Author: Uri Blass
Date: 13:52:35 09/11/00
Go up one level in this thread
On September 11, 2000 at 14:59:52, Mogens Larsen wrote: >On September 11, 2000 at 14:20:33, Chessfun wrote: > >>>Here is one blunder of Gandalf4.32f against Crafty >>> >>>[D]r4rk1/3p1ppp/1pb1p3/p1b1P2B/2P2B1q/P1N5/1PQ2PPP/3R1RK1 w - - 0 1 > >>Maybe Christian could check, but others in limited time modes would >>alos play this move: As the time controls were 40/40' it can be guessed >>the move took maybe 2 minutes. > >That is a reasonable assumption. Probably slightly less. > >>Crafty 17-13N takes 3:30 on my machine to switch to Bg3. >>Fritz 6b takes 0:46 to switch to Bg3. > >Gandalf analysis: >10440 <first : 2 94 0 254 g4 Qh3 >10440 <first : 2 97 10 515 b4 !! >10440 <first : 2 257 10 606 b4 axb4 axb4 Qxf4 bxc5 Qxe5 >10490 <first : 3 203 10 2531 b4 axb4 axb4 Bxb4 Na2 Qxf4 Nxb4 Qxe5 Nxc6 >dxc6 >10550 <first : 4 60 10 10447 b4 axb4 axb4 Bxb4 Na2 Rxa2 Qxa2 Qxf4 >10550 <first : 4 64 10 12475 g4 !! >10550 <first : 4 112 20 16188 g4 f5 exf6 Rxf6 Bd6 >10770 <first : 5 68 40 44395 g4 Qh3 Nd5 exd5 cxd5 >11210 <first : 6 67 80 130466 g4 Qh3 Nd5 exd5 Rd3 Qh4 cxd5 >12640 <first : 7 67 220 386080 g4 Qh3 Nd5 exd5 Rd3 Qh4 cxd5 >15600 <first : 8 73 520 1054513 g4 Qh3 Nd5 exd5 Rd3 Qh4 cxd5 Bb7 >23950 <first : 9 54 1360 2774173 g4 Qh3 Nd5 exd5 Rd3 Qh4 Bg3 Qg5 cxd5 >83160 <first : 10 51 7280 13997968 g4 f5 exf6 g6 Bg3 Qxf6 g5 Qxg5 Be2 Qh6 >193780 <first: 11 -4 18340 36003605 g4 Qh3 Nd5 Qf3 Rd3 Qe4 Rd2 exd5 Qxe4 >dxe4 >417160 <first: 11 -1 40680 83217254 Bg3 !! >473020 <first: 11 9 46270 93970165 Bg3 Qxh5 Kh1 a4 f3 h6 Ne4 Qg6 Rfe1 Rfc8 > >The score drops after about 3 minutes on my computer and Bg3 found after almost >7 minutes, so with standard timecontrol, fast computer and hashdata the move >would probably be different :o). Only a slight chance with 40/40' IMHO. I think that a better time allocation can help to find the move. My opinion is that gandalf does the same mistake that other programs do in time allocation. It needs more than 3 minutes to calculate the exact score of g4 but I guess that it needs less than it to see that the move fail low. g4 is a move that you can suspect that it is wrong because of king safety problems so the fact that the main line begins with g4 should encourage the program to use more time. The fact that the score dropped with g4 should also encourage it to use more time. The evaluation showed the scores: 73 depth 8 54 depth 9 51 depth 10 The fact that the evaluation is positive and goes down should encourage the program to use significantly more time. It is risky to use significantly more time in this case when you have not many move to the time control but it is not risky when you have 25 moves to the time control. Using twice than the regular time even before seeing the fail low at depth 11 in this situation is not risky and the regular time is clearly more than 1 minute because part of the moves were in book. After seeing the fail low it is clear that it should use more time. Uri
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