Author: Jeremiah Penery
Date: 02:25:57 04/27/99
Go up one level in this thread
On April 27, 1999 at 04:09:08, Harald Faber wrote: >On April 26, 1999 at 23:48:50, Igor Syry wrote: > >>Hoped you enjoyed the problem... >>Igor > >Yes, I did. I also enjoyed this problem: > >qnb5/1p1kBK2/pPp5/P1p5/2P5/8/8/8 b - - 0 0 > >White to move and win. It SHOULD be an easy one, only move#2 and the motive must >be found. >What amazes me is that Crafty and Fritz5.32 with their deepest search depth >don't find the final winning move in move#19 pv. They have only a draw eval so >it must be the best move because the material is way down, or are there other >reasons? It is 19.Be5 which is found by them with 0.00, just facing that move. >If you make 19.(winning move) SUDDENLY they realize the win but not 19.Be5 up to >depth 60! I followed the line you gave below, and it looks like the problem is that Crafty seems to really want to take the draw by repetition (for both sides)...I set the drawscore to -9.99 and it still had some trouble, but it did much better. Like Uri said in his post, it could be a null-move problem as well. >OK, I add the line much below, if you don't want to see it, you won't... > > 1n2b3/qpP5/p1pk3p/PPp2K2/2P5/8/8/6B1 w - - 0 1 > >1. b6 Qa8 2. c8=Q Bd7+ 3. Kf6 Bxc8 4. Bh2+ Kd7 5. Kf7 Kd8 6. Bc7+ Kd7 7. Be5 >Kd8 8. Bf6+ Kd7 9. Be7 h5 10. Bg5 Kd6 11. Bf4+ Kd7 12. Bg3 Kd8 13. Bh4+ Kd7 14. >Be7 h4 15. Bxh4 Kd6 16. Bg3+ Kd7 17. Be5 Kd8 18. Bf6+ Kd7 19. Be7 1-0
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