Author: Paulo Soares
Date: 15:35:34 02/07/00
Go up one level in this thread
On February 07, 2000 at 17:49:54, Jeremiah Penery wrote:
>On February 07, 2000 at 15:06:06, Vincent Lejeune wrote:
>
>>3 hard positions, if you want to torture your favourite chessengine for long
>>minutes ...
>>White to play and win!, The keymove is unique for each one.
>>N°1 will cause serious problem for nullmover
>>Solution below ...
>>
>>Good work ! ;)
>>
>>[D] 2k1r3/3q4/8/8/8/8/5RK1/6Q1 w - -
>>[D] 8/8/1P3P2/8/8/8/8/b2nk2K w - -
>>[D] 7Q/3k2p1/6p1/8/1K2Np2/8/8/5q2 w - -
>>
>>[Event "?"]
>>[Site "?"]
>>[Date "????.??.??"]
>>[Round "?"]
>>[White "1"]
>>[Black "?"]
>>[Result "*"]
>>[SetUp "1"]
>>[FEN "2k1r3/3q4/8/8/8/8/5RK1/6Q1 w - - 0 10"]
>>[PlyCount "21"]
>>
>>10. Rc2+ Kb8 11. Rb2+ Ka8 12. Qa1+ Qa7 13. Qh1 $3 Rb8 14. Kh2+ Rb7 15. Qd5 Qb8+
>>16. Kg2 Qc7
>
>Qc7 is bad. I don't see how white can win after Qc8.
7....Qc8 loses to 8. Ra2+
1. Rc2+ Kb8 2. Rb2+ Ka8 3. Qa1+ Qa7 4. Qh1 Rb8 5. Kh2+ Rb7
6. Qd5 Qb8+ 7. Kg2 Qc7 (7... Qc8 8. Ra2+ Kb8 9. Qe5+ Rc7 (9... Qc7 10. Qe8+ Qc8
11. Ra8+ {+-}) 10. Kh2 Qb7 11. Rb2 Qxb2+ 12. Qxb2+ {+-}) 8. Ra2+ Kb8 9. Qg8+
Qc8 10. Ra8+ Kxa8 11. Qxc8+ *
Paulo Soares, from Brazil
>>17. Ra2+ Kb8 18. Qg8+ Qc8 19. Ra8+ Kxa8 20. Qxc8+ *
>>
>>[Event "?"]
>>[Site "?"]
>>[Date "????.??.??"]
>>[Round "?"]
>>[White "2"]
>>[Black "?"]
>>[Result "*"]
>>[SetUp "1"]
>>[FEN "8/8/1P3P2/8/8/8/8/b2nk2K w - - 0 1"]
>>[PlyCount "10"]
>>
>>1. f7 Kf1 2. Kh2 Nf2 3. Kg3 Ne4+ 4. Kf4 Nc5 5. b7 Nd7 *
>>
>>
>>[Event "?"]
>>[Site "?"]
>>[Date "????.??.??"]
>>[Round "?"]
>>[White "3"]
>>[Black "?"]
>>[Result "*"]
>>[SetUp "1"]
>>[FEN "7Q/3k2p1/6p1/8/1K2Np2/8/8/5q2 w - - 0 1"]
>>[PlyCount "35"]
>>
>>1. Nc5+ Kd6 2. Qb8+ Kd5 3. Qg8+ Kd4 4. Qe6 Qh1 5. Qd6+ Ke3 6. Qe5+ Kf2 7. Nd3+
>>Kg2 8. Nxf4+ Kg3 9. Qg5+ Kf2 10. Qc5+ Kg3 11. Ne2+ Kg4 12. Qd4+ Kh3 13. Qe3+
>
>White is winning anyway, but the last two moves are not optimal for black. 12.
>...Kh5 is much better than Kh3.
>
>>Kg2 14. Nf4+ Kf1 15. Qe2+ Kg1 16. Qe1+ Kh2 17. Qf2+ Qg2 18. Qxg2# *
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