Author: Thomas McBurney
Date: 19:59:35 06/21/04
Go up one level in this thread
> >My opinion is that -5.5 is too good for black because you get it also for the >following position when white is winning. > > >You should give a smaller bonus for uunstoppable passed pawn in case that the >unstoppable passed pawn is not more advanced than the most advanced enemy pawn. I guess one of the goals of giving a large bonus is so your chess engine would sacrifice pieces to achieve a won pawn end game. Is it worth sacrificing a rook if you know that you are going to queen first? The question is how reliable is your evaluation routine at evaluating these sorts of positions correctly? In my experience so far I have found it to be pretty reliable but I guess one can always tune their evaluation to be better. Of course testing will show if there is a benefit or not. The board position you have shown is good one because it demonstrates a common flaw with people’s implementation of the pawn square rule where the position has complexities that are not easy to detect in evaluation. But then, on the other hand having the pawn square rule can show refutation quicker than it would normally with out it. Kanguruh 1.87 Static eval for Uri's position: +7.46 2 744 29 18 h8g7 d5d6 3 751 29 87 h8g7 f4f5 g6f5 g3f4 4 721 29 212 h8g7 f4f5 4 723 29 368 h8g8! f4f5 5 685 29 682 h8g7? f4f5 5 686 28 1004 h8g7 6 685 27 3597 h8g7 f4f5 g7f6 g3f4 a5a4 f5g6 7 686 23 10911 h8g7 f4f5 g7f7 g3f4 a5a4 f5g6 f7g6 h4h5 g6f6 h5h 6 8 678 5 54756 h8g7 g3g4 a5a4 g4g5 a4a3 f4f5 g6f5 g5f5 a3a2 9 673 25 138406 h8g7 f4f5 g6f5 g3f4 a5a4 f4f5 a4a3 d5d6 g7f7 10 643 67 272131 h8g7 f4f5 11 611 146 549828 h8g7? f4f5 11 -325 1036 3104121 h8g7 d5d6 g7f6 f4f5 g6f5 h4h5 a5a4 d6d7 f6e7 d7d 8 e7d8 h5h6 d8e7 12 -295 1457 5029835 h8g7! d5d6 12 -295 1648 5878122 h8g7 d5d6 13 -265 2625 10803510 h8g7! d5d6 13 -265 3227 13550805 h8g7 d5d6 13 -264 4201 18891963 h8g8! d5d6 13 -265 4622 20945027 h8g8 d5d6 14 -294 5115 23559973 h8g8 d5d6 15 -324 9117 45746847 h8g8 d5d6 Here is Lambchops analysis, as you can see it makes the same inital mistake as Kanguruh. 1 589 0 6 a5a4 2 516 0 60 h8g8 2 557 0 104 h8g7 2 567 0 127 h8g7 d5d6 g7f6 3 522 0 382 h8g7 d5d6 g7f6 d6d7 f6e7 4 561 0 972 h8g7 d5d6 g7f6 d6d7 f6e7 g3f3 5 560 0 2251 h8g7 d5d6 g7f6 d6d7 f6e7 g3f3 a5a4 6 576 0 6268 h8g7 f4f5 g6f5 g3f4 a5a4 f4f5 7 581 0 13695 h8g7 f4f5 g6f5 g3f4 a5a4 f4f5 a4a3 d5d6 g7f7 8 491 0 38391 h8g7 f4f5 g6f5 d5d6 g7f6 h4h5 a5a4 d6d7 f6e7 h5h6 f5f4 g3f4 9 -350 0 134011 h8g7 d5d6 g7f6 f4f5 g6f5 h4h5 a5a4 d6d7 f6e7 h5h6 f5f4 g3f4 e7d7 h6h7 10 -530 0 231090 h8g7 d5d6 g7f6 f4f5 g6f5 h4h5 a5a4 h5h6 a4a3 h6h7 f6g7 d6d7 g7h7 d7d8Q a3a2 11 -546 100 313043 h8g7 d5d6 g7f6 f4f5 g6f5 h4h5 a5a4 d6d7 f6e7 h5h6 e7d7 h6h7 b6b5 g3f4 b5b4 h7h8Q 12 -594 100 430486 h8g7 d5d6 g7f6 f4f5 g6f5 h4h5 b6b5 h5h6 f6e6 h6h7 e6d6 h7h8Q d6d7 g3f3 1 13 -669 100 695769 h8g7 14 -708 200 1154444 h8g7 d5d6 g7f6 f4f5 g6f5 h4h5 f6e6 h5h6 e6d6 h6h7 b6b5 h7h8Q d6c7 g3f4 b5b4 h8d4 c7b7 15 -717 400 2037500 h8g7 d5d6 g7f6 f4f5 g6f5 h4h5 f6e6 h5h6 e6d6 h6h7 b6b5 h7h8Q d6c7 h8e5 c7c6 e5e6 c6c5 e6f5 c5b4 g3f3 a5a4 16 -726 1100 5915377 h8g7 d5d6 g7f6 f4f5 g6f5 h4h5 f6e6 h5h6 e6d6 h6h7 b6b5 h7h8Q d6c5 h8c3 c5b6 c3d4
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