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Subject: Some fairly careful analysis of some of the more difficult ECM problems

Author: Terry McCracken

Date: 16:36:17 05/05/02

Go up one level in this thread


On May 05, 2002 at 18:11:53, Dann Corbit wrote:

The ones with node counts are by Crafty with a time control of 30 minutes.
The ones without node counts are Chess Tiger 14 at one hour.

[D]1k1r2r1/p1p3q1/2p2p2/3pn3/1P1b2bB/1QN5/P4PPP/1R2RBK1 b - - acd 14; acn
791289919; acs 1802; bm Nf3+; ce 854; id "ECM.1457"; pv Nf3+ Kh1 Qh6 g3 Nxh4 Qb2
Qf4 Bg2 Bf3 Kg1 Nxg2 Re6 Nh4 Rxc6;
[D]1r1qr1k1/5p1p/1n2p1p1/pp1pP1P1/2pP1BB1/PnP3P1/1P3PK1/1R1Q3R w - - acd 16; acn
1016736341; acs 1801; bm Rxh7; ce 607; id "ECM.1601"; pv Rxh7 Kf8 Qh1 Nc8 Bf5
exf5 Qh6+ Ke7 e6 Kxe6 Qxg6+ Kd7 Bxb8 Re7 Rxf7 Rxf7;
[D]1r3rk1/6p1/p1pb1qPp/3p4/4nPR1/2N4Q/PPP4P/2K1BR2 b - - acd 14; acn 978114568;
acs
1801; bm Rxb2; ce -33; id "ECM.1229"; pv Be5 Qd3 Nxc3 Bxc3 Bxc3 Qxc3 Qxc3 bxc3
Rbe8 Kd2 Re4 Re1 Rexf4 Rxf4 Rxf4 Re8+ Rf8 Re7;
[D]1r3rk1/6p1/p1pb1qPp/3p4/4nPR1/2N4Q/PPP4P/2K1BR2 b - - acd 14; bm Rxb2; ce 80;
id
"ECM.1229"; pv Rxb2 Nxe4 dxe4 Bc3 Ba3 Bxf6 Rb3+ Kd1 Rxh3 Rh4 Rxh4 Bxh4 Rb8 f5
Rb1+ Ke2 Bc1;
[D]1r5r/3b1pk1/3p1np1/p1qPp3/p1N1PbP1/2P2PN1/1PB1Q1K1/R3R3 b - - acd 14; acn
911354779; acs 1802; bm Nxg4; ce 715; id "ECM.949"; pv Nxg4 fxg4 Bxg4 b4 axb3
Qxg4 Rh2+ Kxh2 Qf2+ Kh1 Bxg3 Qh3 Rh8 Qxh8+ Kxh8 Re2 Qxe2 Bxb3 Qxe4+;
[D]1rb1r1k1/p1p1qppp/2pb4/8/2P3n1/4P1P1/PB2BP1P/R1QN1RK1 b - - acd 14; acn
919512869; acs 1802; bm Nxh2; ce 55; id "ECM.1533"; pv Nxh2;
[D]1rb1r1k1/p1p1qppp/2pb4/8/2P3n1/4P1P1/PB2BP1P/R1QN1RK1 b - - acd 17; bm Nxh2;
ce
158; id "ECM.1533"; pv Nxh2 c5 Nxf1 cxd6 Nxg3 fxg3 cxd6 Qd2 Qg5 Kg2 Qh6 g4 Bb7
Bf3 c5 Bxb7 Rxb7 Qd5;
[D]2k4r/1pp2ppp/p1p1bn2/4N3/1q1rP3/2N1Q3/PPP2PPP/R4RK1 w - - acd 15; acn
951831796;
acs 1801; bm Nd5; ce 157; id "ECM.952"; pv Nd5 Bxd5 c3 Rxe4 Qa7 Rxe5 cxb4 Nd7
Qd4 f6 Rfe1 Rhe8 Rxe5 Nxe5 f4 Ng4 a4;
[D]2kr2r1/2pqbp1p/p1n1b3/1P1pP3/4n3/1BP1BN2/1P4PP/RN1Q1RK1 b - - acd 14; acn
872957292; acs 1799; bm Bh3; ce 0; id "ECM.1426"; pv Bh3 Ne1 Bxg2 Nxg2 Rxg2+
Kxg2 Rg8+ Kh1 Ng3+ Kg1 Ne4+ Kh1;
[D]2kr3r/pp3p1p/2b1p3/q3Q3/5P2/2P1B3/P1P3PP/1R3RK1 b - - acd 14; acn 1097260321;
acs 1802; bm Rhg8; ce 0; id "ECM.1335"; pv Rhg8 Rf2 Qa4 Re1 Rd5 Qf6 Qe4 Kf1 Qc4+
Kg1 Qe4;
[D]2r1r1k1/pp1nbpp1/4pn1p/q3NN1P/P1pP1B2/2P5/1PQ2PP1/R3R1K1 w - - acd 15; acn
881359710; acs 1801; bm Nxg7; ce 41; id "ECM.1227"; pv Nxe7+ Rxe7 Qd1 Ree8 Re3
Qd8 Qf3 Nd5 Re4 Nxf4 Qxf4 Nxe5 Rxe5 Qf6 Qe4 Rc6 Re1;
[D]2r1r1k1/pp1nbpp1/4pn1p/q3NN1P/P1pP1B2/2P5/1PQ2PP1/R3R1K1 w - - acd 18; bm
Nxg7;
ce 16; id "ECM.1227"; pv Nxe7+ Rxe7 Qd1 Qb6 Qe2 Nxe5 Bxe5 Rd7 Bxf6 gxf6 Qd2 Kh7
Re3 Rd5 Rf3 f5 Qe2 Rg8 a5;
[D]2rq1rk1/pp1bnpbp/4p1p1/3pP1N1/3P2Q1/2PB4/P4PPP/R1B1R1K1 w - - acd 17; acn
839415994; acs 1801; bm Nxh7; ce 30; id "ECM.1622"; pv Bd2 h6 Nf3 b5 Qh3 h5 Ng5
a6 Qf3 Qc7 Rac1 Bc6 Bf4 Nf5 a3 h4;
[D]2rq1rk1/pp1bnpbp/4p1p1/3pP1N1/3P2Q1/2PB4/P4PPP/R1B1R1K1 w - - acd 18; bm
Nxh7;
ce 148; id "ECM.1622"; pv Nxh7 Kxh7 Qh4+ Kg8 Bg5 Rxc3 Bxe7 Qc7 Bxf8 Bxf8 Bf1 Bc6
Re3 Bb4 Rxc3 Bxc3 Rc1 Qa5;
[D]3r1qk1/5p1p/4b1pP/1pRp4/1P1Q4/r5P1/5P2/4RBK1 w - - acd 17; acn 959656415; acs
1801; bm Rxe6; ce 0; id "ECM.1448"; pv Rxe6 fxe6 Rc7 Qxh6 Qf6 Qf8 Qxe6+ Kh8 Qe5+
Kg8 Bg2 Rd3 Qe6+ Kh8 Qe5+ Kg8;
[D]3r1r2/1b4bk/p1n3pp/1p2p3/4P3/q1P1QNB1/B4RPP/5RK1 w - - acd 15; acn 908398261;
acs 1800; bm Bh4; ce -18; id "ECM.1376"; pv Bh4 Rde8 Bd5 Qd6 Qb6 Qd7 Bg3 Rc8
Nxe5 Nxe5 Bxb7 Rxf2 Rxf2 Rb8 Qc5 Rxb7 Bxe5 Bxe5 Qxe5;
[D]3r1rk1/pbqn1pp1/1pp2n1p/2b1p1B1/P1B1P2N/2N4P/1PP1QPP1/3R1RK1 w - - acd 15;
acn
927003104; acs 1799; bm Rxd7; ce 191; id "ECM.1265"; pv Rxd7 Qxd7 Bxf6 gxf6 Qh5
Qd2 Nf3 Qf4 Kh1 Bxf2 Rxf2 Qg3 Kg1 Qg7 Qf5;
[D]4r3/Q2bppkp/3p2p1/3Nn3/4P3/6PP/1qr2PB1/R3R1K1 b - - acd 14; acn 1176958353;
acs
1801; bm Ra8; ce 459; id "ECM.1093"; pv Ra8 Qxa8 Rxf2 Bh1 Rf3 Bg2 Rxg3 Nf4 Nf3+
Kf1 Rxg2 Re2 Rg1+ Kf2 Qd4+ Kxf3 Rxa1;
[D]5r1k/ppp2qnp/1n1p1N1Q/3Ppb2/2P4P/7B/PP6/2KR2R1 w - - acd 16; acn 954524587;
acs
1802; bm Nxh7; ce 184; id "ECM.1604"; pv Nh5 Nxh5 Rdf1 Nf4 Bxf5 Ne2+ Kc2 Nxg1
Be4 Nd7 Rxf7 Rxf7 Qe3 Rf4 Bd3 Nf3 Qxa7;
[D]5r1k/ppp2qnp/1n1p1N1Q/3Ppb2/2P4P/7B/PP6/2KR2R1 w - - acd 18; bm Nxh7; ce 340;
id
"ECM.1604"; pv Nxh7 Bxh7 Rdf1 Qe7 Rxf8+ Qxf8 Bf5 Qg8 Bxh7 Qxh7 Qf6 Nd7 Qd8+ Qg8
Qxd7 Qf8 Qxc7;
[D]6k1/p4pq1/2n1p1p1/1p1pP1N1/3P1QPP/8/P3K3/8 w - - acd 18; acn 961605008; acs
1800; bm Qc1; ce 42; id "ECM.1176"; pv Qc1 Nd8 Qc7 Qf8 h5 gxh5 gxh5 Kg7 Kf3 Qe8
h6+ Kg6 Kf4 Qf8 Qc2+ f5 exf6+ Kh5 Qe2+ Kxh6 Qh2+ Kg6 Qc2+ Kh5 Qh7+ Qh6;
[D]8/p3q1kp/1p2Pnp1/3pQ3/2pP4/1nP3N1/1B4PP/6K1 w - - acd 17; acn 949919782; acs
1802; bm Ba3; ce 380; id "ECM.1084"; pv Ba3 Qe8 Qc7+ Kg8 Be7 Kg7 Qxa7 Nd2 Bd8+
Kf8 Bxf6 Qxe6 Be5 h5 Qa2 Nb3 Qe2;
[D]b3r3/q2B2k1/3Q2p1/1p5p/3pP3/5P2/1p4PP/5RK1 b - - acd 16; acn 896853738; acs
1801; bm d3+; ce 438; id "ECM.1080"; pv d3+ Kh1 Qf2 Rb1 Qc2 Qd4+ Kh6 Qe3+ Kh7
Qg1 Rd8 Bxb5 d2 Be2 d1=Q Rxd1 Qxd1 Bxd1 b1=Q Be2;
[D]k3r3/pR5p/PppR1p1p/4nP2/1PP5/8/4B1rP/2K5 w - - acd 15; acn 946665790; acs
1802;
bm Re7; ce 264; id "ECM.1151"; pv Re7 Rgg8 Rxe8+ Rxe8 Rxf6 Kb8 Rxh6 Rf8 Rxh7
Rxf5 Rb7+ Ka8 Re7 Kb8 h4 c5 bxc5 bxc5 Rb7+ Ka8 h5;
[D]r1b2r1k/ppppq1pp/2n1n3/6N1/2B2P2/4B3/PPP3PP/R2Q1RK1 w - - acd 14; acn
905387002;
acs 1800; bm Nxh7; ce 141; id "ECM.1612"; pv Qh5 g6 Qh6 Qg7 Qxg7+ Kxg7 Bd2 Ned4
Bc3 Kh6 Bxd4 Nxd4 Rae1 Nf5 Rf3 Nh4 Rf2;
[D]r1b2r1k/ppppq1pp/2n1n3/6N1/2B2P2/4B3/PPP3PP/R2Q1RK1 w - - acd 15; bm Nxh7; ce
148; id "ECM.1612"; pv Nxh7 Kxh7 Qh5+ Kg8 f5 d6 Rf3 Ne5 Rh3 Nxc4 fxe6 Bxe6 Bg5
Qxg5 Qxg5 Bxh3 Qd5+ Rf7;
[D]r1b2rk1/pp4bp/2p3p1/4q2n/NQPN1p1P/1P5n/P3PPB1/2BRRK2 b - - acd 12; acn
918106562; acs 1800; bm f3; ce 39; id "ECM.1438"; pv Qc7 Qc5 Rf7 Nf3 Bf5 Bb2 b6
Qd6 Bxb2 Nxb2 Re8 Bxh3 Qxd6 Rxd6 Bxh3+;
[D]r1b2rk1/pp4bp/2p3p1/4q2n/NQPN1p1P/1P5n/P3PPB1/2BRRK2 b - - acd 15; bm f3; ce
214; id "ECM.1438"; pv Nxf2 Kxf2 f3 Bxf3 Qg3+ Ke3 Qf4+ Kd3 Qxd4+ Kc2 Bf5+ e4
Qf2+ Qd2 Qxf3 exf5 Qxf5+;
[D]r1b3k1/3nqp1p/p1n1p1pP/3pP1N1/Pp3QN1/1Pr3P1/2PR1P2/4RBK1 w - - acd 14; acn
944852504; acs 1800; bm Rxd5; ce 237; id "ECM.1403"; pv Rxd5 exd5 e6 fxe6 Rxe6
Qf8 Qxf8+ Kxf8 Nxh7+ Kg8 Ngf6+ Nxf6 Nxf6+ Kf7 Re8 Bg4 h7 Rxe8 Nxe8 Rxg3+ fxg3;
[D]r1bn1rk1/pp3p1p/6p1/2bR2N1/2B2B2/q1P1P3/2Q2PPP/4K2R w K - acd 15; acn
904477166;
acs 1801; bm Nxh7; ce 182; id "ECM.1053"; pv Nxh7 Be6 Nxf8 Bxf8 O-O Bxd5 Bxd5
Kh7 Rb1 Qe7 Qb2 Kg8 Bxb7 Nxb7 Qxb7;
[D]r1bq1rk1/pp2bp1p/2p2np1/3p2B1/3P4/2NQ2N1/PPP2PPP/4RRK1 w - - acd 15; acn
972926308; acs 1800; bm Rxe7; ce 65; id "ECM.1068"; pv Qe2 Be6 f4 Re8 Qd3 Nd7
Bxe7 Rxe7 f5 Bxf5 Nxf5 Rxe1 Rxe1 gxf5 Qxf5 Qh4 Qf2;
[D]r1bq1rk1/pp2bp1p/2p2np1/3p2B1/3P4/2NQ2N1/PPP2PPP/4RRK1 w - - acd 17; bm Rxe7;
ce
24; id "ECM.1068"; pv f4 Qd7 f5 Bd8 Qf3 b6 Rf2 Bb7 fxg6 fxg6 Nge4 dxe4 Nxe4 c5
Bxf6 Qe6 Qd3 c4 Qe3;
[D]r1r3kb/1pqbpp2/p2p1npB/n7/3NP3/1BN2P2/PPPQ2P1/2KR3R w - - acd 13; acn
904671684;
acs 1801; bm Bf8; ce 211; id "ECM.1377"; pv Bf8 Nh5 Bxe7 Be6 Qg5 Bxb3 axb3 Qc5
Qxc5 dxc5 Nde2 Bxc3 Nxc3 Nf4;
[D]r2q1rk1/p5pp/bn1p1p2/2pP4/1bP1NP2/3B1R2/PBQ3PP/R5K1 w - - acd 13; acn
1014125094; acs 1805; bm Ng5; ce 404; id "ECM.1354"; pv Ng5 h6 Ne6 Qe7 a3 Ba5
Rg3 Kh8 Nxf8 Rxf8 Rb1 Re8;
[D]r2q3r/2pkb1p1/p2p1n2/4p1p1/Pp2P1P1/1QP5/1P1P2PP/RNB2RK1 b - - acd 14; acn
858152469; acs 1802; bm Rxh2; ce -83; id "ECM.1621"; pv Qb8 h3 Qa7+ d4 bxc3 bxc3
exd4 Re1 Qc5 a5 Kd8 Ra4 dxc3+ Be3 Qb5 Qc2;
[D]r2q3r/2pkb1p1/p2p1n2/4p1p1/Pp2P1P1/1QP5/1P1P2PP/RNB2RK1 b - - acd 17; bm
Rxh2;
ce 16; id "ECM.1621"; pv Nxg4 h3 Nf6 d4 g4 dxe5 dxe5 Rd1+ Bd6 cxb4 gxh3 gxh3 Qg8
Qf3 Rf8 Nc3 Qh7 Qe2 Qh4;
[D]r2qrbk1/5ppp/pn1p4/np2P1P1/3p4/5N2/PPB2PP1/R1BQR1K1 w - - acd 13; acn
921632580;
acs 1801; bm Bxh7+; ce 70; id "ECM.1592"; pv Bxh7+;
[D]r2qrbk1/5ppp/pn1p4/np2P1P1/3p4/5N2/PPB2PP1/R1BQR1K1 w - - acd 14; bm Bxh7+;
ce
272; id "ECM.1592"; pv Bxh7+ Kxh7 g6+ fxg6 Ng5+ Kg8 Qf3 Qf6 Qh3 Qxg5 Bxg5;
[D]r3bb2/P1q3k1/Q2p3p/2pPp1pP/2B1P3/2B5/6P1/R5K1 w - - acd 15; acn 1201537678;
acs
1800; bm Bxe5+; ce 218; id "ECM.1317"; pv Bxe5+ dxe5 d6 Bxd6 Bd5 Bb5 Qa5 Qxa7
Qxa7+ Rxa7 Rxa7+ Kh8 Rb7 Be2 Rd7 Bf8 Rf7 Bd6;
[D]rn3rk1/pp1bppbp/1qp3p1/4P1N1/PP1PB3/2P1B3/4Q1PP/R4RK1 w - - acd 14; acn
796842861; acs 1801; bm Nxh7; ce 237; id "ECM.1617"; pv Qa2 Be8 Rf3 Nd7 a5 Qa6
Raf1 e6 Rh3 h6 Nf3 Kh8 Qf2;
[D]rn3rk1/pp1bppbp/1qp3p1/4P1N1/PP1PB3/2P1B3/4Q1PP/R4RK1 w - - acd 16; bm Nxh7;
ce
482; id "ECM.1617"; pv Nxh7 Kxh7 Rxf7 Rxf7 Qh5+ Kg8 Bxg6 Be6 Qh7+ Kf8 Bh6 Ke8
Qxg7;



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