Die Tactical Suite, hardest with Stockfish

[Vinvin]

I selected the hardest positions from the set "Die Tactical Suite". There still 29 positions (on 100).
I ran this positions 5 times (4 times for last positions) with this settings :
30 minutes per positions, CPU i7-4.4 GHz 6 cores, 6 threads, 8GB HT, Syzygy 6 pcs.

I found 2 buggy positions in the set :

2r2rk1/1q4p1/p1bp1b2/1p2pPpQ/1P2P3/P1NB4/2P5/1K1R3R w - - 0 1
Bxb5 and Qh7 are valid solutions too !

r1b1r1k1/bp3ppp/1qn1p3/3pP3/1P3B2/P2B1N2/3Q1PPP/2R2RK1 w - - 0 1
Bf4-g5 is a valid solution too !

Here are the positions with the 5 (or 4) moves found (+timing when solution found) by Stockfish_15050918_x64_modern :

[d]rn1qr1k1/1p2bppp/p3p3/3pP3/P2P1B2/2RB1Q1P/1P3PP1/R5K1 w - - 0 1
1) Bd3xh7
Bd3xh7 * 164 Sec
Bd3xh7 * 250 Sec
Bd3xh7 * 214 Sec
Bd3xh7 * 734 Sec
Bd3xh7 * 112 Sec

[d]1rb4k/p5np/3p1rp1/1ppB4/2N2P2/1P2R1P1/P1P4P/4R1K1 w - - 0 1
2) Re3-e8
Nc4-d2
Nc4-d2
Nc4-d2
Nc4-d2
Nc4-d2

[d]1rr1b1k1/1pq1bp2/p2p1np1/4p3/P2BP3/2NB2Q1/1PP3PP/4RR1K w - - 0 1
3) Rf1xf6
Rf1xf6 * 93 Sec
Rf1xf6 * 333 Sec
Rf1xf6 * 1226 Sec
Rf1xf6 * 1669 Sec
Rf1xf6 * 248 Sec

[d]1q1r3k/3P1pp1/ppBR1n1p/4Q2P/P4P2/8/5PK1/8 w - - 0 1
6) Rd6xf6
Qe5-d4
Qe5-d4
Qe5-d4
Qe5-d4
Qe5-d4

[d]1rbr2k1/4q1p1/p2bp2p/8/R6P/3QB1P1/4PPB1/2R3K1 w - - 0 1
7) Be3xh6
Be3xh6 * 576 Sec
Be3xh6 * 160 Sec
Be3xh6 * 275 Sec
Be3xh6 * 1300 Sec
Be3xh6 * 640 Sec

[d]2r2rk1/1q4p1/p1bp1b2/1p2pPpQ/1P2P3/P1NB4/2P5/1K1R3R w - - 0 1
9) Bd3-c4
Bd3xb5
Bd3xb5
Bd3xb5
Bd3xb5
Bd3xb5

[d]r3r1k1/pp1q1p2/2p2npb/PPPp4/3Pp3/2NNPpP1/1R1B1P1K/3Q3R b - - 0 1
10) .. Kg8-g7
e4xd3
e4xd3
e4xd3
e4xd3
e4xd3

[d]6br/1KNp1n1r/2p2p2/P1ppRP2/1kP3pP/3PBB2/PN1P4/8 w - - 0 1
11) Be3xc5
Re5-e8
Re5-e8
Re5-e8
Re5-e8
Re5-e8

[d]3r2rk/5pp1/p2p1q1p/n1pPpP2/PpP1Q2P/1P3RR1/2B2PP1/6K1 w - - 0 1
12) Rg3-g5
Rg3-h3
Rg3-h3
Rg3-h3
Rg3-h3
Rg3-h3

[d]r5k1/p1pb2bp/3p3r/P1pPp1p1/2B1Pq2/1R2QPp1/1P4PP/5RBK b - - 0 1
13) .. Rh6xh2
a7-a6
a7-a6
a7-a6
a7-a6
a7-a6

[d]2r2rk1/1b3ppp/pn2p3/2qpP3/1p1Q1PP1/3B2R1/PPP1N2P/1K1R4 w - - 0 1
14) Bd3xh7
Bd3xh7 * 44 Sec
Bd3xh7 * 1655 Sec
Bd3xh7 * 478 Sec
Qd4xc5
Bd3xh7 * 876 Sec

[d]r1b2rk1/1pq2ppp/p1p1p3/2n1P3/2N2P2/3B4/PPP3PP/R2Q1RK1 w - - 0 1
18) Bd3xh7
Bd3xh7 * 0 Sec
Bd3xh7 * 325 Sec
Bd3xh7 * 171 Sec
Bd3xh7 * 103 Sec

[d]8/p4pk1/r1p1p1p1/P1PpRnPp/1P3P2/2P5/4RK2/8 w - - 0 1
19) Re5xf5
Re2-d2
Re2-d2
Re2-d2
Re2-d2

[d]r1q1rbk1/2pp1ppp/p1b5/1p1NP3/3Q4/3R2B1/PPP2PPP/5RK1 w - - 0 1
20) Nd5-f6
Nd5-f6 * 1344 Sec
Rf1-d1
Rf1-d1
Nd5-f6 * 684 Sec

[d]4q1kr/p6p/1prQPppB/4n3/4P3/2P5/PP2B2P/R5K1 w - - 0 1
21) Qd6xe5
Qd6-a3
Qd6-a3
Qd6-a3
Qd6-a3

[d]2bq1b2/1p3k2/1r1p1p1p/pNpP1PpP/P1P3P1/6B1/1P5Q/2K1R3 w - - 0 1
22) Re1-e6
Qh2-c2
Re1-e6 * 492 Sec
Re1-e6 * 169 Sec
b2-b3

[d]r2q1r2/1b2bpkp/n3p1p1/2ppP1P1/p6R/1PN1BQR1/NPP2P1P/4K3 w - - 0 1
23) Qf3-f6
b3xa4
Qf3-f6 * 1612 Sec
b3xa4
Qf3-f6 * 436 Sec

[d]r2q1rk1/2pb2b1/1p1p1n2/PN1Pp3/1BP1Pppn/8/3N1PP1/R2QRBK1 b - - 0 1
25) .. Nh4xg2
Nf6-h5
Nf6-h5
Nh4xg2 * 8 Sec
Nf6-h5

[d]1r3knr/3b1pp1/p2q3p/3p2P1/2pN3P/P1N2P2/1PPQ4/1K1RR3 w - - 0 1
26) Nc3xd5
Nc3xd5 * 45 Sec
Nc3xd5 * 21 Sec
Nc3xd5 * 0 Sec
Kb1-a1

[d]r4r1k/6qp/3R1bb1/pNp2p2/PnB1pP2/4B2P/1P3Q1K/6R1 w - - 0 1
27) Rd6xf6
Rd6xf6 * 950 Sec
Rd6xf6 * 123 Sec
b2-b3
Rd6xf6 * 851 Sec

[d]r3r2k/1pq2pp1/4b2p/3pP3/p1nB3P/P2B1RQ1/1PP3P1/3R3K w - - 0 1
28) Rf3-f6
Rf3-f6 * 118 Sec
Rf3-f6 * 88 Sec
Rf3-f6 * 263 Sec
Rf3-f6 * 315 Sec

[d]8/6k1/2p2qp1/1p1n1p2/r2P4/p1P3P1/3Q1PK1/R6R w - - 0 1
29) c3-c4
Qd2-h6
c3-c4 * 221 Sec
c3-c4 * 1672 Sec
Qd2-h6

[d]r1bq1rk1/pp2b2p/2p1pppQ/8/1n1PN2P/3B1N2/PPP2PP1/2KR3R w - - 0 1
30) Ne4-g5
Kc1-b1
Kc1-b1
Kc1-b1
Kc1-b1

[d]r1bq1rk1/p4p1p/1np3p1/3p2Pn/1p2PP2/1PbQB3/P1P1BN1P/2KR2NR b - - 0 1
31) .. Nb6-c4
Nb6-c4 * 561 Sec
Nb6-c4 * 101 Sec
Nb6-c4 * 1306 Sec
Nb6-c4 * 395 Sec

[d]1rb1nrk1/1p1qp2p/p1np1ppQ/3N1P2/2P1P3/3B1N1P/P2B2P1/R6K w - - 0 1
32) e4-e5
Nd5-b6
Nd5-b6
Nd5-b6
Nd5-b6

[d]r4qk1/5p1p/2bppnp1/2pn2N1/8/P5P1/1P1Q1PBP/1R2R1K1 w - - 0 1
33) Ng5xe6
Ng5xe6 * 11 Sec
Rb1-a1
Ng5xe6 * 3 Sec
Rb1-a1

[d]1rb1r1k1/2qn1pbp/pp1p2p1/2nP4/P1p1PP2/2N1BQNP/1PB3P1/R4R1K w - - 0 1
35) e4-e5
e4-e5 * 1551 Sec
e4-e5 * 799 Sec
Ra1-d1
Ra1-d1

[d]r3rb2/1q1n1ppk/1pp1p1np/3pP2N/PP1P4/7R/3B1PPP/2Q1NRK1 w - - 0 1
36) g2-g4
g2-g4 * 303 Sec
g2-g4 * 48 Sec
g2-g4 * 507 Sec
g2-g4 * 1457 Sec

[d]r1b1r1k1/bp3ppp/1qn1p3/3pP3/1P3B2/P2B1N2/3Q1PPP/2R2RK1 w - - 0 1
38) Bd3xh7
Bf4-g5
Bd3xh7 * 3 Sec
Bf4-g5
Bd3xh7 * 1 Sec

[Vinvin]

I'll probably add the following positions to the "Hard talkchess 2015" set.

Code: Select all

1rbr2k1/4q1p1/p2bp2p/8/R6P/3QB1P1/4PPB1/2R3K1 w - - bm Bxh6;
8/p4pk1/r1p1p1p1/P1PpRnPp/1P3P2/2P5/4RK2/8 w - - bm Rxf5;
r2q1r2/1b2bpkp/n3p1p1/2ppP1P1/p6R/1PN1BQR1/NPP2P1P/4K3 w - - bm Qf6+;
2r2rk1/1b3ppp/pn2p3/2qpP3/1p1Q1PP1/3B2R1/PPP1N2P/1K1R4 w - - bm Bxh7+; 
2bq1b2/1p3k2/1r1p1p1p/pNpP1PpP/P1P3P1/6B1/1P5Q/2K1R3 w - - bm Re6; 
r4r1k/6qp/3R1bb1/pNp2p2/PnB1pP2/4B2P/1P3Q1K/6R1 w - - bm Rxf6;
r3r2k/1pq2pp1/4b2p/3pP3/p1nB3P/P2B1RQ1/1PP3P1/3R3K w - - bm Rf6;
8/6k1/2p2qp1/1p1n1p2/r2P4/p1P3P1/3Q1PK1/R6R w - - bm c4; 
r3rb2/1q1n1ppk/1pp1p1np/3pP2N/PP1P4/7R/3B1PPP/2Q1NRK1 w - - bm g4;
1rb1r1k1/2qn1pbp/pp1p2p1/2nP4/P1p1PP2/2N1BQNP/1PB3P1/R4R1K w - - bm e5;
3r2rk/5pp1/p2p1q1p/n1pPpP2/PpP1Q2P/1P3RR1/2B2PP1/6K1 w - - bm Rg5;
r5k1/p1pb2bp/3p3r/P1pPp1p1/2B1Pq2/1R2QPp1/1P4PP/5RBK b - - bm Rxh2;
r1bq1rk1/pp2b2p/2p1pppQ/8/1n1PN2P/3B1N2/PPP2PP1/2KR3R w - - bm Neg5;
6br/1KNp1n1r/2p2p2/P1ppRP2/1kP3pP/3PBB2/PN1P4/8 w - - bm c5;
r3r1k1/pp1q1p2/2p2npb/PPPp4/3Pp3/2NNPpP1/1R1B1P1K/3Q3R b - - bm Kg7;

[Dann Corbit]

Change bm to Rxh2+ (check is missing):
[d]r5k1/p1pb2bp/3p3r/P1pPp1p1/2B1Pq2/1R2QPp1/1P4PP/5RBK b - - acd 42; acs 2595; bm Rxh2+; c0 "Aaron Summerscale - Gawain Jones, British Championship, 2009"; c3 "Rxh2"; ce 1403; id "die.093"; pm Rxh2+; pv Rxh2+ Bxh2 Qh4 Qg1 Rf8 f4 exf4 Rd3 Re8 Re1 Bxb2 Re2 Bf6 Re1 Bd4 Rxd4 cxd4 e5 f3 Re4 gxh2 Qf1 Qxe4 e6 fxg2+ Qxg2 Qxg2+ Kxg2 Ba4 Kxh2 Kg7 Kg3 Kf6 a6 h5 Be2 h4+ Kf3 c5 Bf1 Bb3 Ke4 d3 Bxd3 Rb8 Ke3 Bxd5 Bf1 Bxe6 Bd3 Rb3 Ke2 c4 Bh7 Rb2+ Kd1 Ke5 Bc2 g4 Kc1 Ra2 K;

It appears that Rd2 probably also wins. Is it clear that Rxf5 is better?
[d]8/p4pk1/r1p1p1p1/P1PpRnPp/1P3P2/2P5/4RK2/8 w - - acd 46; acs 1616; bm Rd2; c0 "http://rybkaforum.net/cgi-bin/rybkaforu ... ?tid=19187"; c3 "Rxf5"; ce 440; id "die.043"; pm Rd2; pv Rd2 Kf8 Re1 Ng7 c4 Ne8 cxd5 cxd5 Rc1 Ke7 Rb2 Kd8 Ra1 Rc6 a6 Kc7 b5 Rxc5 b6+ Kb8 bxa7+ Kxa7 Rb7+ Ka8 a7 Rc8 Rxf7 Nd6 Rg7 Ne4+ Ke3 Nc5 Rxg6 d4+ Kf3 d3 Ke3 h4 Rh6 d2 Rd1 Nb3 Rxe6 Kxa7 Rh6 Kb7 g6 Rc3+ Ke4 Rg3 f5 Kc6 Rxh4 Kd6 Rh7 Nc5+ Kf4 Rg2 Kf3;

It appears that Rh3 may also win. It it clear that Rg5 is better?
[d]3r2rk/5pp1/p2p1q1p/n1pPpP2/PpP1Q2P/1P3RR1/2B2PP1/6K1 w - - acd 46; acs 2512; bm Rh3; c0 "http://immortalchess.net/forum/showpost ... ostcount=5"; c3 "Rg5"; ce 290; id "die.034"; pm Rh3; pv Rh3 Rdf8 Rh1 h5 Rg3 Kh7 Rg5 Rh8 Rxh5+ Kg8 Rxh8+ Kxh8 g4 Qh6 g5 Qh5 Kg2 f6 Bd1 Qh7 Qg4 Nb7 Bc2 Kg8 Re1 Qh8 gxf6 Rf7 f4 Qh6 fxe5 dxe5 Rxe5 Nd6 Qg3 Qxf6 Re6 Qb2 Re2 Qf6 Qf2 Re7 Re6 Rxe6 fxe6 Qxf2+ Kxf2 Kf8 Kf3 Ke7 Kg3 Kf6 Kf4 Nb7 Ke4 Nd6+ Ke3 Nb7 Kf3 Nd6 Kg4;

[Dann Corbit]

Looking at #2, Rd2 is probably just wood weight. So never mind on that one.

[Jhoravi]

I noticed this since a long time ago that the best move is Hard to Find by the Engine after it sees another move that also wins.

[MikeGL]

Sorry, it seems I was gone for a long time and was not able to track this "Die Test Suite". Can you post the complete EPD or a URL link will do.

Thanks in advance.

[Dann Corbit]

Code: Select all

1k2rb1r/1pp3p1/p4pb1/1q6/1P1PN2p/2P2P1P/3Q2PB/R3R2K w - - bm c4; id "die.001";
1q1r3k/3P1pp1/ppBR1n1p/4Q2P/P4P2/8/5PK1/8 w - - bm Rxf6; c0 "Olafsson - Unzicker, Lugano 1970"; id "die.002";
1qrrbbk1/1p1nnppp/p3p3/4P3/2P5/1PN1N3/PB2Q1PP/1B2RR1K w - - bm Bxh7+; c0 "Georgiev-Ionescu, Constantin 1986"; id "die.003";
1r1qrbk1/pb3p2/2p1pPpp/1p4B1/2pP2PQ/2P5/P4PBP/R3R1K1 w - - bm Bxh6; c0 "Future Breeze(Naum 4.1)-Ultrapower(Rybka 3), playchess.com 2010 (analysis)"; id "die.004";
1r1rb1k1/5ppp/4p3/1p1p3P/1q2P2Q/pN3P2/PPP4P/1K1R2R1 w - - bm Rxg7+; c0 "Vincent Lejeune - hard CCC 2008 - Pos 14"; id "die.005";
1r2nrk1/5p1p/3p1Pp1/b3p1P1/8/3R2RQ/1P4BP/1KB1q3 w - - bm Rde3; c0 "devour-grandphish, League division A2"; id "die.006";
1r2r1k1/1bp1qppn/1p1p3p/p7/P1PPp2n/BBP1P1NP/4QPP1/1R2R1K1 b - - bm Nf3+; c0 "Rybka 4 vs Houdini 1.02, 2010"; id "die.007";
1r3knr/3b1pp1/p2q3p/3p2P1/2pN3P/P1N2P2/1PPQ4/1K1RR3 w - - bm Nxd5; c0 "_klf_ - bankuss [B66] KC~5f BestLogic, 06.01.2011"; id "die.008";
1r3r1k/1bq4p/p4Pp1/4p3/1p1pN3/P3bQN1/1PP5/1K1R1B1R w - - bm Bc4; c0 "Nunn-Lalic, London 1996"; id "die.009";
1r3r1k/2q1b1np/3p1pp1/pp2p1P1/5P1P/PB2B3/1PPQ1R2/1K1R4 w - - bm f5; c0 "Van Assche - Boehme, FICGS, 2010"; id "die.010";
1r3rk1/3b1p1p/pp1p1p1Q/n1q1p3/2P1P3/P1PB1N2/6PP/1R3RK1 w - - bm Nd4; c0 "Topalov vs Shirov, 2006"; id "die.011";
1rb1nrk1/1p1qp2p/p1np1ppQ/3N1P2/2P1P3/3B1N1P/P2B2P1/R6K w - - bm e5; c0 "Karacsony-Dobrei, CorrGame 2005"; id "die.012";
1rb1r1k1/2qn1pbp/pp1p2p1/2nP4/P1p1PP2/2N1BQNP/1PB3P1/R4R1K w - - bm e5; c0 "Papenin - Goze, 8th European Team Championship, ICCF, 2009"; id "die.013";
1rb4k/p5np/3p1rp1/1ppB4/2N2P2/1P2R1P1/P1P4P/4R1K1 w - - bm Re8+; c0 "Bagirov-Grigorian, USSR 1976"; id "die.014";
1rbqr1k1/2n2pb1/5np1/3Pp1B1/1pp5/2N3NP/1PB3P1/R2Q1RK1 w - - bm Nh5; c0 "Papenin - Plomp, CCO17/F board 5 2011"; id "die.015";
1rbr2k1/4q1p1/p2bp2p/8/R6P/3QB1P1/4PPB1/2R3K1 w - - bm Bxh6; c0 "Wohl-Mikhalev, CorrGame 1989"; id "die.016";
1rr1b1k1/1pq1bp2/p2p1np1/4p3/P2BP3/2NB2Q1/1PP3PP/4RR1K w - - bm Rxf6; c0 "Glek-Lingnau, Dortmund 1992"; id "die.017";
1rr2bk1/1q3ppp/bn1p4/2nPpNP1/1p2P1N1/1p2B2P/P1B2P2/2R1Q1RK w - - bm Nf6+; c0 "Handke - Graf, Bundesliga 2006-7"; id "die.018";
2b2bkr/2p1qn2/1p4r1/pNpPp1pp/2P1Pp2/P1Q2P1P/1P1R2PN/3BR1K1 b - - bm g4; c0 "Gnutov's corr game"; id "die.019";
2b2bnr/pq1p1k2/2p2pp1/8/5R2/PrNQ2B1/1P2P1BP/5RK1 w - - bm Rxf6+; c0 "Lobanov - NN, CorrGame 2010"; id "die.020";
2b2rk1/r5p1/2n1p2p/pp1pP1BQ/q1pP1P2/P1P5/R1P3P1/2N2RK1 w - - bm f5; c0 "Papenin - Bueken, WS/MN/040, 2008"; id "die.021";
2bq1b2/1p3k2/1r1p1p1p/pNpP1PpP/P1P3P1/6B1/1P5Q/2K1R3 w - - bm Re6; id "die.022";
2r1bq1k/2r2p1P/1p2pPp1/p2pP1N1/3P4/nPP5/R2Q2K1/2RN4 w - - bm Rxa3; id "die.023";
2r1qrk1/pp1bn1p1/4p2p/3pP1NR/2pP2P1/P1P1B3/2PKQP2/7R w - - bm Rxh6; c0 "rodog-acudata, 2010"; id "die.024";
2r1r1k1/1p2pp2/p2n2p1/q2PNb1p/8/1Q4PP/PP2RPB1/4R1K1 w - - bm g4; c0 "Turgut - Latas, WCCC27CT01(WS), 2007"; id "die.025";
2r1r1k1/p3pp1p/qp4pb/n5NP/P2P4/B2bP1PB/5P2/1R1QR1K1 w - - bm Nxf7; c0 "Houdini 1.5 v Rybka 4 at long time control, game 102"; id "die.026";
2r1rb1k/ppq2pp1/4b2p/3pP2Q/5B2/2PB2R1/P4PPP/1R4K1 w - - bm Rxg7; id "die.027";
2r1rbk1/1pqb1p1p/p2p1np1/P4p2/3NP1P1/2NP1R1Q/1P5P/R5BK w - - bm Nxf5; c0 "Glek-Ulibin, Wien 1998"; id "die.028";
2r1rnk1/n2b1pb1/p3p1p1/qp1pP1P1/3P1P2/1PN1B1N1/P2Q1KB1/2R4R w - - bm f5; c0 "_klf_ - Dijen [B20] KC~5f BestLogic, 11.01.2011"; id "die.029";
2r2rk1/1b3ppp/pn2p3/2qpP3/1p1Q1PP1/3B2R1/PPP1N2P/1K1R4 w - - bm Bxh7+; c0 "Wilczek - Leupold, 8th Baltic Sea Team Tournament, 2008"; id "die.030";
2r2rk1/1q4p1/p1bp1b2/1p2pPpQ/1P2P3/P1NB4/2P5/1K1R3R w - - bm Bc4+; c0 "arasan6.49"; id "die.031";
2rb3r/3b1qnk/2p1p2p/1pPpPppP/p2N1BP1/P2BP3/1PQ2P1R/6RK w - - bm Bxg5; c0 "Lyukmanov - Savin (Russian Championship (Semifinal-10-1)), 2010"; id "die.032";
3r2k1/2qrbb2/pp3pp1/2pnpn1p/P1N1N2P/1PPP1BP1/RBQ2P2/R5K1 b - - bm Nf4; id "die.033";
3r2rk/5pp1/p2p1q1p/n1pPpP2/PpP1Q2P/1P3RR1/2B2PP1/6K1 w - - bm Rg5; id "die.034";
4k2r/1b1qbppp/p2p4/2n1pPP1/1rBNP1Q1/1PN5/2P4P/2KR2R1 w k - bm Bxf7+; c0 "Barnett - Trauner, Wch8 sf1 corr ICCF, 1972"; id "die.035";
4q1kr/p6p/1prQPppB/4n3/4P3/2P5/PP2B2P/R5K1 w - - bm Qxe5; id "die.036";
4qrk1/3nppb1/R1Np2p1/3P2P1/1Pr5/4B3/5Q1P/5R1K w - - bm Ra8; c0 "Benjamin - Xu Jun, Seattle 2001"; id "die.037";
4r1k1/1bq2r1p/p2p1np1/3Pppb1/P1P5/1N3P2/1R2B1PP/1Q1R2BK w - - bm c5; c0 "YeJiangchuan-Lutz, Batumi 2001"; id "die.038";
4rr1k/pp1b2b1/2p4p/6pn/3PBp1q/P1N1P2P/1P1QNPP1/3RR1K1 b - - bm Bxh3; c0 "Dutra - Papenin, WCCC32PR11, 2008"; id "die.039";
5b2/p2k1p2/P3pP1p/n2pP1p1/1p1P2P1/1P1KBN2/7P/8 w - - bm Nxg5; c0 "Anand-Shirov 2000"; id "die.040";
6br/1KNp1n1r/2p2p2/P1ppRP2/1kP3pP/3PBB2/PN1P4/8 w - - bm Bxc5+; c0 "Der brillante Schachzug 065 – Matt in 22, Van Essen 2005"; id "die.041";
8/6k1/2p2qp1/1p1n1p2/r2P4/p1P3P1/3Q1PK1/R6R w - - bm c4; c0 "Houdini - Rybka TCEC, 02.2011"; id "die.042";
8/p4pk1/r1p1p1p1/P1PpRnPp/1P3P2/2P5/4RK2/8 w - - bm Rxf5; id "die.043";
kr6/p1q5/Bpb1pP2/2rp4/P2Q2P1/R1P3P1/2P3K1/1R6 b - - bm Rc4; c0 "Tanis - Papenin, WCCC32PR11, 2008"; id "die.044";
r1b1k1r1/pp3p1p/2n2Pp1/q3p3/2Bp3Q/8/P3NPPP/R4RK1 w q - bm Bxf7+; c0 "Sanchez Romero - Panelo Munoz, Barbera del Valles op, 2005"; id "die.045";
r1b1k3/2q1ppb1/2p2n2/3p1PBB/2nP3P/Pp5N/1P2Q1P1/2KR3R b q - bm Rxa3; c0 "Sax,G (2505)-Kestler,H (2410)/Nice 1974"; id "die.046";
r1b1nrk1/1pq1n1p1/p3p2p/4Pp2/2B4Q/2N2N2/PPP4P/1K1R2R1 w - - bm Qxh6; c0 "Nigel Short vs Petar Velikov 1987"; id "die.047";
r1b1r1k1/bp3ppp/1qn1p3/3pP3/1P3B2/P2B1N2/3Q1PPP/2R2RK1 w - - bm Bxh7+; c0 "Houdini 1.5 w32 - GullChess 1.2 w32, swcr-32-2, A3, 2011"; id "die.048";
r1b1r1k1/p2q1ppp/np2n3/3p1NBQ/8/6PB/P4P1P/1R2R1K1 w - - bm Bf6; c0 "Sandipan-Tiviakov, Ottawa 2007"; id "die.049";
r1b2r1k/4qp1p/p2ppb1Q/4nP2/1p1NP3/2N5/PPP4P/2KR1BR1 w - - bm Nc6; c0 "Kholmov-Bronstein, Kiew 1964"; id "die.050";
r1b2r2/p4k2/1p3p2/n3qPpN/3pP3/3B1R2/P2Q2P1/2R3K1 w - - bm Nxf6; c0 "Topalov-Anand 2010"; id "die.051";
r1b2rk1/1pp2ppp/2n2q2/p1b1p3/2N1Pn2/1BP1BN1P/PPQ2PPK/R4R2 b - - bm Nxg2; id "die.052";
r1b2rk1/1pq2ppp/p1p1p3/2n1P3/2N2P2/3B4/PPP3PP/R2Q1RK1 w - - bm Bxh7+; c0 "Ciraev - Fallein, 1974"; id "die.053";
r1b2rk1/pp3p1p/2n1pQp1/q3P3/3B4/P1PB4/6PP/3R1RK1 w - - bm Bxg6; c0 "Winckelmann-Engel, CorrGame 1996"; id "die.054";
r1b2rk1/pp4pp/q3pp2/n1n1N2Q/2p1P3/P1N3P1/1P3PBP/3R1RK1 w - - bm Rd8; c0 "Korobov - Vocaturo, Aeroflot Open 2011 A"; id "die.055";
r1b2rk1/ppp2p2/2n1qbp1/4N2p/1P2QP1P/3B4/PBP3P1/2KR3R w - - bm g4; c0 "Keres - Petrovs, Moskau ch-URS, 1940"; id "die.056";
r1b3k1/pp1n3p/2pbpq1r/3p4/2PPp1p1/PP2P1P1/1BQN1P1P/3RRBK1 b - - bm Rxh2; c0 "Vincent Lejeune - hard CCC 2008 - Pos 7"; id "die.057";
r1b3r1/ppk1qp2/3p1n1R/2pPn3/2P1p3/1QP1P1BP/P5P1/1R1B1NK1 b - - bm Nf3+; c0 "Papenin - LeBled, RCCA-Bronze 2008"; id "die.058";
r1b4k/pp2qnr1/3p4/NP1Qp2p/P1B1PpP1/5P2/6P1/3R1RK1 b - - bm Qh4; c0 "Hovde-Timmerman, 25 Years Jubilee cr 1991"; id "die.059";
r1bq1k1r/4npp1/p1nNp2p/bp1pP2P/3P4/P4N2/2B2PP1/R1BQ1K1R w - - bm Ng5; c0 "Forssen-Eriksson, CorrGame 1978"; id "die.060";
r1bq1rk1/4bpp1/ppp2n1p/4p1B1/P3N2Q/8/BPP2PPP/R3R1K1 w - - bm Bxh6; c0 "Shirov - Vorobiov, 16th TCh-RUS Premier, 2009"; id "die.061";
r1bq1rk1/p3bppp/2p1p3/2npP3/5B2/3B4/PPPN1PPP/R2QR1K1 w - - bm Bxh7+; c0 "Campora - Morovic, 1982"; id "die.062";
r1bq1rk1/p4p1p/1np3p1/3p2Pn/1p2PP2/1PbQB3/P1P1BN1P/2KR2NR b - - bm Nc4; c0 "Nielsen-Malmdin, CorrGame 1995"; id "die.063";
r1bq1rk1/pp2b2p/2p1pppQ/8/1n1PN2P/3B1N2/PPP2PP1/2KR3R w - - bm Neg5; id "die.064";
r1bq1rk1/pp2bppp/1n2p3/3pP3/8/2RBBN2/PP2QPPP/2R3K1 w - - bm Bxh7+; c0 "Trent - Deslandes Cap d'Agde CCAS op 2008"; id "die.065";
r1bq1rk1/pp4bp/2np4/2p1p1p1/P1N1P3/1P1P1NP1/1BP1QPKP/1R3R2 b - - bm Bh3+; c0 "Vincent Lejeune - hard CCC 2008 - Pos 8"; id "die.066";
r1bq2k1/pp4r1/3p1nnb/3Pp2p/PP2Ppp1/2NN1P2/2R1BBPP/3Q1R1K b - - bm g3; c0 "Podezd - Gildar, bestlogic.ru, 2010"; id "die.067";
r1br2k1/1p3pp1/p1nBp2p/q3n3/2P1N1P1/4Q3/3RB2P/5RK1 w - - bm h4; c0 "Riccio Eros 2477 - Wayne Lowrance 2537, FICGS 2010"; id "die.068";
r1q1nrk1/pb2n2p/3bppp1/3pN3/1ppP1PPB/2P1PN1Q/PPB2R1P/6RK w - - bm f5; id "die.069";
r1q1rbk1/2pp1ppp/p1b5/1p1NP3/3Q4/3R2B1/PPP2PPP/5RK1 w - - bm Nf6+; c0 "Marjanovic, S.- Yilmaz, T., Pucarevo (zt) 1987"; id "die.070";
r1r3k1/1bq1bpp1/p1nppn2/1p4Bp/4PP1Q/PNNB4/1PP3PP/2KRR3 w - h6 bm g4; c0 "Trofimov - Kurdyukov, ICCF 2009"; id "die.071";
r1r3k1/pb2ppbp/qp4p1/n7/3PP3/1B2QN2/3B1PPP/1R2R1K1 w - - bm Bxf7+; c0 "Covax 1.13"; id "die.072";
r2q1r2/1b2bpkp/n3p1p1/2ppP1P1/p6R/1PN1BQR1/NPP2P1P/4K3 w - - bm Qf6+; id "die.073";
r2q1rk1/1p1bb2p/n3pp2/n7/pNPp1BPN/P2P4/1P4BP/1R1QR1K1 w - - bm Nd5; c0 "Ivanchuk-Alekseev, Jermuk 2009"; id "die.074";
r2q1rk1/2pb2b1/1p1p1n2/PN1Pp3/1BP1Pppn/8/3N1PP1/R2QRBK1 b - - bm Nxg2; c0 "Siffon - Vitamix"; id "die.075";
r2q1rk1/pb1pbpp1/np3n1p/1N6/2p5/P5N1/1PB2PPP/R1BQ1RK1 w - - bm Bxh6; c0 "Bronstein vs Keres, Goteborg 1995"; id "die.076";
r2q2k1/1bp1rp2/p1np1n2/1p1N2N1/P2bP3/1B6/1P3PPP/R2QR1K1 w - - bm Re3; c0 "Arnlind-Zagorovsky, CorrGame 1984"; id "die.077";
r2qk2r/ppp1b1pp/2n1p3/3pP1n1/3P2b1/2PB1NN1/PP4PP/R1BQK2R w KQkq - bm Nxg5; c0 "Smaguine-Sahovic, Bienne 1990"; id "die.078";
r3k2r/1bqpnpbp/p1n1p1p1/1p5P/4P3/1NN1B3/PPPQ1PP1/2KR1B1R w kq - bm Bxb5; c0 "voronn009"; id "die.079";
r3kb1r/1b1n2p1/p3Nn1p/3Pp3/1p4PP/3QBP2/qPP5/2KR1B1R w kq - bm Qg6+; c0 "Morozevich vs. Vachier-Lagrave from Biel 2009"; id "die.080";
r3n3/3b2kp/1qNp2p1/1p1Pp2n/1P2Pp2/3B1N1P/1Q3PP1/2R3K1 w - - bm Rc5; c0 "Tal-Hjartarson, Reykjavik 1986"; id "die.081";
r3qrk1/2p1bppp/p3n3/1p2P3/4N3/4BQ2/PP3PPP/R2R2K1 w - - bm Nf6+; c0 "Karpov-Kortschnoj 1981"; id "die.082";
r3r1k1/pbq1ppbp/1pp2np1/4N3/3P4/2P5/PPB1QPPP/R1B1R1K1 w - - bm Nxf7; c0 "Tal - NN, simultan, 1990"; id "die.083";
r3r1k1/pp1q1p2/2p2npb/PPPp4/3Pp3/2NNPpP1/1R1B1P1K/3Q3R b - - bm Kg7; c0 "Nikolic-Fischer (Vinkovci, 1968)"; id "die.084";
r3r2k/1pq2pp1/4b2p/3pP3/p1nB3P/P2B1RQ1/1PP3P1/3R3K w - - bm Rf6; c0 "Houdini 1.5 - Rybka 4, LTC match, 2011"; id "die.085";
r3rb2/1b3pk1/1q1p3p/1p1P1pN1/1np1P3/3n2RP/1P1Q1PP1/1BB2RK1 w - - bm Qd1, Qe2; c0 "Schuster-Janosi, CorrGame 2007"; id "die.086";
r3rb2/1q1n1ppk/1pp1p1np/3pP2N/PP1P4/7R/3B1PPP/2Q1NRK1 w - - bm g4; c0 "Papenin - Zhak, ICCF 2009"; id "die.087";
r4qk1/5p1p/2bppnp1/2pn2N1/8/P5P1/1P1Q1PBP/1R2R1K1 w - - bm Nxe6; c0 "Papenin - Henri, WCCC32PR11 ICCF, 2008"; id "die.088";
r4r1k/6qp/3R1bb1/pNp2p2/PnB1pP2/4B2P/1P3Q1K/6R1 w - - bm Rxf6; c0 "_klf_ - nucler, bestlogic.ru, 2010"; id "die.089";
r4rk1/1pqb1pp1/pn2p2p/b3P3/P4Q1B/1B3N2/1P3PPP/1K1R3R w - - bm Bf6; c0 "Savchenko - Smagin, 1992"; id "die.090";
r4rk1/pp3pq1/1n2p1p1/6Bp/3PQ3/7R/PP3PPP/5RK1 w - - bm g4; c0 "Loginov - Kruger, ICCF 2011"; id "die.091";
r5k1/1qrnb1p1/3p2Pp/3Pp3/pp2N1R1/3QBP2/PPP5/1K1R4 w - - bm Bxh6; c0 "Brain twister, nr 61 by Anton Stadlhofer"; id "die.092";
r5k1/p1pb2bp/3p3r/P1pPp1p1/2B1Pq2/1R2QPp1/1P4PP/5RBK b - - bm Rxh2+; c0 "Aaron Summerscale - Gawain Jones, British Championship, 2009"; id "die.093";
rn1qk2r/p2nbp2/1p2p1p1/2ppP1Np/3P1PP1/P1N1B2Q/1PP4P/R3KR2 w Qkq - bm Nxf7; c0 "Vincent Lejeune - hard CCC 2008 - Pos 4"; id "die.094";
rn1qr1k1/1p2bppp/p3p3/3pP3/P2P1B2/2RB1Q1P/1P3PP1/R5K1 w - - bm Bxh7+; c0 "01. Polugaevsky-Torre (London) 1984"; id "die.095";
rn2rbk1/pp3q1p/2p1b1p1/8/3P1Bp1/2PB4/PPQ1NP2/2KR3R w - - bm Rxh7; c0 "Pluto (C) - Nickel, CSS-CFC Computermatch (Analyse), 2003"; id "die.096";
rn3rk1/1p2ppb1/2p3pp/p2qPb2/1n1PN2B/3B4/PPPQN1PP/2KR1R2 w - - bm Rxf5; c0 "Sveshnikov - Ibragimov, Ljubljana op 7th, 1996"; id "die.097";
rnb1k1nr/p4ppp/2p5/1p2P3/1qB5/2N1BN2/P1PQ2PP/4K2R w Kkq - bm Bxf7+; c0 "arasan7.2"; id "die.098";
rnbqk2r/pp1pbppp/2p5/8/2BP1p2/2P5/P1P1N1PP/R1BQ1RK1 w kq - bm Bxf7+; c0 "Mungo-Arasan, ICC 2010"; id "die.099";
rqb1rnk1/5pb1/p1npp1p1/1p4Pp/4PP1Q/PNN1B2R/1PP1B2P/5RK1 w - - bm Bxh5; c0 "49. Smirnov-Kurnosov (Istanbul) 2004"; id "die.100";

[MikeGL]

Thanks a lot for the EPD Dann.
Nice new positions to test our beloved engines.

regards,

[Vinvin]

It appears that Rh3 may also win. It it clear that Rg5 is better?
[d]3r2rk/5pp1/p2p1q1p/n1pPpP2/PpP1Q2P/1P3RR1/2B2PP1/6K1 w - - acd 46; acs 2512; bm Rh3; c0 "http://immortalchess.net/forum/showpost ... ostcount=5"; c3 "Rg5"; ce 290; id "die.034"; pm Rh3; pv Rh3 Rdf8 Rh1 h5 Rg3 Kh7 Rg5 Rh8 Rxh5+ Kg8 Rxh8+ Kxh8 g4 Qh6 g5 Qh5 Kg2 f6 Bd1 Qh7 Qg4 Nb7 Bc2 Kg8 Re1 Qh8 gxf6 Rf7 f4 Qh6 fxe5 dxe5 Rxe5 Nd6 Qg3 Qxf6 Re6 Qb2 Re2 Qf6 Qf2 Re7 Re6 Rxe6 fxe6 Qxf2+ Kxf2 Kf8 Kf3 Ke7 Kg3 Kf6 Kf4 Nb7 Ke4 Nd6+ Ke3 Nb7 Kf3 Nd6 Kg4;

Play Rg5 on the board, you'll quickly convinced
FEN: 3r2rk/5pp1/p2p1q1p/n1pPpP2/PpP1Q2P/1P3RR1/2B2PP1/6K1 w - - 0 1

Code: Select all

Stockfish_15051822_x64_modern:
...
 34/60	02:58	 2.038.680k	11.391k	+2,83	1.Rh3 Nb7 2.g4 g5 3.fxg6 Qxg6 4.Qxg6 fxg6 5.Rf7 Rg7 6.Rf6 h5 7.Rg3 hxg4 8.Rxg4 Na5 9.Kf1 Nb7 10.Bxg6 Rgg8 11.Re6 Rg7 12.h5 Rdg8 13.Ke2 Na5 14.Rg3 Nb7 15.Rf6 Rd8 16.h6 Re7 17.Bc2 Rb8 18.Rg5 Rbe8 19.Rgg6 Rh7 20.Ke3 Rd8
 34/60	02:58	 2.038.680k	11.391k	+2,98	1.Kf1 Rgf8 2.Rh3 h5 3.Rhg3 Kh7 4.Rg5 Rh8 5.Rg6 Nxb3 6.Ke1 Nd4 7.Rxf6 gxf6 8.Rg3 Rdg8 9.Rxg8 Kxg8 10.Bd1 Kf8 11.a5 Ke7 12.Kd2 Kd7 13.Bc2 Ke7 14.g3 Kd7 15.Ba4+ Ke7 16.Bd1 Kf8 17.Bc2 Ke7 18.Ba4 b3 19.Kc1
 34/60	02:58	 2.038.680k	11.391k	+4,99	1.Rg5 Nxc4 2.bxc4 Rb8 3.Rh5 b3 4.Bxb3 g5 5.hxg5 Rxg5 6.Rh1 Kg8 7.Bc2 Kg7 8.Rfh3 Rh8 9.R1h2 Qd8 10.g3 Qf6 11.Kg2 h5 12.Qe2 a5 13.Rh1 Qd8 14.Bd3 Rh6 15.Rb1 Kf8 16.Rh4 f6 17.Rb7 Rg7 18.Rxg7 Kxg7 19.Rxh5 Rxh5 20.Qxh5 Qh8 21.Qg4+ Kf8