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Subject: Re: Game 2, IBM Kasparov vs. Deep Blue, move 36.axb5

Author: Stuart Cracraft

Date: 21:50:36 03/03/06

Go up one level in this thread


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



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