Author: Dmitri
Date: 08:51:51 06/18/04
Go up one level in this thread
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 > >Drawing (?): > >1.c6 Bxc6 2.Ke2 f3+ 3.Kd2 Kf4 4.Bd4 Kxg5 5.Ke3 Kf5 6.Bc5 g5 7.Bd6 g4 8.Bg3 Bd5 >9.Kd4 Bb7 10.Ke3 Kf6 11.Kf4 Bc8 12.Bh4+ Kf7 13.Bf2 Ke7 14.Ke5 Kd8 15.Kd6 Bf5 >16.Ke5 Bd7 17.Kd6 > >Thank you in advance for any analysis. > >regards Joachim Hi, In the above line i think the mistake is to keep the bishop on the white half of the board. After the correct 2.Bg7-e5 forcing f3 black should put his bishop on a5 via c7 (Be5-c7-a5) and play golf with king (e3-f2-e3-f2 ...) Then if by some miracle of zugz-magic black wins g5 white puts his king on g3 and bishop on c7. I think it is a simple draw.
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