Author: Dieter Buerssner
Date: 12:53:35 03/18/01
Go up one level in this thread
On March 18, 2001 at 04:12:41, Uri Blass wrote:
>>>>> 8/8/pq1PQ1kp/6p1/8/7P/5PK1/8 b - -
>Crafty18.03 under chessbase(64 mbytes hash) cannot reproduce it.
I tried yet again, and I can reproduce the lines I had posted.
>The score of it is 7.47 at depth 12 but 7.79 at depth 13 when the main line is
>1...Kg7 2.Qd7+ at depth>=13
>The difference between depthes 11 and 12 is 0.4 pawns and not 0.39 pawns.
>
>At depth 14 the score is +8.02 and it finished depth 14 in a few minutes on
>pIII800 that is clearly less than your 20 minutes.
I tested with 12M hash and 5M hashp. Perhaps because of the bigger transposition
tables you used, you got even higer speedup, than the hardware difference would
suggest. When I retried with slightly bigger hash, I have seen the next output
after 13:46.
Ok, once again, this time with 24M hash, 5M hashp, TBs disabled (to make it
easier reproducable):
Crafty v18.6
[...]
Black(1): st 100000
search time set to 100000.00.
Black(1): go
end-game phase
time surplus 0.00 time limit 1666:40 (1666:40)
nss depth time score variation (1)
[...]
7-> 0.95 8.30 1. ... Kg7 2. Qe7+ Kg6 3. Qc7 Qb3 4.
d7 g4 5. Qd6+ Kg7 6. d8=Q Qxh3+
8 1.45 8.05 1. ... Kg7 2. Qe7+ Kg6 3. Qc7 Qb1 4.
d7 Qe4+ 5. Kh2 Qd4 6. d8=Q Qxf2+ 7.
Kh1 Kf5 <HT>
8-> 1.48 8.05 1. ... Kg7 2. Qe7+ Kg6 3. Qc7 Qb1 4.
d7 Qe4+ 5. Kh2 Qd4 6. d8=Q Qxf2+ 7.
Kh1 Kf5 <HT>
9 2.23 ++ 1. ... Kg7!!
9-> 3.90 7.66 1. ... Kg7 2. Qe7+ Kg6 3. Qc7 Qb1 4.
d7 Qe4+ 5. Kh2 Qd4 6. d8=Q Qxf2+ 7.
Kh1 Kf5 8. Qf8+ <HT>
10 5.78 ++ 1. ... Kg7!!
10-> 10.99 7.27 1. ... Kg7 2. Qe7+ Kg6 3. Qc7 Qb1 4.
d7 Qe4+ 5. Kh2 Qd4 6. d8=Q Qxf2+ 7.
Kh1 Kf5 8. Qf8+ <HT>
11 14.45 7.61 1. ... Kg7 2. Qe7+ Kg6 3. Qc7 Qb1 4.
d7 Qe4+ 5. Kh2 Qd4 6. Kg1 g4 7. d8=Q
Qxd8 8. Qxd8 gxh3
11-> 14.68 7.61 1. ... Kg7 2. Qe7+ Kg6 3. Qc7 Qb1 4.
d7 Qe4+ 5. Kh2 Qd4 6. Kg1 g4 7. d8=Q
Qxd8 8. Qxd8 gxh3
12 45.33 ++ 1. ... Kg7!!
12-> 1:15 7.22 1. ... Kg7 2. Qe7+ Kg6 3. Qc7 Qb1 4.
d7 Qe4+ 5. Kh2 Qd4 6. Kg1 g4 7. d8=Q
Qxd8 8. Qxd8 gxh3
13 2:35 ++ 1. ... Kg7!!
13-> 3:56 6.83 1. ... Kg7 2. Qe7+ Kg6 3. Qc7 Qb1 4.
d7 Qe4+ 5. Kh2 Qd4 6. Kg1 g4 7. d8=Q
Qxd8 8. Qxd8 gxh3
14 13:46 -- 1. ... Kg7
14 19:18 7.90 1. ... Kg7 2. Qd7+ Kg6 3. h4 g4 4.
Qxg4+ Kf6 5. Qf4+ Ke6 6. Qxh6+ Kd5
7. Qh5+ Kxd6 8. Qh6+ Kc5 9. Qxb6+ Kxb6
10. h5 a5 11. h6 a4
14-> 19:20 7.90 1. ... Kg7 2. Qd7+ Kg6 3. h4 g4 4.
Qxg4+ Kf6 5. Qf4+ Ke6 6. Qxh6+ Kd5
7. Qh5+ Kxd6 8. Qh6+ Kc5 9. Qxb6+ Kxb6
10. h5 a5 11. h6 a4
Black(0): ?
time=22:39 cpu=99% mat=0 n=241885205 fh=88% nps=177905
ext-> chk=29059370 pp=1117756 1rep=1452948 mate=44333
predicted=0 nodes=241885205 evals=16868856
endgame tablebase-> probes done=0 successful=0
hashing-> trans/ref=42% pawn=8% used=99%
Can anybody can reproduce this? Otherwise, it would mean, that I have set up
something totally wrong, which certainly would interest me.
>I can add that Qe7+ is also an easy win for white when the best line includes a
>repetition
>1.Qe7+ Kg6 2.Qe6+ Kg7 3.Qd7+
Sure. But I think, it is quite unlikely, that a chess engine will show a main
line starting like this.
Regards,
Dieter
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