Author: Vincent Lejeune
Date: 14:17:37 06/20/04
Go up one level in this thread
On June 19, 2004 at 19:09:05, Dieter Buerssner wrote: >On June 18, 2004 at 07:17:04, Joachim Rang wrote: > >>Hi, >> >>Dr John nunn created a Testset containing 10 endgame positions on the boarder >>between draw ans won for one side: >> >>http://www.geocities.com/CapeCanaveral/Launchpad/2640/pgn/tests/NET.zip >> >>The position Nr. 8 is this: >> >>[D]8/8/p4Bp1/1pPb2P1/1P2kp2/P7/5K2/8 w - - 0 1 >> >>Included is the following text: >> >>A fantastic position. An opposite-coloured bishop position with equal pawns >>looks as if it should be a draw, and indeed the players agreed to a draw at >>this point. However, White a serious problems because of his weak a3-pawn, >>which cannot be permanently defended by his bishop. Once this pawn has been >>captured, Black has the chance to make a second passed pawn by playing ...a5, >>which will stretch White's defence to the utmost. Dvoretsky and Yusupov >>subjected this ending to detailed analysis, and came to the astonishing >>conclusion that it is a draw, but only if White starts with the incredible 1 >>c6!!. It is hard to imagine that any machine would find such a move, but who >>knows what might happen in the future... >> >>Anyone analyzed this yet? >> >>some lines I can provide: >> >>Winning: >> >>1.Bf6-g7 Ke4-d3 2.Bg7-e5 f4-f3 3.Be5-g3 Bd5-c6 4.Kf2-f1 Kd3-c3 5.Bg3-e1+ Kc3-b2 >>6.Kf1-f2 Kb2xa3 7.Be1-d2 a6-a5 8.b4xa5 b5-b4 9.Kf2-e3 b4-b3 10.Bd2-c3 b3-b2 >>11.Bc3xb2+ Ka3xb2 12.Ke3-d2 Kb2-b3 13.Kd2-d3 Kb3-b4 14.a5-a6 Kb4xc5 15.a6-a7 >>Bc6-a8 16.Kd3-e3 Kc5-c4 > >How do you continue after 5.Bc7 instead of 5. Be1+? (Idea, witch B on c7, a6-a5 >will not be possible). > >Regards, >Dieter If the white bishop want to avoid a5, the black king go to f5 to force the white bishop to protect the g5 pawn and then push a5! In fact I don't see how white can draw againt this plan : the black king go to eat the a3 pawn then the black go to f5 (to attract the bishop) then black push a5! to make a passed pawn then black go to support the a pawn to win the bishop and the game is won ... may be too simple, but need a refutation ! :o)
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