Ed's difficult checkmate with zugzwangs in it

Discussion of anything and everything relating to chess playing software and machines.

Moderators: hgm, Rebel, chrisw

Dann Corbit
Posts: 12540
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Ed's difficult checkmate with zugzwangs in it

Post by Dann Corbit »

I made the mistake of analyzing forwards and backwards the solution from YACPDB, which has wrong moves in it. That loaded the hash table with the bad scores, which returned instantly with the wrong distances.

Examining all the positions in the thread, and analyzing those forwards and backwards gives this (original problem is the last node):

Code: Select all

Q1K1k1br/5n1r/5pN1/2p2N2/7P/2P5/3p4/8 w - - acd 3; acs 0; bm Qa4# Qc6#; c3 "Qa4#"; ce 32766; dm 1; pm Qa4# Qc6#; pv Qc6#; 
Q1K1k1br/5n1r/5pN1/2p2N2/7P/2Pp4/8/8 b - - acd 88; acs 177; bm d2 c4 Nh6 Ng5 Ne5 Nd6+ Rxh4 Rh6 Rh5 Nd8; c3 "d2"; ce -32765; dm -1; pm d2 c4 Nh6 Ng5 Ne5 Nd6+ Rxh4 Rh6 Rh5 Nd8; pv Nd6+ Nxd6+; 
2K1k1br/P4n1r/5pN1/2p2N2/7P/2Pp4/8/8 w - - acd 5; acs 0; bm a8=B a8=N a8=Q; c3 "a8=Q"; ce 32764; dm 2; pm a8=B a8=N a8=Q; pv a8=Q Nd6+ Nxd6#; 
2K1k1br/P4n1r/5pN1/2p2N2/3p3P/2P5/8/8 b - - acd 84; acs 176; bm dxc3 d3 c4; c3 "d3"; ce -32763; dm -2; pm dxc3 d3 c4; pv c4 a8Q dxc3 Qa4+; 
2K1k1br/5n1r/P4pN1/2p2N2/3p3P/2P5/8/8 w - - acd 7; acs 0; bm a7; c3 "a7"; ce 32762; dm 3; pm a7; pv a7 d3 a8=Q Nd6+ Nxd6#; 
2K1k1br/5n1r/P4pN1/2pp1N2/7P/2P5/8/8 b - - acd 7; acs 10; bm d4; c3 "d4"; ce -32761; dm -3; pm d4; pv d4 a7 dxc3 a8=Q Rxh4 Ng7#; 
2K1k1br/5n1r/5pN1/P1pp1N2/7P/2P5/8/8 w - - acd 9; acs 0; bm a6; c3 "a6"; ce 32760; dm 4; pm a6; pv a6 d4 a7 d3 a8=Q Nd6+ Nxd6#; 
2K1k1br/5n1r/2p2pN1/P2p1N2/7P/2P5/8/8 b - - acd 9; acs 10; bm c5; c3 "c5"; ce -32759; dm -4; pm c5; pv c5 a6 d4 a7 dxc3 a8=Q Rxh4 Ng7#; 
2K1k1br/5n1r/2p2pN1/3p1N2/P6P/2P5/8/8 w - - acd 11; acs 0; bm a5; c3 "a5"; ce 32758; dm 5; pm a5; pv a5 c5 a6 d4 a7 d3 a8=Q Nd6+ Nxd6#; 
2K1k1br/5n1r/2pp1pN1/5N2/P6P/2P5/8/8 b - - acd 11; acs 10; bm d5; c3 "d5"; ce -32757; dm -5; pm d5; pv d5 a5 c5 a6 d4 a7 dxc3 a8=Q Rxh4 Ng7#; 
2K1k1br/5n1r/2pp1pN1/5N2/P6P/2p5/3P4/8 w - - acd 13; acs 0; bm dxc3; c3 "dxc3"; ce 32756; dm 6; pm dxc3; pv dxc3 d5 a5 c5 a6 d4 a7 d3 a8=Q Nd6+ Nxd6#; 
2K1k1br/5n1r/2pp1pN1/5N2/P1p4P/8/3P4/8 b - - acd 13; acs 10; bm c3; c3 "c3"; ce -32755; dm -6; pm c3; pv c3 dxc3 d5 a5 c5 a6 d4 a7 dxc3 a8=Q Rxh4 Ng7#; 
2K1k1br/5n1r/2pp1pN1/5N2/2p4P/8/P2P4/8 w - - acd 15; acs 1; bm a4; c3 "a4"; ce 32754; dm 7; pm a4; pv a4 c3 dxc3 d5 a5 c5 a6 d4 a7 dxc3 a8=Q Rxh4 Ng7#; 
2K1k1br/5n1r/2pp1pN1/3p1N2/2P4P/8/P2P4/8 b - - acd 15; acs 11; bm dxc4; c3 "dxc4"; ce -32753; dm -7; pm dxc4; pv dxc4 a4 c3 dxc3 d5 a5 c5 a6 d4 a7 dxc3 a8=Q Rxh4 Ng7#; 
4k1br/2K2n1r/2pp1pN1/3p1N2/2P4P/8/P2P4/8 w - - acd 17; acs 2; bm Kc8; c3 "Kc8"; ce 32752; dm 8; pm Kc8; pv Kc8 dxc4 a4 c3 dxc3 d5 a5 c5 a6 d4 a7 d3 a8=Q Nd6+ Nxd6#; 
4k1br/2Kp1n1r/2p2pN1/3p1N2/2P4P/8/P2P4/8 b - - acd 79; acs 164; bm dxc4 d6; c3 "d6"; ce -32751; dm -8; pm dxc4 d6; pv dxc4 Kc8 c5 a4 c3 dxc3 d6 a5 c4 a6 d5 a7 d4 a8Q dxc3 Qa4+; 
2K1k1br/2qp1n1r/2p2pN1/3p1N2/2P4P/8/P2P4/8 w - - acd 19; acs 1; bm Kxc7; c3 "Kxc7"; ce 32750; dm 9; pm Kxc7; pv Kxc7 dxc4 Kc8 c5 a4 c3 dxc3 d5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6#; 
2K1k1br/2Np1n1r/2p2pN1/3p1N2/2P2q1P/8/P2P4/8 b - - acd 19; acs 1; bm Qxc7+; c3 "Qxc7+"; ce -32749; dm -9; pm Qxc7+; pv Qxc7+ Kxc7 dxc4 Kc8 c5 a4 c3 dxc3 d5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6#; 
N1K1k1br/3p1n1r/2p2pN1/3p1N2/2P2q1P/8/P2P4/8 w - - acd 21; acs 0; bm Nc7+; c2 "#10; 01:04; 00:00 @ C0/R0/K1/P5/X27;"; c3 "Nc7+"; ce 32748; dm 10; id "ChestDB.6074"; pm Nc7+; pv Nc7+ Qxc7+ Kxc7 dxc4 a4 c3 dxc3 d6 Kc8 d5 a5 c5 a6 d4 a7 d3 a8=Q Nd6+ Nxd6#; 
N1K1k1br/3p1n1r/2p2pN1/3p1N2/2P4P/8/P2P4/5q2 b - - acd 21; acs 60; bm Qf4; c3 "Qf4"; ce -32747; dm -10; pm Qf4; pv Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
2K1k1br/P2p1n1r/2p2pN1/3p1N2/2P4P/8/P2P4/5q2 w - - acd 23; acs 60; bm a8=N; c3 "a8=N"; ce 32746; dm 11; pm a8=N; pv a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
2K1k1br/P2p1n1r/2p2pN1/3p1N2/2P4P/8/P2P1p2/8 b - - acd 23; acs 60; bm f1=Q; c3 "f1=Q"; ce -32745; dm -11; pm f1=Q; pv f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
2K1k1br/3p1n1r/P1p2pN1/3p1N2/2P4P/8/P2P1p2/8 w - - acd 25; acs 2; bm a7; c2 "#12; 00:00 @ C0/R0/K1/P6/X29;"; c3 "a7"; ce 32744; dm 12; id "ChestDB.6703"; pm a7; pv a7 f1Q a8N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 a4 c3 dxc3 d6 Kc8 d5 a5 c5 a6 d4 a7 d3 a8Q Nd6+ Nxd6+; 
2K1k1br/3p1n1r/P1p2pN1/3p1N2/2P4P/5p2/P2P4/8 b - - acd 25; acs 60; bm f2; c3 "f2"; ce -32743; dm -12; pm f2; pv f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
2K1k1br/3p1n1r/2p2pN1/P2p1N2/2P4P/5p2/P2P4/8 w - - acd 27; acs 60; bm a6; c3 "a6"; ce 32742; dm 13; pm a6; pv a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
2K1k1br/3p1n1r/2p2pN1/P2p1N2/2P3pP/5B2/P2P4/8 b - - acd 27; acs 60; bm gxf3; c3 "gxf3"; ce -32741; dm -13; pm gxf3; pv gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
4k1br/1K1p1n1r/2p2pN1/P2p1N2/2P3pP/5B2/P2P4/8 w - - acd 29; acs 60; bm Kc8; c3 "Kc8"; c5 "ERET.103 - Zugzwang"; ce 32740; dm 14; id "ERET 103 - Zugzwang"; pm Kc8; pv Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
5kbr/1K1p1n1r/2p2pN1/P2p1N2/2P3pP/5B2/P2P4/8 b - - acd 29; acs 60; bm Ke8; c3 "Ke8"; ce -32739; dm -14; pm Ke8; pv Ke8 Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
5kbr/1K1p1n1r/2p2p2/P2p1N2/2P2NpP/5B2/P2P4/8 w - - acd 31; acs 60; bm Ng6+; c3 "Ng6+"; ce 32738; dm 15; pm Ng6+; pv Ng6+ Ke8 Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
6br/1K1p1nkr/2p2p2/P2p1N2/2P2NpP/5B2/P2P4/8 b - - acd 31; acs 60; bm Kf8; c3 "Kf8"; ce -32737; dm -15; pm Kf8; pv Kf8 Ng6+ Ke8 Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
6br/1K1p1nkr/2p2p2/P2p4/2PN1NpP/5B2/P2P4/8 w - - acd 33; acs 60; bm Nf5+; c3 "Nf5+"; ce 32736; dm 16; pm Nf5+; pv Nf5+ Kf8 Ng6+ Ke8 Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
6br/1K1p1n1r/2p2pk1/P2p4/2PN1NpP/5B2/P2P4/8 b - - acd 33; acs 60; bm Kg7; c3 "Kg7"; ce -32735; dm -16; pm Kg7; pv Kg7 Nf5+ Kf8 Ng6+ Ke8 Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
6br/1K1p1n1r/2p2pk1/P2p4/2PN2pP/3N1B2/P2P4/8 w - - acd 35; acs 60; bm Nf4+; c3 "Nf4+"; ce 32734; dm 17; pm Nf4+; pv Nf4+ Kg7 Nf5+ Kf8 Ng6+ Ke8 Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
6br/1K1p1n1r/2p2p2/P2p1k2/2PN2pP/3N1B2/P2P4/8 b - - acd 35; acs 60; bm Kg6; c3 "Kg6"; ce -32733; dm -17; pm Kg6; pv Kg6 Nf4+ Kg7 Nf5+ Kf8 Ng6+ Ke8 Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
6br/1K1p1n1r/2p2p2/PN1p1k2/2P3pP/3N1B2/P2P4/8 w - - acd 37; acs 60; bm Nd4+; c3 "Nd4+"; ce 32732; dm 18; pm Nd4+; pv Nd4+ Kg6 Nf4+ Kg7 Nf5+ Kf8 Ng6+ Ke8 Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
6br/1K1p1n1r/2p2p2/PN1pkP2/2P3pP/3N1B2/P2P4/8 b - - acd 37; acs 60; bm Kxf5; c3 "Kxf5"; ce -32731; dm -18; pm Kxf5; pv Kxf5 Nd4+ Kg6 Nf4+ Kg7 Nf5+ Kf8 Ng6+ Ke8 Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
6br/1K1p1n1r/2p2p2/PN1pkP2/2P3pP/5B2/PN1P4/8 w - - acd 39; acs 60; bm Nd3+; c3 "Nd3+"; ce 32730; dm 19; pm Nd3+; pv Nd3+ Kxf5 Nd4+ Kg6 Nf4+ Kg7 Nf5+ Kf8 Ng6+ Ke8 Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
6br/1K1p1n1r/2p2p2/PN1pRP2/2Pk2pP/5B2/PN1P4/8 b - - acd 39; acs 60; bm Kxe5; c3 "Kxe5"; ce -32729; dm -19; pm Kxe5; pv Kxe5 Nd3+ Kxf5 Nd4+ Kg6 Nf4+ Kg7 Nf5+ Kf8 Ng6+ Ke8 Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
6br/1KNp1n1r/2p2p2/P2pRP2/2Pk2pP/5B2/PN1P4/8 w - - acd 41; acs 60; bm Nb5+; c3 "Nb5+"; ce 32728; dm 20; pm Nb5+; pv Nb5+ Kxe5 Nd3+ Kxf5 Nd4+ Kg6 Nf4+ Kg7 Nf5+ Kf8 Ng6+ Ke8 Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
6br/1KNp1n1r/2p2p2/P1kpRP2/2PP2pP/5B2/PN1P4/8 b - - acd 41; acs 60; bm Kxd4; c3 "Kxd4"; ce -32727; dm -20; pm Kxd4; pv Kxd4 Nb5+ Kxe5 Nd3+ Kxf5 Nd4+ Kg6 Nf4+ Kg7 Nf5+ Kf8 Ng6+ Ke8 Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
6br/1KNp1n1r/2p2p2/P1kpRP2/2P3pP/3P1B2/PN1P4/8 w - - acd 43; acs 60; bm d4+; c3 "d4+"; ce 32726; dm 21; pm d4+; pv d4+ Kxd4 Nb5+ Kxe5 Nd3+ Kxf5 Nd4+ Kg6 Nf4+ Kg7 Nf5+ Kf8 Ng6+ Ke8 Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
6br/1KNp1n1r/2p2p2/P1BpRP2/1kP3pP/3P1B2/PN1P4/8 b - - acd 43; acs 60; bm Kxc5; c3 "Kxc5"; ce -32725; dm -21; pm Kxc5; pv Kxc5 d4+ Kxd4 Nb5+ Kxe5 Nd3+ Kxf5 Nd4+ Kg6 Nf4+ Kg7 Nf5+ Kf8 Ng6+ Ke8 Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
6br/1KNp1n1r/2p2p2/P1ppRP2/1kP3pP/3PBB2/PN1P4/8 w - - acd 45; acs 60; bm Bxc5+; c0 "Der brillante Schachzug 065 - Matt in 22, Van Essen 2005"; c2 "#22;"; c3 "Bxc5+"; ce 32724; dm 22; id "W.Eigenmann: Brillant 065"; pm Bxc5+; pv Bxc5+ Kxc5 d4+ Kxd4 Nb5+ Kxe5 Nd3+ Kxf5 Nd4+ Kg6 Nf4+ Kg7 Nf5+ Kf8 Ng6+ Ke8 Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+;
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.
Top
Dann Corbit
Posts: 12540
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: Ed's difficult checkmate with zugzwangs in it

Post by Dann Corbit »

Here is the proposed solution from YACPDB, which has errors:

>>275467
Van Essen, Martin
Humor Tourney EBUR 2004
2nd Prize
+ 13+11
Solution:
1. Bxc5+ (1. Re8 $2 Nd6+ 2. Kb6 d4 3. Rb8 dxe3 4. a6
Bxc4 $1 5. a3+ Kxa3 6. a7 gxf3 7. Nxc4+ Nxc4+ 8. dxc4
Rxb8+ 9. axb8=Q f2 10. Nb5+ cxb5 11. Qf4 exd2 12. Qe3+
Ka4 $1 13. Qd3 Rxh4) 1... Kxc5 (1... Kxa5 2. a3 $1)
2. d4+ Kxd4 (2... Kb4 3. Re3 $1 dxc4 4. a3+ Kxa5 5.
Nxc4+ Ka4 6. Bd1#) (2... Kd6 3. c5#) 3. Nb5+ $1 Kxe5
(3... cxb5 4. Rxd5#) (3... Kc5 4. d4+ Kb4 5. Re3 $1
dxc4 (5... cxb5 6. Rb3+ Kxa5 7. Rxb5#) (5... Rxh4 6.
Rb3+ Kxa5 7. Ra3+ Kb4 8. Ra4#) 6. Kb6 $1 cxb5 7. a3#)
4. Nd3+ Kxf5 5. Nd4+ Kg6 6. Nf4+ Kg7 7. Nf5+ Kf8 8.
Ng6+ Ke8 9. Kc8 $1 (9. a6 $2 Ne5 10. Nd6+ Kd8 11. a7
Nxg6 12. a8=Q+ Ke7 13. Nf5+ Kf7 14. Bxg4 Nxh4 ) 9...
gxf3 10. a6 f2 11. a7 f1=Q 12. a8=N $1 (12. a8=Q $2
Qxf5 13. Kc7+ Nd8) 12... Qf4 $1 13. Nc7+ $1 Qxc7+ 14.
Kxc7 dxc4 15. a4 d5 16. Kc8 $1 d4 17. a5 c3 18. a6 cxd2
(18... c2 19. a7 c1=Q 20. a8=N $1) 19. a7 d1=Q 20. a8=N
$1 Ne5 21. Nd6# 1-0
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.
Top

Return to “Computer Chess Club: General Topics”