kc7 Kd2 h5 Ne8+ Kd8 Nf6+ Kc7 Qe8 d6 Qf7 Kc6 Qxh7 dxe5 Qxh5 Kd6 Ne4+ Ke6 Qh6+ Kf7 Qh7+ Ke6 Qg7 Rb5 Qg4+ Kf7 Ng5+ Kf6 a4 Ra5 c4 Rxa4 Ne4+ Kf7 Qh5+ Kf8 Nc5 Ra2+ Kc3 Kg8 Qg4+ Kf7 Qe6+ Kg7 Qxe5+ Kg6 Ne4 Kf7 Qh5+ Ke6 Qg4+ Kf7 
44   +4.87 1:57:38   6223M  h6 gxh6 e5 Ba6 Nc7+ Kd8 Nxa6 Qc3 Bc7+ Qxc7 Nxc7 Nc6 Nxa8 Nge7 Kf1 Bd4 Nxd4 Nxd4 Qb7 Ndc6 Nc7 Rg8 Nxb5 Rxg4 Qa8+ Nc8 Nd6 Ne7 Qf3 Rg6 Qxf7 a6 Nb7+ Kc7 Nc5 d6 Ne6+ Kc6 Qe8+ Kd5 Nf4+ Kxe5 Nxg6+ hxg6 Qh8+ Ke6 Qxh6 Kd7 Qf4 Nc6 Qa4 a5 Qg4+ Kc7 Qxg6 Nb6 Qf7+ Nd7 Kf2 Ne5 Qd5 a4 Qa5+ Nb6 Ke3 Nc6 Qg5 Ne5 d4 Nd5+ Ke4 

It appears that h6 is as good or better than e5.
I don't think it is just a permutation.