Author: Dieter Buerssner
Date: 14:36:37 11/15/05
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On November 15, 2005 at 07:55:38, Bernhard Bauer wrote: >On November 14, 2005 at 11:25:28, Vincent Lejeune wrote: > >>[d]6k1/1p1r1pp1/3p3p/NP1Pp1n1/P3P2n/8/5K1P/4RB2 w - - 0 34 >> >>Nxb7! >> >>[Event "?"] >>[Site "?"] >>[Date "2005.11.06"] >>[Round "3.8"] >>[White "x"] >>[Black "y"] >>[Result "*"] >>[SetUp "1"] >>[FEN "6k1/1p1r1pp1/3p3p/NP1Pp1n1/P3P2n/8/5K1P/4RB2 w - - 0 34"] >>[PlyCount "13"] >> >>34. Nxb7 Rxb7 35. a5 Rc7 36. b6 Rc2+ 37. Re2 Nxe4+ 38. Kg1 Nf3+ 39. Kh1 Rc1 40. >>Rxe4 * > >Thank you for posting this position. >For a human it is easy to see that the white a and b pawns are strong. So I >changed the PastPawn parameter in Gambitfruit from 100 to 150. >Nxb7 is found in 8 sec, however the engine switches to Nc6, which may be a good >move too. Changing the the PastPawn parameter to a greater value will result in >finding Nxb7 very early and give a good score too. I suspect, that Gambitfruit changed in this manner will not be able to win this position (with not too much time against good defence). A couple of years ago, I made a similar change to Yace for one test position, where an outside passed pawn would win the game. Yace had no problem to find the correct move, and create that passed pawn. But it behaved very emberrassing. To win, that passed pawn had to be given up later. But because of the high bonus, Yace wanted to keep it ... >[D]8/pR4pk/1b6/2p5/N1p5/8/PP1r2PP/6K1/ b I had tested this position rather often (the position was also discussed here now and then). Some years ago, it seemed very difficult. I guess, with modern hardware, many engines will solve it convincingly in short time. Regards, Dieter
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