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Subject: Re: Does any "regular" chess program see White's win?

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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