Author: Slater Wold
Date: 22:02:14 02/12/04
Go up one level in this thread
On February 12, 2004 at 22:17:46, Anthony Cozzie wrote: >On February 12, 2004 at 14:37:30, Roy Eassa wrote: > >>[d] n1QBq1k1/5p1p/5KP1/p7/8/8/8/8 w - - >>1. Bc7!! Qxc8 2. gxf7+ Kh8 3. Be5 Qc5! 4. Bb2!! Nc7 5. Ba1!! a4 6. Bb2 a3 >>7. Ba1 a2 8. Bb2 a1=Q 9. Bxa1 zugzwang! >> >>Besides programs specifically designed to solve mates, does any program find >>this? > >This is another null move killer. > >Black has a queen and a knight but no useful moves apparently after Bxa1. > >Nullmove may be the best thing to happen to computer chess ever, but its not >perfect. > >anthony You sure it's a nullmove problem? Crafty v19.10 White(1): hash 384M hash table memory = 384M bytes. White(1): hashp 100M pawn hash table memory = 96M bytes. White(1): selective -1 -1 null move disabled. White(1): st 9999 search time set to 9999.00. White(1): easy pondering disabled. White(1): setboard n1QBq1k1/5p1p/5KP1/p7/8/8/8/8 w - - White(1): go end-game phase clearing hash tables time surplus 0.00 time limit 166:39 (166:39) depth time score variation (1) 7 0.09 0.01 1. gxh7+ Kh8 2. Qxa8 Qe6+ 3. Kg5 Kxh7 4. Bf6 Qe3+ 5. Kf5 Qe6+ 6. Kg5 7-> 0.16 0.01 1. gxh7+ Kh8 2. Qxa8 Qe6+ 3. Kg5 Kxh7 4. Bf6 Qe3+ 5. Kf5 Qe6+ 6. Kg5 8 0.28 0.01 1. gxh7+ Kh8 2. Qxa8 Qe6+ 3. Kg5 Qe3+ 4. Kf5 Qe6+ 5. Kf4 Kxh7 6. Bxa5 Kg7 7. Qh1 8-> 0.47 0.01 1. gxh7+ Kh8 2. Qxa8 Qe6+ 3. Kg5 Qe3+ 4. Kf5 Qe6+ 5. Kf4 Kxh7 6. Bxa5 Kg7 7. Qh1 9 0.77 0.01 1. gxh7+ Kh8 2. Qxa8 Qe6+ 3. Kg5 Qe3+ 4. Kf5 Qe6+ 5. Kf4 Kxh7 6. Bxa5 Kg7 7. Qh1 f6 9-> 1.84 0.01 1. gxh7+ Kh8 2. Qxa8 Qe6+ 3. Kg5 Qe3+ 4. Kf5 Qe6+ 5. Kf4 Kxh7 6. Bxa5 Kg7 7. Qh1 f6 10 3.50 0.01 1. gxh7+ Kh8 2. Qxa8 Qe6+ 3. Kg5 Qe3+ 4. Kf5 Qe6+ 5. Kf4 Kxh7 6. Bxa5 Kg7 7. Qh1 f6 8. Bb4 10-> 6.55 0.01 1. gxh7+ Kh8 2. Qxa8 Qe6+ 3. Kg5 Qe3+ 4. Kf5 Qe6+ 5. Kf4 Kxh7 6. Bxa5 Kg7 7. Qh1 f6 8. Bb4 11 9.70 0.01 1. gxh7+ Kh8 2. Qxa8 Qe6+ 3. Kg5 Qe3+ 4. Kf5 Qe6+ 5. Kf4 Kxh7 6. Bxa5 Kg7 7. Qh1 f6 8. Bb4 Qe5+ 9. Kg4 11-> 22.80 0.01 1. gxh7+ Kh8 2. Qxa8 Qe6+ 3. Kg5 Qe3+ 4. Kf5 Qe6+ 5. Kf4 Kxh7 6. Bxa5 Kg7 7. Qh1 f6 8. Bb4 Qe5+ 9. Kg4 12 32.72 0.01 1. gxh7+ Kh8 2. Qxa8 Qe6+ 3. Kg5 Qe3+ 4. Kf5 Qe6+ 5. Kf4 Kxh7 6. Bxa5 Kg7 7. Qh1 f6 8. Be1 Kg6 9. Qg2+ Kf7 12-> 1:02 0.01 1. gxh7+ Kh8 2. Qxa8 Qe6+ 3. Kg5 Qe3+ 4. Kf5 Qe6+ 5. Kf4 Kxh7 6. Bxa5 Kg7 7. Qh1 f6 8. Be1 Kg6 9. Qg2+ Kf7 13 1:34 0.01 1. gxh7+ Kh8 2. Qxa8 Qe6+ 3. Kg5 Qe3+ 4. Kf5 Qe6+ 5. Kf4 Kxh7 6. Bxa5 Qh3 7. Qd5 Qf1+ 8. Kg5 Kg7 9. Bc7 f6+ 10. Kh4 Qa1 13-> 3:28 0.01 1. gxh7+ Kh8 2. Qxa8 Qe6+ 3. Kg5 Qe3+ 4. Kf5 Qe6+ 5. Kf4 Kxh7 6. Bxa5 Qh3 7. Qd5 Qf1+ 8. Kg5 Kg7 9. Bc7 f6+ 10. Kh4 Qa1 ? 14 3:30 1/25* 1. gxh7+ White(1): ? time=3:31 cpu=98% mat=-2 n=407569720 fh=94% nps=1.93M ext-> chk=56765486 cap=1513111 pp=25456 1rep=1899598 mate=0 predicted=0 nodes=407569720 evals=127966294 endgame tablebase-> probes=0 hits=0 hashing-> 40%(raw) 35%(depth) -74%(sat) 99%(pawn) hashing-> 0%(exact) 31%(lower) 4%(upper)
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