Author: Uri Blass
Date: 16:28:01 07/30/02
Go up one level in this thread
On July 30, 2002 at 16:14:59, Peter McKenzie wrote: >On July 30, 2002 at 11:16:02, Richard Bean wrote: > >>On July 30, 2002 at 05:36:55, Peter McKenzie wrote: >> >>>>>2. Was Junior's -Rxc4 sac against Brutus really correct? I doubt a lot >>>>>personally. >>>> >>>>to me as a 2200 player this sac looks terrific. i don't doubt it is correct. >>>>unfortunately, there was no discussion here. if you post any stupid "mate in X" >>> >>>Would you mind posting it again, I haven't seen the position yet. >> >>r1r5/3nbpk1/4qnp1/4p1Bp/1pN1P3/1PP2Q2/4N1PP/3R1R1K b - - 0 26 >> >>[D]r1r5/3nbpk1/4qnp1/4p1Bp/1pN1P3/1PP2Q2/4N1PP/3R1R1K b - - 0 26 > >Thanks for posting that. >My program prefers to play Rab8 with a score of about +.14 for white. > >Alternatively if I play Rxc4 and search from there, the score slowly drops. >After a couple of hours it is +0.44 for white. It would be interesting to know >what Junior's score was when playing this move, and what its score for Rab8 was. > >cheers, >Peter It may be interesting also to see the main line after Rxc4. Here is the main line of movei(the score of movei is also dropping every iteration and after some hours it goes to 0.52 with the line bxc4 b3 Rd5 Rb8 Rb5 Rxb5 cxb5...) I guess that movei cannot find Rxc4 from the original position because white probably does not have +0.5 after Rab8 but only smaller score and Rab8 is only one option and I am not sure if movei is going to choose it. The last line of analysis from the winboard.debug file after Rxc4. 14 52 1141011 1456084697 b3c4 b4b3 d1d5 a8b8 d5b5 b8b5 c4b5 f6e4 g5h6 g7h6 f3e4 d7c5 e4a8 h6g7 h1g1 c5d3 g1h1 I gave it only some minutes after Rab8 and I get 9 22 10969 13030716 c3b4 e7b4 c4e3 f6h7 g5h4 h7f6 e3c4 b8a8 h4g5 10 13 18142 21125300 c3b4 e7b4 c4e3 f6h7 g5h4 h7f6 e3d5 f6d5 e4d5 e6e8 10 14 29588 34894765 d1d5(wrong fail high) 10 13 33719 39890757 c3b4 e7b4 c4e3 f6h7 g5h4 h7f6 e3d5 f6d5 e4d5 e6e8 11 20 44017 52156703 c3b4 e7b4 c4e3 f6h7 g5h4 g7g8 e3c4 d7b6 c4b6 b8b6 d1d8 c8d8 h4d8 11 20 63032 75541587 c3b4 e7b4 c4e3 f6h7 g5h4 g7g8 e3c4 d7b6 c4b6 b8b6 d1d8 c8d8 h4d8 Uri
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