Author: Ed Schröder
Date: 23:36:55 12/07/01
Go up one level in this thread
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.
That's right, this is a deep one. Had mine run overnight, takes about 4 hours.
Ed
===========================================
00:50:53 16.00 1.05 1..Bxe3 2.fxe3 Rd6 3.Nf3 Qxe4 4.Qxe4
Nxe4 5.Nxe5 f6 (811)
03:03:53 17.00 1.02 1..Bxe3 2.fxe3 Rd7 3.Nf3 Bxf3 4.Rxf3
Nxe4 (5096)
03:43:29 17.15 1.02 1..Rxd2
04:04:16 17.15 1.46 1..Rxd2 2.Qxd2 Rd8 3.Bd5 Bf3 4.Bg5
c6 (13409)
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.