Author: José de Jesús García Ruvalcaba
Date: 14:42:34 01/05/00
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On January 05, 2000 at 15:55:31, Kolss wrote: >On January 05, 2000 at 14:18:48, José de Jesús García Ruvalcaba wrote: > >>Many years ago I composed the following study: >>8/8/3k3P/b4K2/8/8/8/5N2 w - - 0 1 >> According to my analysis, it is a win for white. My main line was 1. Ne3 Ke7 2. >>Kg6 Kf8 3. Nd5 Kg8 4. h7+ Kh8 5. Ne7 and mate in three more moves (this last >>move was the motiv I was trying to exploit, it is the longest forced mate with >>this material, the black bishop on dark squares the white king in g6, the white >>pawn in h7 and the black king in h8). Unfortunately, 4. Nf6+ Kh8 5. Ne4 is also >>a win for white, for this reason I did not submit this position for publication. >> I do not remember exactly why other first moves do not win, and how does white >>win after 1... Bc3. Could somebody with tablebases please confirm the following? >>-It is a win for white. > >Tablebases say it is +M21. > >>-The only winning move is 1. Ne3 > >Yes, that is true, which means that your study was correct, as far as the key >move is concerned. > >>-The main line I posted is correct. > >However, the best defence is not 1... Ke7, after which 2. Kg6 is +M16 (... Ke6 >[Kf8? 3. Nd5 +M12] 3. Nf5 and 4. Ng7). The main line is as follows: > > 1. Ne3 Bc3 > 2. Kg6 Kd7 > 3. Nd5 Bd4 > 4. Kf7 Bh8 > 5. Nf6+ Kd6 > 6. Nh5 Kd5 > 7. Ng7 Ke5 > 8. Kg8 Kf6 > 9. Kxh8 1-0 > > >> Thanks in advance. > >You are welcome! > >Best regards, > >Munjong. Thank you very much! The seemingly weak moves by black in my analysis are because at that time we were not concerned with delaying mate, but rather trying to prevent the pawn from queening. There are some positions with the white pawn in h7, where black puts its bishop in h8, let the white king capture it and then traps the white king in the corner, resulting in a draw. White must be careful to not advance the pawn prematurely, my friends who falled on these positions were fascinated. José.
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