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Subject: Snatching victory from the mouth of defeat. Does your program see?

Author: Dann Corbit

Date: 13:05:30 05/13/99

Here are some [not terribly difficult] won positions:
1rq5/p3kp2/2Bp1p2/1P2p1r1/QP3n2/2P5/5PPP/R4RK1 b - -
1rr3k1/4ppb1/2q1bnp1/1p2B1Q1/6P1/2p2P2/2P1B2R/2K4R w - -
2n4k/r6p/4BK2/p7/8/4p2n/1B6/8 w - -
3b4/p3P1q1/P1n2pr1/4p3/2B1n1Pk/1P1R4/P1p3KN/1N6 w - -
3b4/pK1Rp3/1p5p/k2p4/8/PP6/6p1/8 w - -
3n4/8/n6p/2p2K1k/1b6/2p3P1/2B1p3/8 w - -
3q1rk1/4bp1p/1n2P2Q/3p1p2/6r1/Pp2R2N/1B4PP/7K w - -
3r2r1/1k1b3n/1pp2q1b/3P1Np1/R4pp1/1Q3R1P/1PP5/2B4K w - -
5r1k/1p1b1p1p/p2ppb2/5P1B/1q6/1Pr3R1/2PQ2PP/5R1K w - -
r3k3/ppp2N2/3p1n2/2b1p3/2BnP1b1/2NP2p1/PPPQ1PPr/R4RK1 b q -
r5k1/7p/2pP2pP/1p6/1q3B2/1p2Q1P1/1P6/rNK1R2R b - -
Can your program find the mates?
{spoiler below}














































3n4/8/n6p/2p2K1k/1b6/2p3P1/2B1p3/8 w - - ; pv Be4 e1=N Bd5 c2 Bc4 c1=N Bb5 Nc6
Bxc6 Nc7 Ba4 Ne2 Bd1 Nf3 Bxe2 Nb5 Bxf3#;

3b4/p3P1q1/P1n2pr1/4p3/2B1n1Pk/1P1R4/P1p3KN/1N6 w - - ; pv Rh3+ Kg5 Rh5+ Kf4
Rf5+ Ke3 Rf3+ Kd4 Rd3+ Kc5 Rd5+ Kb6 Rb5+ Kc7 Rb7+ Kd6 e8=N+ Kc5 Rb5+ Kd4 Rd5+
Ke3 Rd3+ Kf4 Rf3+ Kg5 Rf5+ Kh4 Rh5#;

3r2r1/1k1b3n/1pp2q1b/3P1Np1/R4pp1/1Q3R1P/1PP5/2B4K w - - ; pv Qxb6+ Kxb6 Rb3+
Kc5 Ra5+ Kc4 Rb4+ Kxb4 Bd2+ Qc3 Bxc3+ Kc4 Nd6#;

3r2r1/1k1b3n/1pp2q1b/3P1Np1/R4pp1/1Q3R1P/1PP5/2B4K w - - ; pv Qxb6+ Kxb6 Rb3+
Kc5 Ra5+ Kc4 Rb4+ Kxb4 Bd2+ Qc3 Bxc3+ Kc4 Nd6#;

2n4k/r6p/4BK2/p7/8/4p2n/1B6/8 w - - ; pv Bf7 Rb7 Bc3 Rc7 Bd4 Rd7 Be5 Re7 Ba1 Rc7
Ke6+ Rc3 Bxc3#;

r5k1/7p/2pP2pP/1p6/1q3B2/1p2Q1P1/1P6/rNK1R2R b - - ; pv Rxb1+ Kxb1 Ra1+ Kxa1
Qa4+ Kb1 Qa2+ Kc1 Qa1+ Kd2 Qxb2+ Kd3 Qc2+ Kd4 Qc4+ Ke5 Qd5+ Kf6 Qf7+ Ke5 Qf5+
Kd4 c5+ Kc3 Qc2#;

3q1rk1/4bp1p/1n2P2Q/3p1p2/6r1/Pp2R2N/1B4PP/7K w - - ; pv Ng5 Rxg5 Rh3 Re8 Qxh7+
Kf8 Qxf7#;

3b4/pK1Rp3/1p5p/k2p4/8/PP6/6p1/8 w - - ; pv Kc6 Ka6 b4 b5 a4 bxa4 Rxd5 g1=Q Ra5+
Bxa5 b5#;

r3k3/ppp2N2/3p1n2/2b1p3/2BnP1b1/2NP2p1/PPPQ1PPr/R4RK1 b q - ; pv Nf3+ gxf3 Bxf3
Bb5+ Kxf7 Bc4+ Kf8 Qh6+ Rxh6 a3 Rh1#;

1rr3k1/4ppb1/2q1bnp1/1p2B1Q1/6P1/2p2P2/2P1B2R/2K4R w - - ; pv Qh6 Bxh6+ Rxh6 g5
Rh8+ Kg7 R1h7+ Kg6 Bd3+ Qe4 Bxe4+ Nxe4 Rg7#;

5r1k/1p1b1p1p/p2ppb2/5P1B/1q6/1Pr3R1/2PQ2PP/5R1K w - - ; pv Qh6 Rxg3 Bg6 Rxg6
fxg6 fxg6 Qxf8#;

1rq5/p3kp2/2Bp1p2/1P2p1r1/QP3n2/2P5/5PPP/R4RK1 b - - ; pv Qh3 Qxa7+ Kf8 Qxb8+
Kg7 Qh8+ Kxh8 Rfd1 Rxg2+ Kf1 Rg3+ Ke1 Rg1+ Kd2 Qd3+ Kc1 Qxc3+ Kb1 Rxd1+ Ka2
Rxa1#;

Re: Snatching victory from the mouth of defeat. Does your program see? Hans Havermann 18:37:26 05/18/99
Re: Snatching victory from the mouth of defeat. Does your program see? Francis Monkman 07:06:57 05/14/99
Re: Snatching victory from the mouth of defeat. Does your program see? Francis Monkman 07:02:30 05/14/99
Re: Snatching victory from the mouth of defeat. Does your program see? Paulo Soares 01:51:20 05/14/99
- Re: Snatching victory from the mouth of defeat. Does your program see? Dann Corbit 11:53:25 05/14/99
  - Re: Snatching victory from the mouth of defeat. Does your program see? Paulo Soares 23:03:24 05/14/99
Re: Snatching victory from the mouth of defeat. Does your program see? James Swafford 20:56:41 05/13/99
Re: Snatching victory from the mouth of defeat. Does your program see? William Bryant 16:39:22 05/13/99
- Re: Snatching victory from the mouth of defeat. Does your program see? Dann Corbit 17:44:34 05/13/99
  - Re: Snatching victory from the mouth of defeat. Does your program see? William Bryant 20:56:17 05/13/99

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