Author: Sune Larsson
Date: 19:29:16 04/24/02
Go up one level in this thread
On April 24, 2002 at 18:38:16, Oliver Roese wrote: >On April 24, 2002 at 17:00:09, Sune Larsson wrote: > >>On April 24, 2002 at 15:46:11, Oliver Roese wrote: >> >>>Hi! >>> >>>On April 24, 2002 at 13:34:21, Sune Larsson wrote: >>> >>>> >>>> [D]8/2b1Bp1k/2p3pP/4P1P1/2P1K3/8/8/8 w - - 0 52 >>>> >>>> Every program I've tried so far seems to think that this position >>>> is won for white. There are evals of more than +3.00. White is a pawn >>>> up but it's a dead draw. >>>> >>>> White's king has three doorways to heaven, a5, c5 and e5. >>>> But black's bishop is closing everyone of them: >>>> >>>> 1) The white king moves to a4 and tries to enter via a5. >>>> Black keeps the bishop on c7 and shuffles the king. >>>> >>>> 2) The white king moves to b4 or d4 and tries to enter via c5. >>>> Black puts the bishop on b6. >>>> >>>I am sorry to oppose but here is the weak point. Lets assume this position would >>>arise: >>>[D]6k1/5p2/1bp2BpP/4P1P1/1KP5/8/8/8 w - - 0 1 >>>White breaks through and gives his pawn e5 for pawn c6. Two passers >>>are enough to win, e.g:: >>>1.Be7 Kh7 2.Bc5 Bd8 3.Be3 Bc7 4.Kc5 Bxe5 5.Kxc6 and white wins easily. >>> >>>Oliver Roese >> >> >> >> [D]6k1/5p2/1bp2BpP/4P1P1/2P5/1K6/8/8 b - - 0 1 >> >> >> Before the white king reaches b4, black must play 1.-Ba5! keeping >> the resource 2.-Bd2! = >> >> Sune > >You are right, that's it. >I couldn't find another idea to win, so it seems this position is a draw. >Pretty amazing, i think. >Where does this position come from? >Oliver The original test position was from a game of mine vs Fritz 7 (game 120 min), which was previously posted here. Fritz (white) misplayed the ending to reach the position on top of this post. The game was drawn. Sune > > >>> >>> >>>> 3) All the time black prevents the possibility 1.e6 fxe6 2.Ke5 >>>> by keeping the bishop on c7. >>>> >>>> 4) If white plays his bishop to f4, threatening 1.e6 black plays >>>> 1.-Bb6. Then 2.e6 fxe6 3.Ke5 is met by Bc7+ >>>> >>>> 5) And black has a million of Kg8-h7 moves while white cannot make >>>> any progress at all. 1.Bd6 Bd8 is nothing. All c5 moves from white >>>> are just voluntarily closing one possible path for the king. >>>>
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