Author: Geo Disher
Date: 13:55:48 03/08/06
Go up one level in this thread
You may be wrong about Qb6 being the best move. Rybka finds axb5 as best also after 17 hours of eval. New game r1r1q1k1/6p1/p2b1p1p/1p1PpP2/PPp5/2P4P/R1B2QP1/R5K1 w - - 0 1 Analysis by Rybka 1.0 Beta 32-bit: 1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5 +- (1.57) Depth: 4 00:00:00 1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5 +- (1.57) Depth: 4 00:00:00 1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5 +- (1.82) Depth: 5 00:00:00 1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5 +- (2.06) Depth: 6 00:00:00 5kN 1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5 +- (1.73) Depth: 7 00:00:00 10kN 1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5 +- (1.83) Depth: 8 00:00:00 13kN 1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5 +- (1.73) Depth: 9 00:00:00 17kN 1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5 +- (1.95) Depth: 10 00:00:00 37kN 1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5 +- (1.86) Depth: 11 00:00:01 44kN 1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5 +- (1.77) Depth: 12 00:00:02 116kN 1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5 +- (1.68) Depth: 13 00:00:03 199kN 1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5 +- (1.65) Depth: 14 00:00:04 298kN 1.Qb6 Rd8 2.Be4 Be7 3.axb5 Rd6 4.Qa5 Bd8 5.Qa4 a5 +- (1.63) Depth: 15 00:00:05 450kN 1.Qb6 Qe7 2.axb5 Rab8 3.Qxa6 e4 4.Qa7 Qe5 5.Qe3 Re8 +- (1.65) Depth: 16 00:00:10 1369kN 1.Qb6 Qe7 2.axb5 Rab8 3.Qxa6 e4 4.Qa7 Qe5 5.Qe3 Re8 +- (1.65) Depth: 17 00:00:46 5181kN 1.Qb6 Qe7 2.axb5 Rab8 3.Qxa6 e4 4.Qa7 Qe5 5.Qe3 Re8 +- (1.55) Depth: 18 00:01:54 12780kN 1.Qb6 Qe7 2.axb5 Rab8 3.Qxa6 e4 4.Qa7 Qe5 5.Qe3 Re8 +- (1.75) Depth: 19 00:03:47 26970kN 1.Qb6 Qe7 2.axb5 Rab8 3.Qxa6 e4 4.Qa7 Qe5 5.Qe3 Re8 +- (1.70) Depth: 20 00:06:27 46469kN 1.Qb6 Qe7 2.axb5 Rab8 3.Qxa6 e4 4.Qa7 Qe5 5.Qe3 Re8 +- (1.59) Depth: 21 00:12:58 89868kN 1.Qb6 Qe7 2.axb5 Rab8 3.Qxa6 e4 4.Qa7 Qe5 5.Qe3 Re8 +- (1.53) Depth: 22 00:32:35 215285kN 1.Qb6 Qe7 2.axb5 Rab8 3.Qxa6 ± (1.39) Depth: 23 01:11:34 454452kN 1.Qb6 Qe7 2.axb5 +- (1.52) Depth: 24 02:27:32 937211kN 1.Qb6 Qe7 ± (1.26) Depth: 25 07:55:22 2876850kN 1.axb5 axb5 ± (1.28) Depth: 25 17:10:17 2876850kN (, 08.03.2006) On March 04, 2006 at 01:10:21, Uri Blass wrote: >On March 04, 2006 at 00:50:36, Stuart Cracraft wrote: > >>On March 03, 2006 at 22:39:47, Lar Mader wrote: >> >>>Ok, I know this topic has been discussed a lot (beaten to death?!), but I am >>>still curious about this move: >>> >>>Game 2, IBM Kasparov vs. Deep Blue Rematch >>>Deep Blue played >>> 36.axb5 >>> >>>I know that the move 37.Be4 is a move that is found by some current chess >>>engines. >>> >>>But this 36.axb5, to my knowledge, is never selected by current chess engines. >>> >> >>Nothing for me but that doesn't say much considering my own program: >> >>.sd 99 >>maxdepth = 99 maxtime = 9999999 timed = 0 >>.ts >>position file? [wac.epd] tests.epd >># of test positions to test? 1 >>maxtime = 9999999 >>Interrupt current ply and return move at timeout >>Testsuite: Tests/tests.epd 1 positions >>*** Problem Solution(s): axb5 (bm) >>BR ** BR ** BQ ** BK ** >>** -- ** -- ** -- BP -- >>BP ** -- BB -- BP -- BP >>** BP ** WP BP WP ** -- >>WP WP BP ** -- ** -- ** >>** -- WP -- ** -- ** WP >>WR ** WB ** -- WQ WP ** >>WR -- ** -- ** -- WK -- >>mv 1 stage 0, white to move, computer plays white >>hash=13ae1dd545f1642d >>pawnhash=38fa81d61563fda8 >>0 0 0 0 0 0 >>Alpha=1457 Beta=2258 Maxdepth=99 MaxTime=9999999 xboard=0 >>Itr/Max Mv Score Time Nodes PV >> 1/ 4< a4b5 1457 0.00 37 a4b5 >> 1/ 4 g1h2 288 0.01 82 g1h2 >> 2/ 6> g1h2 688 0.02 269 g1h2 e5e4 g2g3 >> 2/ 7 a4b5 689 0.02 388 a4b5 a6b5 a2a7 >> 3/ 9 a4b5 698 0.05 1010 a4b5 a6b5 a2a7 e8f8 >> 4/10 f2b6 349 0.10 2932 f2b6 d6c7 b6f2 >> 5/13 f2b6 629 0.25 8081 f2b6 d6c7 b6e6 e8e6 f5e6 b5a4 a2a4 c7b6 g1h2 >> 6/14 f2b6 720 0.54 18844 f2b6 d6c7 b6e6 e8e6 f5e6 c8d8 a4b5 >> 7/16 f2b6 848 1.74 60879 f2b6 d6b8 b6e6 e8e6 f5e6 b8a7 g1h2 c8f8 a4b5 >> 8/19 f2b6 1001 3.19 115760 f2b6 d6c7 b6e6 e8e6 f5e6 c7b6 g1h2 c8e8 a4b5 >>a6b5 a2a8 >> 9/21 f2b6 1175 8.05 308035 f2b6 e8e7 a4b5 c8b8 b6c6 b8c8 g1h2 c8e8 >>10/21 f2b6 1125 16.45 639593 f2b6 d6c7 b6b7 e8d8 a4b5 c8b8 b7c6 b8b5 a2a6 >>a8a6 a1a6 b5d5 c6c4 >>11/23 f2b6 1415 37.50 1488255 f2b6 d6c7 b6e6 e8e6 f5e6 a8b8 a4b5 a6b5 c2g6 >>c7d6 a2a7 >>12/27 f2b6 1450 91.88 3725097 f2b6 e8f8 a4b5 c8b8 b6a5 d6c5 b4c5 f8c5 g1h2 >>b8b5 a5a4 c5d5 a1d1 >>13/33 f2b6 1499 208.56 8436384 f2b6 d6c7 b6e6 e8e6 f5e6 a8b8 >>14/ >> >>People have consistently underestimated Deep Bluer's evaluation function. >> >>Bob Hyatt can speak more to your concerns than any other person on this >>forum. >> >>Stuart > >I think that Qb6 is the right move and deeper blue's move was not correct. > >Evaluation function is a lot about having the right parameters and not only >about knowledge and it is known that the deep blue team had not enough time to >tune their evaluation function so I see no reason to assume that deep blue's >evaluation was better than the evaluation function of the programs of today. > >Uri
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