Author: Joachim Rang
Date: 10:18:45 06/18/04
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On June 18, 2004 at 11:51:51, Dmitri 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 >> >>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 ...) You mean white should put his bishop via c7 on a5 and play golf with king. Nice try, but that won't work ;-). > >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. Indeed Zugzwang comes into play. If I follow your idea: 1. Bg7 Kd3 2. Be5 f3 3. Bc7 Kc3 4. Ke3 Kb3 5. Ba5 The bishop has reached the desired square, but the a-pawn is lost: 5...Kxa3 6. Kd3 Kb3 the white king must retreat: 7. Ke3 Kc4 8. Kf2 Kd4 9. Bc7 Ke4 10. Ba5 Kf5 now white must defend the g-pawn, otherwise black will take it and walk back to the queenside threatening to grasp the white pawn on b4: 11. Bd8 Kf4 another zugzwang, white must leave the d8-a5 diagonal in order to keep the pawn on g5 thus letting black create another passer on the b-file: 12. Be7 a5 13. bxa5 Bc6 14. Bd8 now the black king moves to the b-file to help advancing the pawn, while the black bishop on c6 easily holds off both white passers ;-): 14... Ke4 15. Bf6 b4 16. a6 Kd3 17. Bb2 Kc2 18. Bg7 b3 19. Ke3 b2 20. Bxb2 Kxb2 Game over It feels like being sadistic to play that with black :-))) regards Joachim
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