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Subject: The Szabo WAC corrections analyzed...

Author: Dann Corbit

Date: 09:37:28 04/13/01


1k6/5RP1/1P6/1K6/6r1/8/8/8 w - - acd 12; acn 1377245524; acs 1401; bm Ka5 Kc5
b7; ce 1623; id "WAC.041"; pv Ka5 Rg1 Rf8+ Kb7 g8=Q Ra1+ Kb4 Rb1+ Ka3 Ra1+ Kb2
Rb1+ Kxb1 Kxb6 Qe6+ Kc5 Rc8+ Kb5 Qb3+ Ka6;

1k6/5RP1/1P6/K7/6r1/8/8/8 b - - acd 15; acn 1244072996; acs 1401; bm Ka5 Kc5 b7;
ce -32743; id "WAC.041 after Ka5"; pv Rg1 Rf8+ Kb7 g8=Q Ra1+ Kb4 Rb1+ Ka4 Ra1+
Kb3 Rb1+ Kc2 Rb4 Qd5+ Ka6 Ra8+ Kxb6 Rb8+ Kc7 Rxb4 Kc8 Qf7 Kd8 Rb8#;

1k6/5RP1/1PK5/8/6r1/8/8/8 b - - acd 15; acn 1192917277; acs 1400; bm Ka5 Kc5 b7;
ce -32707; id "WAC.041 after Kc5"; pv Rg6+ Kd7 Kb7 Ke8+ Kxb6 Rf6+ Rxf6;

1k6/1P3RP1/8/1K6/6r1/8/8/8 b - - acd 14; acn 1300970800; acs 1400; bm Ka5 Kc5
b7; ce -1120; id "WAC.041 after b7"; pv Rg5+ Kc6 Rg6+ Kd5 Rg5+ Ke6 Rg6+ Kd7
Kxb7; c0 "There was a fail low, so it seems sure that b7 also results in a win";


r2r2k1/pb3ppp/1p1bp3/7q/3n2nP/PP1B2P1/1B1N1P2/RQ2NRK1 b - - acd 11; acn
30478536; acs 41; bm Bd6xg3 Qxh4; ce 32756; id "WAC.105"; pv Qxh4 Ndf3 Ndxf3+
Nxf3 Bxf3 Bxh7+ Kf8 Bbxg7+ Ke8 gxh4 Bh2#;

r2r2k1/pb3ppp/1p1bp3/8/3n2nq/PP1B2P1/1B1N1P2/RQ2NRK1 w - - acd 14; acn
1052075124; acs 1401; bm Bd6xg3 Qxh4; ce -32757; id "WAC.105 after Qxh4"; pv
Nef3 Ndxf3+ Nxf3 Bxf3 Bxh7+ Kf8 Bbxg7+ Ke8 gxh4 Bh2#;

r2r2k1/pb3ppp/1p2p3/7q/3n2nP/PP1B2b1/1B1N1P2/RQ2NRK1 w - - acd 10; acn
1004669311; acs 1401; bm Bd6xg3 Qxh4; ce -32751; id "WAC.105 after Bxg3"; pv
Bxh7+ Kf8 Ndf3 Qxh4 Be4 Bxf2+ Rxf2 Qxf2+ Kh1 Qf1+ Ng1 Ke7 Bxb7 Rh8+ Qh7 Rxh7#;

He's right.  It clearly wins.

6k1/1b2rp2/1p4p1/3P4/PQ4P1/2N2q2/5P2/3R2K1 b - - acd 15; acn 922832081; acs
1401; bm Bxd5 Rc7 Re6; ce 468; id "WAC.123"; pv Re6 Qc4 g5 Qf1 Bxd5 Nxd5 Qxg4+
Qg2 Qxd1+ Kh2 Rh6+ Kg3 Rh4 Ne3 Qd6+ Kf3 Qc6+ Ke2 Qxg2 Nxg2 Rxa4;

6k1/4rp2/1p4p1/3b4/PQ4P1/2N2q2/5P2/3R2K1 w - - acd 17; acn 1028080894; acs 1400;
bm Bxd5 Rc7 Re6; ce -362; id "WAC.123 after Bxd5"; pv Nxd5 Qxd1+ Kh2 Re2 Nf6+
Kg7 Qf4 Qd2 Qxd2 Rxd2 Ne8+ Kf8 Nc7 Rxf2+ Kg3 Ra2 Nd5 Ra3+ Kh4 Rxa4 Nxb6 Re4;

6k1/1br2p2/1p4p1/3P4/PQ4P1/2N2q2/5P2/3R2K1 w - - acd 16; acn 884174201; acs
1401; bm Bxd5 Rc7 Re6; ce -401; id "WAC.123 after Rc7"; pv Qe4 Qxc3 Qe8+ Kh7 Kg2
Kg7 Qe3 Qxe3 fxe3 Kf6 Kh2 Ke5 d6 Rd7 Kg3 f6 Rd4 Rxd6 Rxd6 Kxd6;

6k1/1b3p2/1p2r1p1/3P4/PQ4P1/2N2q2/5P2/3R2K1 w - - acd 15; acn 991637058; acs
1400; bm Bxd5 Rc7 Re6; ce -492; id "WAC.123 after Re6"; pv Qc4 g5 Qf1 Bxd5 Nxd5
Qxg4+ Qg2 Qxd1+ Kh2 Rh6+ Kg3 Qb3+ Ne3 Qxa4 Kf3 Qc6+ Ke2 Qxg2 Nxg2 Re6+ Kd3 Kg7;

All 3 are winning move choices.

r2b1rk1/pq4p1/4ppQP/3pB1p1/3P4/2R5/PP3PP1/5RK1 w - - acd 15; acn 1065284982; acs
1400; bm Bc7 Rc7; ce 1169; id "WAC.140"; pv Rc7 Qxc7 Bxc7 Rf7 Bxd8 Rxd8 h7+ Kh8
Qxf7 Kxh7 Re1 Rb8 Rxe6 Kh6 g4 g6 b3;

r2b1rk1/pqR3p1/4ppQP/3pB1p1/3P4/8/PP3PP1/5RK1 b - - acd 15; acn 1000217223; acs
1401; bm Bc7 Rc7; ce -1165; id "WAC.140 after Rc7"; pv Qxc7 Bxc7 Rf7 h7+ Kh8
Qxf7 Bxc7 Qxc7 Kxh7 Re1 Re8 Qf7 Rc8 Qxe6 Rb8 Qf5+ Kh6 Re2;

r2b1rk1/pqB3p1/4ppQP/3p2p1/3P4/2R5/PP3PP1/5RK1 b - - acd 15; acn 1034993882; acs
1400; bm Bc7 Rc7; ce -924; id "WAC.140 after Bc7"; pv Rf7 h7+ Kh8 Qxf7 Be7 Re1
Bd6 Rxe6 g4 Rc2 Rf8 Re8 Kxh7 Qh5+ Kg8 Bxd6 Rxe8 Qxe8+ Kh7;

Both moves give a dominant advantage.

r2qr1k1/1b1nbppp/p3pn2/1p1pN3/3P1B2/2PB1N2/PP2QPPP/R4RK1 w - - acd 15; acn
867492450; acs 1401; bm Ng5 Nxf7 a4; ce 201; id "WAC.216"; pv Nxf7 Qb6 N7g5 Bd6
Ne5 Nf8 Ngf7 Bb8 Qf3 Re7 Ng5 Bd6 Rfe1 Bbc6 Nxc6 Qxc6;

r2qr1k1/1b1nbNpp/p3pn2/1p1p4/3P1B2/2PB1N2/PP2QPPP/R4RK1 b - - acd 15; acn
795511238; acs 1401; bm Ng5 Nxf7 a4; ce -206; id "WAC.216 after Nxf7"; pv Qb6
N3e5 Ndxe5 Nxe5 b4 Bg5 bxc3 bxc3 Qc7 Qe3 Ba3 f4 Bab2 Rab1 Qxc3 Kh1;

r2qr1k1/1b1nbppp/p3pn2/1p1pN1N1/3P1B2/2PB4/PP2QPPP/R4RK1 b - - acd 15; acn
763147484; acs 1400; bm Ng5 Nxf7 a4; ce -84; id "WAC.216 after Ng5"; pv Rf8 Rfe1
Qe8 Nxd7 Qxd7 Be5 g6 Qf3 h6 Bxf6 hxg5 Bxe7 Qxe7 a4 Bc6 a5;

r2qr1k1/1b1nbppp/p3pn2/1p1pN3/P2P1B2/2PB1N2/1P2QPPP/R4RK1 b - - acd 15; acn
770625006; acs 1401; bm Ng5 Nxf7 a4; ce -156; id "WAC.216 after a4"; pv Ndxe5
dxe5 Nd7 axb5 axb5 Rxa8 Qxa8 Bxb5 Bc6 Bd3 Nc5 Bc2 Qc8 Ra1 Qc7 Nd4 Bb7;

Both Ng5 and a4 are debatable here, in comparison with Nxf7, and especially Ng5.

r1b2rk1/1p1n1ppp/p1p2q2/4p3/P1B1Pn2/1QN2N2/1P3PPP/3R1RK1 b - - acd 15; acn
810104050; acs 1400; bm Nc5 Nxg2 b5; ce 314; id "WAC.275"; pv Nc5 Qc2 Nxg2 Ne1
Nxe1 Rfxe1 Qg6+ Kh1 Bg4 Be2 Be6 Ra1 Bb3 Qb1 Rad8 a5;

r1b2rk1/1p1n1ppp/p1p2q2/4p3/P1B1P3/1QN2N2/1P3PnP/3R1RK1 w - - acd 15; acn
824695782; acs 1401; bm Nc5 Nxg2 b5; ce -268; id "WAC.275 after Nxg2"; pv Nce2
Nf4 Qe3 b5 Bd3 Qg6+ Ng3 Qg4 Kh1 Bb7 Rg1 Nh3 Rge1 Rad8 b3;

r1b2rk1/3n1ppp/p1p2q2/1p2p3/P1B1Pn2/1QN2N2/1P3PPP/3R1RK1 w - - acd 15; acn
799961557; acs 1400; bm Nc5 Nxg2 b5; ce -257; id "WAC.275 after b5"; pv Be2 Qg6
g3 Nxe2+ Ncxe2 Qxe4 Qe3 Qxa4 Rd6 Qb4 Rfd1 e4 Ng5 Nf6 Rxc6 h6 Rxf6 gxf6 Qxe4 Qxe4
Nxe4;

r1b2rk1/1p3ppp/p1p2q2/2n1p3/P1B1Pn2/1QN2N2/1P3PPP/3R1RK1 w - - acd 14; acn
814869804; acs 1401; bm Nc5 Nxg2 b5; ce -321; id "WAC.275 after Nc5"; pv Qc2
Nxg2 Ne1 Nxe1 Rfxe1 Qg6+ Kh1 Bg4 Be2 Be6 Rd6 Bb3 Rxg6 Bxc2 Rd6 Nxe4;

It seems that Nc5 may be slightly better, but both b5 and Nxg2 give a very good
advantage.

r7/4b3/2p1r1k1/1p1pPp1q/1P1P1P1p/PR2NRpP/2Q3K1/8 w - - acd 16; acn 873122307;
acs 1400; bm Nxf5 Rc3; ce 465; id "WAC.279"; pv Nxf5 Kf7 Nxe7 Rxe7 Qxc6 Rd8 f5
Kg8 Qxb5 Rc7 Qe2 Qh6 Rbc3 Re7 f6 Rf7;

r7/4b3/2p1r1k1/1p1pPN1q/1P1P1P1p/PR3RpP/2Q3K1/8 b - - acd 16; acn 828963340; acs
1401; bm Nxf5 Rc3; ce -514; id "WAC.279 after Nxf5"; pv Kf7 Nxe7 Rxe7 Qxc6 Rd8
f5 Qg5 Rb2 Kg8 Qxb5 Qc1 Qe2 Qc4 f6 Rf7 Qe3;

r7/4b3/2p1r1k1/1p1pPp1q/1P1P1P1p/P1R1NRpP/2Q3K1/8 b - - acd 17; acn 796646209;
acs 1400; bm Nxf5 Rc3; ce -343; id "WAC.279 after Rc3"; pv Kf7 Nxf5 Qg6 Ne3
Qxc2+ Rxc2 Bd8 f5 Re8 e6+ Kf8 Rxc6 Rxa3 Nxd5 Ra2+ Kg1 Rd2 f6 Rd1+ Kg2 Rd2+ Kf1
Rxd4;

It seems that Rc3 is not as good, but three and a half pawns is a rather telling
advantage.  Rc3 probably wins also.

3r4/1p2k2p/p1b1p1p1/4Q1Pn/2B3KP/4pP2/PP2R1N1/6q1 b - - acd 13; acn 973716442;
acs 1400; bm Rd4+ Rf8; ce 829; id "WAC.296 (original)"; pv Rd4+ f4 Qh2 Qxe3 Re4
Qf2 Rxc4 Qe3 Nxf4 Qxf4 Rxf4+ Nxf4 Qg1+ Kh3 Qh1+ Kg3 Qf3+ Kh2 Qxf4+ Kh3;

8/1p2k2p/p1b1p1p1/4Q1Pn/2Br2KP/4pP2/PP2R1N1/6q1 w - - acd 12; acn 1099441417;
acs 1401; bm Rd4+ Rf8; ce -689; id "WAC.296 (original) after Rd4+"; pv f4 Rxf4+
Qxf4 Nxf4 Kxf4 Bxg2 Bxe6 Bf1 Rxe3 Qf2+ Rf3 Qd4+ Kg3 Qe5+ Kf2 Qe2+ Kg3 Kxe6;

5r2/1p2k2p/p1b1p1p1/4Q1Pn/2B3KP/4pP2/PP2R1N1/6q1 w - - acd 14; acn 1003286303;
acs 1400; bm Rd4+ Rf8; ce -751; id "WAC.296 (original) after Rf8"; pv Qc5+ Ke8
Qxe3 Bd7 f4 e5+ Kf3 Bc6+ Kg4 Rxf4+ Qxf4 Nxf4 Rxe5+ Kd8 Re3 Nxg2 Rc3 Qd4+ Kg3
Nxh4;

Both Rd4+ and Rf8 win in the original (possibly errant) problem as proposed.

3r4/1p3k1p/p1b1p1p1/4Q1Pn/2B3KP/4pP2/PP2R1N1/6q1 b - - acd 14; acn 848684155;
acs 1401; bm Bd7; ce 0; id "WAC.296b"; pv Bxf3+ Kxf3 Qf1+ Ke4 Qb1+ Kf3 Qf1+;

I doubt that Bd7 is a solution to this problem.



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