Author: Uri Blass
Date: 23:46:14 12/07/01
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On December 07, 2001 at 21:03:20, Dann Corbit 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. > >Quite an interesting position... >[D] 2kr3r/ppp2ppp/1b3nq1/4p2b/1PB1P3/2P1B3/P1QN1PPP/R4RK1 b - - > >It appears that Quark is the only engine to carefully consider Rxd2: >position 1 > 5 102 5 16684 b6e3 f2e3 g6g5 a1e1 c7c6 > 5 102 6 21481 b6e3 f2e3 g6g5 a1e1 c7c6 > 6 78 10 37153 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 > 6 78 14 51152 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 > 7 96 20 78321 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6f6 > 7 96 32 132732 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6f6 > 8 84 61 250523 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6c6 c4d5 > 8 84 88 385576 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6c6 c4d5 > 9 81 424 1576731 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6g5 a2a4 g5h4 > 9 81 597 2364464 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6g5 a2a4 g5h4 >10 93 1252 4874575 b6e3 f2e3 g6g5 f1e1 d8d6 a2a4 h8d8 d2f1 d6c6 c4d3 >10 93 1411 5598432 b6e3 f2e3 g6g5 f1e1 d8d6 a2a4 h8d8 d2f1 d6c6 c4d3 >11 111 2236 8933072 b6e3 f2e3 g6g5 f1e1 d8d6 c4f1 f6g4 d2c4 d6f6 c2a4 >a7a6 >11 111 2744 11187292 b6e3 f2e3 g6g5 f1e1 d8d6 c4f1 f6g4 d2c4 d6f6 c2a4 >a7a6 >12 109 5143 21088556 b6e3 f2e3 d8d7 f1f2 h8d8 h2h3 g6g3 d2f1 g3h4 g2g4 >h5g6 c4b5 >12 109 6579 27904369 b6e3 f2e3 d8d7 f1f2 h8d8 h2h3 g6g3 d2f1 g3h4 g2g4 >h5g6 c4b5 >13 118 10994 46376265 b6e3 f2e3 d8d7 h2h3 g6g5 a1e1 g5g3 g1h1 h8d8 d2b3 >c7c6 a2a4 h7h6 >13 119 15729 70062407 d8d2! >13 122 16497 73654902 d8d2 c2d2 f6e4 d2d3 h8d8 d3b1 b6e3 f2e3 d8d2 g2g3 >e4c3 b1g6 f7g6 >13 122 18540 83286233 d8d2 c2d2 f6e4 d2d3 h8d8 d3b1 b6e3 f2e3 d8d2 g2g3 >e4c3 b1g6 f7g6 >14 108 25489 118020562 d8d2 c2d2 f6e4 d2d3 h8d8 d3b1 e4c3 b1g6 h5g6 e3b6 >a7b6 a1c1 c3d5 f1e1 > >Although Quark eventually switches back to Bxe3 > > >Beowulf: >Current Position = -0.50 >Number of Possible Moves = 40 > > 6 73 69 59143 b6e3 f2e3 g6g5 g2g4 g5e3 g1h1 > 7 88 143 112576 b6e3 f2e3 g6h6 a1e1 f6g4 d2f3 g4e3 > 8 88 321 301998 b6e3 f2e3 g6h6 f1e1 h6g5 a2a4 c8b8 g2g3 > 9 101 631 702259 b6e3 f2e3 g6g5 f1e1 c8b8 a2a4 d8d7 a1d1 > 10 92 2057 2614250 b6e3 f2e3 g6g5 f1e1 d8d7 g1h1 h8d8 d2f3 h5f3 >g2f3 > 11 121! 4382 6327992 b6e3 f2e3 g6g5 f1e1 d8d7 g1h1 h8d8 a1d1 > 11 121 4778 6862582 b6e3 f2e3 g6g5 f1e1 d8d7 g1h1 h5g6 d2f3 d7d1 >a1d1 f6e4 > 12 131 24383 31707509 b6e3 f2e3 g6g5 f1e1 d8d7 g1h1 h8d8 d2f3 h5f3 >g2f3 d7d2 c2a4 > 12 131 99900 114152522 b6e3 f2e3 g6g5 f1e1 d8d7 g1h1 h8d8 d2f3 h5f3 >g2f3 d7d2 c2a4 > >Search Time : 999.0 Seconds >Total Nodes Searched : 114152522 (89.5% Qui) >Total Nodes Evaluated : 102160016 >Cuts : Delta 22748279 : SEE 22807388 : Mate 0 > : Razor 7443478 : Eval 55013059 >Extensions : Check 2313832 : OneRep 83541 : CMThreat 26069 > : Pawn 2344 : Recap 321588 : RevCheck 68378 >Hash Stores (Size) : 7870372 (5592373) >Hash Probes (Hits) : 62166883 (6031179) >EGTB Probes (Hits) : 0 (0) >Move Ordering : 69.4% >Best Move = b6e3 >[1]B > > >Phalanx: > -> easy move (1) Bb6xe3 > 5 -> 0:00.74 98470 0 turns > 6 106 100 140314 Bb6xe3 Pf2xe3 Qg6-g5 Rf1-e1 Nf6-g4 Nd2-f1 > Rh8-e8 > 6 -> 0:01.47 215458 0 turns > 7 79 703 397895 Bb6xe3 Pf2xe3 Nf6-g4 Rf1-e1 > 7 -> 0:21.08 889754 0 turns > 8 99 2551 1628993 Bb6xe3 Pf2xe3 Qg6-g5 Rf1-e1 Rh8-e8 Bc4-b5 > Re8-e6 Nd2-f1 Kc8-b8 > 8 -> 0:31.70 2689478 0 turns > 9 84 4098 4424999 Bb6xe3 Pf2xe3 Qg6-g5 Rf1-e1 Rd8-d6 Bc4-b5 > Pa7-a6 Bb5-c4 Nf6-g4 Nd2-f1 > 9 -> 1:01.44 8361639 0 turns > 10 101 10838 16723310 Bb6xe3 Pf2xe3 Qg6-g5 Rf1-e1 Rd8-d6 Bc4-b5 > Pa7-a6 Bb5-c4 Nf6-g4 Nd2-f1 Rh8-d8 > 10 -> 2:32.27 24687615 0 turns > 11 101 25825 44607004 Bb6xe3 Pf2xe3 Rd8-d7 Nd2-f3 > 11 -> 6:18.19 66805774 0 turns > >Chess Tiger 14: >2kr3r/ppp2ppp/1b3nq1/4p2b/1PB1P3/2P1B3/P1QN1PPP/R4RK1 b - - ce 92; acd 15; acs >999; pv Bxe3 fxe3 Rhe8 Rae1 Re7 Be2 Bxe2 Rxe2 Red7 Nc4 Qxe4 Qxe4 Nxe4 Nxe5 Rd1 >Nxf7 Nxc3; > >Gambit Tiger II: >2kr3r/ppp2ppp/1b3nq1/4p2b/1PB1P3/2P1B3/P1QN1PPP/R4RK1 b - - ce 114; acd 14; acs >999; pv Bxe3 fxe3 Rd7 Nf3 Re8 Qa4 a6 Bb5 c6 Bxc6 bxc6 Qxc6+ Kb8 Qb6+ Rb7 Qd6+ >Ka7 Qc5+; > >Little Goliath 3: >2kr3r/ppp2ppp/1b3nq1/4p2b/1PB1P3/2P1B3/P1QN1PPP/R4RK1 b - - ce 124; acd 13; acs >999; pv Bxe3 fxe3 Rd7 Nf3 Bxf3 Rxf3 Qxe4 Qxe4 Nxe4 Rxf7 Rxf7 Bxf7 Nxc3 Be6+ Kd8 >Bc4 Ke7; > >Crafty: >2kr3r/ppp2ppp/1b3nq1/4p2b/1PB1P3/2P1B3/P1QN1PPP/R4RK1 b - - ce 117; acd 15; acs >999; pv Bxe3 fxe3 Rd6 Bb3 Be2 Nc4 Bxc4 Bxc4 Nxe4 Bxf7 Qg4 c4 Rd2 Be6+ Qxe6 Qxe4 >Kb8 a4; > >ExChess: >2kr3r/ppp2ppp/1b3nq1/4p2b/1PB1P3/2P1B3/P1QN1PPP/R4RK1 b - - ce 134; acd 14; acs >999; pv Bxe3 fxe3 Rd7 Nf3 Bxf3 Rxf3 Qxe4 Qxe4 Nxe4 Rxf7 Rxf7 Bxf7 Nxc3 Be6+ Kb8 >Rf1 Rd8; > >Pepito: >2kr3r/ppp2ppp/1b3nq1/4p2b/1PB1P3/2P1B3/P1QN1PPP/R4RK1 b - - ce 74; acd 15; acs >999; pv Bxe3 fxe3 Rd6 Bb3 Be2 Nc4 Bxc4 Bxc4 Rhd8 Rad1 Rxd1 Rxd1 Rxd1+ Qxd1 Qxe4 >Qe2 Ng4 Bxf7 Nxe3 a4; > > >Of course, since this was a correspondence game, we should really let the >computers think overnight. > >I strongly suspect that both Chess Tiger and Gambit Tiger will find the move >under those circumstances. Both engines had a very long think on their last >iteration, so the evaluation between the chosen move and the key move was close >already. I also suspect that they may find another win by Bxe3 Uri
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