Author: Mike Byrne
Date: 22:50:46 08/26/03
contains a position that has been tested for years - first the game: [Event "New York"] [Site "?"] [Date "1947.??.??"] [Round "?"] [White "Evans, L."] [Black "Pilnick, C."] [Result "1-0"] [ECO "C13"] [PlyCount "57"] [EventDate "1947.??.??"] 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. Bxf6 Bxf6 6. e5 Be7 7. Qg4 O-O 8. O-O-O c5 9. h4 cxd4 10. Nce2 Nc6 11. f4 Qa5 12. Kb1 d3 13. cxd3 Bd7 14. Rh3 Rac8 15. Rg3 g6 16. d4 b5 17. h5 Nb4 18. a3 Nc6 19. hxg6 fxg6 20. Nc3 b4 21. Bd3 Be8 22. Nf3 bxa3 23. Qxe6+ Bf7 24. Bxg6 axb2 25. Bxh7+ Kh8 26. Qh6 Qa1+ 27. Kc2 b1=Q+ 28. Rxb1 Nb4+ 29. Kd1 1-0 Larry Evans took about 30 minutes to make 24.Bxg6 in 1947. In 1993, the TASC R30 reportedly solved this in 19 hours. Cray Blitz was reportedly able to solve this in 1.9 seconds (Source CCR 1995). Rebel on a P75 took almost 20 minutes and still showed a negative score. HIARCS on a P90 took 1 hour and 5 minutes. HIARCS today shows a positive score in <1 minute on my machine. Evans,L - Pilnick,C [d]2r2rk1/p3bb1p/2n1Q1p1/q2pP3/3P1P2/p1NB1NR1/1P4P1/1K1R4 w - - 0 1 ;bm Bxg6! Analysis by Crafty 19.04 SE <Fischer>: 24.Qf5 axb2 25.e6 Be8 26.Qh5 Qxc3 27.Qxd5 Rxf4 -+ (-6.48) Depth: 5 00:00:00 24.Qh3 axb2 25.Rh1 Qa1+ 26.Kc2 Nxd4+ 27.Nxd4 -+ (-6.21) Depth: 5 00:00:00 24.Qg4 axb2 -+ (-5.88) Depth: 5 00:00:00 24.Qg4 axb2 -+ (-5.88) Depth: 5 00:00:00 24.Qg4 axb2 -+ (-5.88) Depth: 6 00:00:00 109kN 24.Qg4 axb2 -+ (-5.88) Depth: 6 00:00:00 245kN 24.Qg4 axb2 -+ (-5.88) Depth: 7 00:00:00 245kN 24.Qg4 axb2 -+ (-5.88) Depth: 7 00:00:00 591kN 24.Qg4 axb2 25.e6 Be8 26.Kxb2 Qa3+ 27.Kb1 Qb3+ 28.Kc1 Qxc3+ 29.Kb1 Rb8+ 30.Ka2 Nxd4 31.Nxd4 Qxd4 -+ (-6.09) Depth: 8 00:00:01 1437kN 24.Qg4 axb2 25.e6 Be8 26.Kxb2 Qa3+ 27.Kb1 Qb3+ 28.Kc1 Qxc3+ 29.Kb1 Rb8+ 30.Ka2 Nxd4 31.Nxd4 Qxd4 -+ (-6.09) Depth: 8 00:00:02 2531kN 24.Qg4 axb2 25.e6 Be8 26.f5 Qa1+ 27.Kc2 Nb4+ 28.Kd2 Rxc3 29.Bb1 Ba4 30.fxg6 -+ (-7.63) Depth: 9 00:00:10 9376kN 24.Rxg6+ hxg6 25.Qg4 axb2 26.Bxg6 Qa1+ 27.Kc2 Nxd4+ 28.Kd2 Nb3+ 29.Ke1 Rxc3 30.Bxf7+ Kxf7 31.e6+ Ke8 32.Qh5+ Kd8 33.Qxd5+ -+ (-6.79) Depth: 9 00:00:27 25332kN 24.Bf5 Bxe6 25.Bxe6+ Kh8 26.Bxc8 Rxc8 27.Nh4 Bxh4 28.Re3 axb2 29.Kxb2 Kg7 -+ (-6.54) Depth: 9 00:00:33 30771kN 24.Bxg6 -+ (-5.69) Depth: 9 00:00:37 34427kN 24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Rh1 Rxf4 27.Bf5+ Bh4 28.Rxh4+ Rxh4 29.Nxh4 a2+ 30.Nxa2 Qe1+ 31.Nc1 Nxd4 -+ (-5.54) Depth: 9 00:00:38 35400kN 24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Rh1 Rxf4 27.Bf5+ Bh4 28.Rxh4+ Rxh4 29.Nxh4 a2+ 30.Nxa2 Qe1+ 31.Nc1 Nxd4 -+ (-5.54) Depth: 9 00:00:38 35640kN 24.Bxg6 -+ (-5.14) Depth: 10 00:00:41 39157kN 24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Rh1 Bh4 27.Nxh4 a2+ 28.Nxa2 Nxe5 29.Bf5 Rxf5 30.Nxf5# -+ (-3.24) Depth: 10 00:00:49 46705kN 24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Rh1 Bh4 27.Nxh4 a2+ 28.Nxa2 Nxe5 29.Bf5 Rxf5 30.Nxf5# -+ (-3.24) Depth: 10 00:00:55 52682kN 24.Bxg6 -+ (-2.84) Depth: 11 00:01:14 72896kN 24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Rh1 Bh4 27.Nxh4 Rf7 28.Ng6+ Kg7 29.Ne7+ Kf8 30.Nxc8 Rc7 31.Nd6 axb2 32.Kxb2 Nxd4 µ (-0.83) Depth: 11 00:01:45 105309kN 24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Rh1 Bh4 27.Nxh4 Rf7 28.Ng6+ Kg7 29.Ne7+ Kf8 30.Nxc8 Rc7 31.Nd6 axb2 32.Kxb2 Nxd4 µ (-0.83) Depth: 11 00:01:48 109109kN 24.Bxg6 ³ (-0.43) Depth: 12 00:04:26 259110kN 24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Rh1 Bh4 27.Bd3 Bh3 28.Nxh4 Rg8 29.Rgxh3 Kg7 30.Nf5+ Kf8 31.Rh8 axb2 32.Rxg8+ Kxg8 33.Kxb2 ± (0.79) Depth: 12 00:08:37 481284kN (Byrne, Secane, PA USA 27.08.2003) Evans,L - Pilnick,C 2r2rk1/p3bb1p/2n1Q1p1/q2pP3/3P1P2/p1NB1NR1/1P4P1/1K1R4 w - - 0 1 Analysis by Rebel 12: 24.bxa3 Qb6+ 25.Nb5 Bxe6 -+ (-8.59) Depth: 1 00:00:00 24.Qh3 ± (0.76) Depth: 1 00:00:00 24.Qh3 ± (0.76) Depth: 1 00:00:00 24.Qh3 ± (0.76) Depth: 1 00:00:00 24.Qh3 ± (0.76) Depth: 1 00:00:00 24.Qh3 ± (0.76) Depth: 1 00:00:00 24.Qh3 axb2 25.Na2 µ (-1.37) Depth: 2 00:00:00 24.Qh3 axb2 25.Na2 Nb4 -+ (-2.30) Depth: 3 00:00:00 24.Qd7 axb2 25.Na2 Qa4 -+ (-2.15) Depth: 3 00:00:00 24.Qd7 axb2 25.e6 Qa1+ 26.Kc2 Nb4+ -+ (-2.98) Depth: 4 00:00:00 24.Qd7 axb2 25.e6 Qa1+ 26.Kc2 Nb4+ 27.Kd2 -+ (-2.98) Depth: 5 00:00:00 24.Qd7 axb2 25.Bf5 Rc7 26.Qxc7 Qxc7 27.Kxb2 Rb8+ -+ (-4.74) Depth: 6 00:00:01 371kN 24.Qh3 axb2 25.Rh1 Qa1+ 26.Kc2 Nxd4+ 27.Kd2 Nxf3+ -+ (-3.59) Depth: 6 00:00:01 558kN 24.Qh3 axb2 25.Rh1 Qa1+ 26.Kc2 Nxd4+ 27.Nxd4 -+ (-4.12) Depth: 7 00:00:02 1022kN 24.Qh3 axb2 25.e6 Qa1+ 26.Kc2 Nxd4+ 27.Nxd4 Rxc3+ -+ (-4.45) Depth: 8 00:00:05 2272kN 24.Qd7 axb2 25.e6 Qa1+ 26.Kc2 Nxd4+ 27.Kd2 Nxe6 -+ (-4.05) Depth: 8 00:00:06 3195kN 24.Qd7 axb2 25.e6 Qa1+ 26.Kc2 Nxd4+ 27.Kd2 Rxc3 -+ (-5.85) Depth: 9 00:00:26 13105kN 24.Qh3 axb2 25.e6 Qa1+ 26.Kc2 Nxd4+ 27.Nxd4 Rxc3+ -+ (-5.00) Depth: 9 00:00:32 16342kN 24.Rxg6+ hxg6 25.Qg4 Qb6 26.Rd2 Nxd4 27.Nxd4 Rxc3 -+ (-4.53) Depth: 9 00:00:48 23947kN 24.Bxg6 -+ (-4.53) Depth: 9 00:00:49 24808kN 24.Bxg6 -+ (-4.53) Depth: 9 00:00:57 28581kN 24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Rh1 Bh4 µ (-1.04) Depth: 9 00:01:08 34393kN 24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Bd3 Bg4 = (0.19) Depth: 10 00:01:58 59796kN ( 6:00 minutes of searching) (Byrne, Secane, PA USA 27.08.2003) Evans,L - Pilnick,C 2r2rk1/p3bb1p/2n1Q1p1/q2pP3/3P1P2/p1NB1NR1/1P4P1/1K1R4 w - - 0 1 Analysis by Deep Fritz 7: 24.Qh3! -+ (-2.81) Depth: 5/29 00:00:00 203kN 24.Qh3 axb2 25.Rh1 Qa1+ 26.Kc2 -+ (-4.94) Depth: 6/33 00:00:00 342kN 24.Qd7! -+ (-4.91) Depth: 6/33 00:00:00 471kN 24.Qd7! -+ (-4.75) Depth: 6/33 00:00:00 497kN 24.Qd7 axb2 25.Be2 Qxc3 26.e6 Nb4 -+ (-4.50) Depth: 6/33 00:00:00 531kN 24.Qf5! -+ (-4.47) Depth: 6/33 00:00:00 547kN 24.Qg4! -+ (-4.44) Depth: 6/33 00:00:00 611kN 24.Qg4! -+ (-4.28) Depth: 6/33 00:00:00 618kN 24.Qg4-- -+ (-4.56) Depth: 7/27 00:00:00 659kN 24.Qg4 axb2 25.Qd7 Nxd4 26.Nxd4 -+ (-5.09) Depth: 7/32 00:00:00 776kN 24.Qd7! -+ (-5.06) Depth: 7/32 00:00:01 818kN 24.Qd7! -+ (-4.91) Depth: 7/32 00:00:01 823kN 24.Qd7! -+ (-4.59) Depth: 7/32 00:00:01 835kN 24.Qd7 axb2 25.Be2 Qxc3 26.e6 Nb4 -+ (-4.50) Depth: 7/32 00:00:01 842kN 24.Qd7! -+ (-4.22) Depth: 8/33 00:00:01 1085kN 24.Qd7! -+ (-3.94) Depth: 8/33 00:00:01 1159kN 24.Qd7-- -+ (-4.22) Depth: 9/28 00:00:03 2056kN 24.Qd7 axb2 25.e6 -+ (-4.22) Depth: 9/41 00:00:06 4729kN 24.Bxg6! -+ (-4.19) Depth: 9/41 00:00:06 5343kN 24.Bxg6! -+ (-4.03) Depth: 9/41 00:00:06 5409kN 24.Bxg6! -+ (-3.72) Depth: 9/41 00:00:07 5520kN 24.Bxg6! -+ (-3.09) Depth: 9/41 00:00:07 5694kN 24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Rh1 Rxf4 27.Bf5+ Bh4 -+ (-1.50) Depth: 9/41 00:00:08 6495kN 24.Bxg6! µ (-1.22) Depth: 10/37 00:00:09 7434kN 24.Bxg6! µ (-0.94) Depth: 10/37 00:00:09 7741kN 24.Bxg6! ³ (-0.66) Depth: 11/40 00:00:13 10426kN 24.Bxg6! ³ (-0.37) Depth: 11/40 00:00:13 11202kN 24.Bxg6! = (0.19) Depth: 11/40 00:00:15 12970kN 24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Rh1 Rxf4 27.Bf5+ Bh4 28.Nxh4 Rf1+ 29.Rxf1 a2+ 30.Ka1 Re8 31.Ng6+ Kh7 ± (1.13) Depth: 11/42 00:00:19 16476kN 24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Rh1 Rxf4 27.Bf5+ Bh4 28.Nxh4 Rf1+ 29.Rxf1 a2+ 30.Ka1 Re8 31.Ng6+ ± (1.13) Depth: 12/38 00:00:38 34179kN (Byrne, Secane, PA USA 27.08.2003) Evans,L - Pilnick,C 2r2rk1/p3bb1p/2n1Q1p1/q2pP3/3P1P2/p1NB1NR1/1P4P1/1K1R4 w - - 0 1 Analysis by Hiarcs 8: 24.Qh3 axb2 -+ (-2.52) Depth: 1 00:00:00 24.Qh3 axb2 -+ (-2.52) Depth: 2/7 00:00:00 24.Qh3 axb2 -+ (-2.52) Depth: 2/8 00:00:00 24.Qd7 axb2 25.Nb5 -+ (-1.73) Depth: 2/8 00:00:00 24.Qd7 axb2 -+ (-2.13) Depth: 3/9 00:00:00 24.Qd7 axb2 25.Kc2 Qa3 -+ (-2.80) Depth: 3/13 00:00:00 24.Qh3 Qb4 25.Rd2 Nxd4 26.Nxd4 Qxd4 27.Qh6 -+ (-1.90) Depth: 3/13 00:00:00 24.Qh3 Qb4 -+ (-2.16) Depth: 4/13 00:00:00 24.Qh3 Qb4 -+ (-2.16) Depth: 4/18 00:00:00 24.Qh3 Qb4 -+ (-2.41) Depth: 5/18 00:00:00 13kN 24.Qh3 axb2 25.Na4 Nxe5 26.Nxb2 Nxd3 27.Nxd3 Rb8+ 28.Nb2 -+ (-3.94) Depth: 5/22 00:00:00 32kN 24.Qd7 axb2 25.e6 Qa1+ 26.Kc2 Nb4+ 27.Kd2 Rxc3 28.exf7+ Rxf7 29.Qe8+ Bf8 30.Bb1 -+ (-3.70) Depth: 5/22 00:00:00 43kN 24.Qd7 axb2 -+ (-3.45) Depth: 6/27 00:00:01 95kN 24.Qd7 axb2 -+ (-3.45) Depth: 6/27 00:00:01 105kN 24.Qd7 axb2 -+ (-3.70) Depth: 7/29 00:00:02 183kN 24.Qd7 axb2 25.e6 Qa1+ -+ (-3.78) Depth: 7/31 00:00:05 503kN 24.Bxg6 Bxe6 -+ (-3.20) Depth: 7/31 00:00:07 795kN 24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Rh1 Rxf4 27.Bc2+ Bh3 28.Rgxh3+ Bh4 29.Rxh4+ Rxh4 30.Rxh4+ Kg7 -+ (-1.51) Depth: 7/31 00:00:10 1070kN 24.Bxg6 Bxe6 µ (-1.26) Depth: 8/31 00:00:17 1929kN 24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Rh1 Rxf4 27.Bd3+ Bh4 28.Nxh4 Rf1+ 29.Bxf1 Bg8 30.Nf5+ Bh7 31.Bd3 ± (1.15) Depth: 8/31 00:00:33 3691kN 24.Bxg6 Bxe6 25.Bxh7+ Kh8 26.Rh1 Rxf4 27.Bd3+ Bh4 28.Nxh4 Rf1+ 29.Bxf1 Bg8 ± (1.15) Depth: 9/31 00:00:57 6368kN (Byrne, Secane, PA USA 27.08.2003)
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