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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