Author: Uri Blass
Date: 11:09:56 12/07/01
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On December 07, 2001 at 13:53:01, Leo Dijksman wrote: >On December 07, 2001 at 12:48:22, ALI MIRAFZALI wrote: > >>The following position occured in one of the oldest Correspondence games >>played in America: >>[D] 2kr3r/ppp2ppp/1b3nq1/4p2b/1PB1P3/2P1B3/P1QN1PPP/R4RK1 b - 0 1 >>This game was played in 1840. >>Here black played 15...Rxd2!! Game finished with 16.Qxd2 Nxe4 17.Qc1 Bf3 >>18.g3 h5! 19.Bd5 h4 20.Bxe4 Qxe4 21.Bxb6 Qg4 22.Qe3 axb6 23.R(f)-b1 e4 >>24.Qe1 f5! 25.Rb2 f4 26.R(a)-b1 Black announced Mate in Some number of moves. >>Fritz 6 and chessmaster 8000 donot see 15...Rxd2!! No matter how long one runs >>the position. >>Does your program see 15...Rxd2!!!.Althuogh Tactics is the area that Computers >>are naturally strong ;it is interesting that one still runs into tactical >>positions which programs cannot solve.Please indicate your result. > >Quark analises: > >Input to Quark: analyze > 1 48 1 687 b6e3 > 2 48 1 885 b6e3 f2e3 > 3 69 1 1767 b6e3 f2e3 g6g5 > 4 78 3 8530 b6e3 f2e3 g6g5 g1f2 > 5 102 6 16682 b6e3 f2e3 g6g5 a1e1 c7c6 > 5 102 8 21536 b6e3 f2e3 g6g5 a1e1 c7c6 > 6 78 12 37204 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 > 6 78 15 51210 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 > 7 96 22 78308 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6f6 > 7 96 32 132901 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6f6 > 8 84 61 251362 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6c6 c4d5 > 8 84 85 385845 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6c6 c4d5 > 9 81 425 1609169 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6g5 a2a4 g5h4 > 9 81 577 2391642 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6g5 a2a4 g5h4 >10 93 1238 5043519 b6e3 f2e3 g6g5 f1e1 d8d6 a2a4 h8d8 d2f1 d6c6 c4d3 >10 93 1375 5763372 b6e3 f2e3 g6g5 f1e1 d8d6 a2a4 h8d8 d2f1 d6c6 c4d3 >11 111 2097 8959777 b6e3 f2e3 g6g5 f1e1 d8d6 c4f1 f6g4 d2c4 d6f6 c2a4 >a7a6 >11 111 2552 11193988 b6e3 f2e3 g6g5 f1e1 d8d6 c4f1 f6g4 d2c4 d6f6 c2a4 >a7a6 >12 109 4584 20252371 b6e3 f2e3 d8d7 f1f2 h8d8 h2h3 g6g3 d2f1 g3h4 g2g4 >h5g6 c4b5 >12 109 5878 27069281 b6e3 f2e3 d8d7 f1f2 h8d8 h2h3 g6g3 d2f1 g3h4 g2g4 >h5g6 c4b5 >13 118 9915 44695206 b6e3 f2e3 d8d7 h2h3 g6g5 a1e1 g5g3 g1h1 h8d8 d2b3 >c7c6 a2a4 h7h6 >13 119 14334 68847269 d8d2 ! >13 122 15096 72748195 d8d2 c2d2 f6e4 d2d3 h8d8 d3b1 b6e3 f2e3 d8d2 g2g3 >e4c3 b1g6 f7g6 >13 122 16963 82356307 d8d2 c2d2 f6e4 d2d3 h8d8 d3b1 b6e3 f2e3 d8d2 g2g3 >e4c3 b1g6 f7g6 >Input to Quark (in pondering): exit >Input to Quark: force >Input to Quark: quit > >Leo. I think that it is a positional problem because programs can find the move for positional reasons It is interesting to see the evaluation of quark after 1...Rxd2 2.Qxd2 Nxe4 3.Qc1 that was in the game. yace (only material pawn 0.8 knight 3.4 bishop 3.5 rook 5) start to see bad news for black after more than 30 minutes and the line 3...Bf3 4.g3 h5 but I did not check if all the moves are forced and I did not give yace to complete iteration 15 New position [D]2k4r/ppp2pp1/1b4q1/4p2p/1PB1n3/2P1BbP1/P4P1P/R1Q2RK1 w - h6 0 1 Analysis by Yace 0.99.56: 5.Bxb6 cxb6 ± (0.80) Depth: 1 00:00:00 5.Bxb6 cxb6 ± (0.80) Depth: 2 00:00:00 5.Bxb6 cxb6 6.Bd5 h4 ± (0.80) Depth: 3 00:00:00 5.Bxb6 cxb6 6.Bd5 h4 7.Bc4 ± (0.80) Depth: 4 00:00:00 5.Bxb6 cxb6 6.Re1 Qf6 7.Be2 Bxe2 ± (0.80) Depth: 5 00:00:00 8kN 5.Bxb6 cxb6 6.Re1 Qf6 7.Be2 Bxe2 8.Rxe2 ± (0.80) Depth: 6 00:00:00 30kN 5.Bxb6 cxb6 6.Re1 Qf6 7.Be2 Bxe2 8.Rxe2 Nd6 ± (0.80) Depth: 7 00:00:00 61kN 5.Bxb6 h4 6.Re1 hxg3 7.fxg3 Nxg3 8.Re2 Nxe2+ 9.Kf1 ² (0.40) Depth: 8 00:00:01 553kN 5.Bxb6 h4 6.Qe3 hxg3 7.Qxf3 gxf2+ 8.Kh1 Ng3+ 9.Kg2 Ne4+ 10.Kh1 Rxh2+ 11.Kxh2 Qf6 = (0.00) Depth: 8 00:00:01 575kN 5.Bd3 Bxe3 6.Qxe3 Nxc3 7.Bxg6 Ne2+ 8.Qxe2 Bxe2 9.Bxf7 h4 = (0.01) Depth: 8 00:00:01 575kN 5.Bd3 h4 6.Bxe4 Bxe4 7.Re1 hxg3 8.fxg3 Qh6 9.Bxb6 Qxb6+ 10.Kf1 ² (0.70) Depth: 8 00:00:02 1088kN 5.Bd3 h4 6.Bxe4 Bxe4 7.Re1 hxg3 8.fxg3 Qh6 9.h3 Bxe3+ 10.Rxe3 f5 ² (0.70) Depth: 9 00:00:06 2721kN 5.Bd3 h4 6.Bxe4 Bxe4 7.Bc5 Bxc5 8.bxc5 b6 9.cxb6 axb6 10.Re1 hxg3 ² (0.70) Depth: 10 00:00:12 6635kN 5.Bd3 Qg4 6.Bxe4 Bxe4 7.f4 Qh3 8.Rf2 exf4 9.Bxb6 fxg3 10.Qb1 Bxb1 11.Rxb1 ² (0.30) Depth: 11 00:00:38 20815kN 5.Bd3 Qg4 6.Bxe4 Bxe4 7.f3 Bxf3 8.Bxb6 cxb6 9.Qe3 e4 10.Rfe1 Qh3 11.Qd4 = (-0.10) Depth: 11 00:00:43 23611kN 5.Bxb6 h4 6.Qe3 hxg3 7.Qxf3 gxf2+ 8.Kh1 Ng3+ 9.Kg2 Nxf1+ 10.Kxf1 cxb6 11.Qxf2 Qe6 12.Bxe6+ fxe6 = (-0.09) Depth: 11 00:01:07 36714kN 5.Bxb6 h4 6.Qe3 hxg3 7.Qxf3 gxf2+ 8.Kh1 Ng3+ 9.Kg2 Ne4+ 10.Kh1 = (0.00) Depth: 11 00:01:15 40225kN 5.Bxb6 h4 6.Qe3 Qh5 7.Bxf7 Ng5 8.Be6+ Nxe6 9.Bc5 Ng5 10.Rfe1 hxg3 11.Qxf3 Nxf3+ 12.Kf1 ³ (-0.40) Depth: 13 00:06:24 199409kN 5.Bxb6 h4 6.Qe3 Qh5 7.Bxf7 Ng5 8.h3 Nxh3+ 9.Kh2 hxg3+ 10.fxg3 Qxf7 µ (-1.09) Depth: 13 00:12:02 375801kN 5.Bd3 Qg4 6.Bxe4 Bxe4 7.f3 Bxf3 µ (-1.08) Depth: 13 00:12:52 403334kN 5.Bd3 Qg4 6.Bxe4 Bxe4 7.f3 Bxf3 8.Bxb6 axb6 9.Qe3 e4 10.Rf2 Kb8 11.Kf1 Qh3+ 12.Kg1 Rd8 = (-0.10) Depth: 13 00:15:09 476507kN 5.Bd3 Qg4 6.Bxe4 Bxe4 7.f3 Bxf3 8.Bxb6 axb6 9.Qe3 e4 10.Rf2 Kb8 11.Kf1 Qh3+ 12.Kg1 Rd8 13.c4 = (-0.10) Depth: 14 00:22:57 733061kN 5.Bd3 h4 6.Bxe4 Bxe4 7.Bc5 Qh5 8.Qd1 Bf3 9.Qd2 Be2 10.Bxb6 hxg3 11.Kg2 Bxf1+ 12.Rxf1 cxb6 13.Re1 ³ (-0.50) Depth: 15 00:38:52 1231436kN (Blass, Tel-aviv 07.12.2001) Uri
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