Author: Bernhard Bauer
Date: 00:37:47 11/10/99
Go up one level in this thread
On November 09, 1999 at 17:17:06, James Robertson wrote:
>Today Kiriakov swept Tiviakov away with a cool sacrifice. I haven't tried my
>program on the position yet, but a little analysis with Crafty convinced me
>Insomniac would never find the move in my lifetime.
>
>rn1r2k1/1bqpbppp/pp2pn2/6N1/2P5/1PN1P3/PBQ1BPPP/3R1RK1 w - - bm Nd5;id Kiriakov
>- Tiviakov, 1999;
>
>How do other programs do? If it doesn't seem to hard, maybe I'll try my program
>on it. :)
>
>James
I gave this position to crafty and did a search Nd5. Here are the results for
crafty16.19 and crafty17.0.
Crafty16.19
===========
12-> 11.30 -0.07 1. Nd5 exd5 2. Bxf6 Bxf6 3. Qxh7+ Kf8
4. cxd5 d6 5. Bh5 Rc8 6. Nxf7 Nd7 7.
Ng5 Qc2 8. Ne6+ Ke7 9. Rd3 Qxa2 10.
Nxg7
13 27.83 0.13 1. Nd5 exd5 2. Bxf6 Bxf6 3. Qxh7+ Kf8
4. cxd5 d6 5. Bh5 Rc8 6. Nxf7 a5 7.
Qf5 Ba6 8. Rc1 Qxc1 9. Rxc1 Rxc1+
13-> 27.83 0.13 1. Nd5 exd5 2. Bxf6 Bxf6 3. Qxh7+ Kf8
4. cxd5 d6 5. Bh5 Rc8 6. Nxf7 a5 7.
Qf5 Ba6 8. Rc1 Qxc1 9. Rxc1 Rxc1+
14 44.83 ++ 1. Nd5!!
14-> 1:18 0.52 1. Nd5 exd5 2. Bxf6 Bxf6 3. Qxh7+ Kf8
4. cxd5 d6 5. Bh5 Rc8 6. Nxf7 a5 7.
Qf5 Ba6 8. Rc1 Qxc1 9. Rxc1 Rxc1+
15 2:12 ++ 1. Nd5!!
15-> 8:59 0.91 1. Nd5 exd5 2. Bxf6 Bxf6 3. Qxh7+ Kf8
4. cxd5 d6 5. Bh5 Rc8 6. Nxf7 a5 7.
Qf5 Ba6 8. Rc1 Qxc1 9. Rxc1 Rxc1+
time=15:00 cpu=199% mat=0 n=476806687 fh=96% nps=529508
ext-> checks=46001900 recaps=737487 pawns=154520 1rep=5107499 thrt:139967
predicted=0 nodes=476806687 evals=31020644
endgame tablebase-> probes done=0 successful=0
SMP-> split=1274 stop=164 data=10/64 cpu=29:59 elap=15:00
and
crafty17.0
==========
12-> 15.23 -0.67 1. Nd5 exd5 2. Bxf6 Bxf6 3. Qxh7+ Kf8
4. cxd5 d6 5. Bh5 Rc8 6. Nxf7 Nd7 7.
Ng5 Qc2 8. Ne6+ Ke7 9. Rd3 Qxa2 10.
Nxg7
13 30.92 -0.60 1. Nd5 exd5 2. Bxf6 Bxf6 3. Qxh7+ Kf8
4. cxd5 d6 5. Bh5 Rc8 6. Nxf7 a5 7.
Bg6 Qc5 8. e4 Nd7
13-> 30.92 -0.60 1. Nd5 exd5 2. Bxf6 Bxf6 3. Qxh7+ Kf8
4. cxd5 d6 5. Bh5 Rc8 6. Nxf7 a5 7.
Bg6 Qc5 8. e4 Nd7
14 46.22 ++ 1. Nd5!!
14-> 1:35 -0.21 1. Nd5 exd5 2. Bxf6 Bxf6 3. Qxh7+ Kf8
4. cxd5 d6 5. Bh5 Rc8 6. Nxf7 a5 7.
Bg6 Qc5 8. e4 Nd7
15 3:43 0.00 1. Nd5 exd5 2. Bxf6 Bxf6 3. Qxh7+ Kf8
4. cxd5 d6 5. Bh5 Ke7 6. Nxf7 Rc8 7.
Qf5 Kf8 8. Qf4 Ke7 9. Qf5
15-> 3:43 0.00 1. Nd5 exd5 2. Bxf6 Bxf6 3. Qxh7+ Kf8
4. cxd5 d6 5. Bh5 Ke7 6. Nxf7 Rc8 7.
Qf5 Kf8 8. Qf4 Ke7 9. Qf5
16 10:51 0.00 1. Nd5 exd5 2. Bxf6 Bxf6 3. Qxh7+ Kf8
4. cxd5 d6 5. Bh5 Bxg5 6. Qh8+ Ke7
7. Qxg7 Rf8 8. Qxg5+ Ke8 9. Rc1 Qd8
10. Qf5 Nd7 11. a3 Qf6
16-> 10:51 0.00 1. Nd5 exd5 2. Bxf6 Bxf6 3. Qxh7+ Kf8
4. cxd5 d6 5. Bh5 Bxg5 6. Qh8+ Ke7
7. Qxg7 Rf8 8. Qxg5+ Ke8 9. Rc1 Qd8
10. Qf5 Nd7 11. a3 Qf6
time=15:00 cpu=200% mat=0 n=314623673 fh=93% nps=349445
ext-> checks=16736788 recaps=643735 pawns=162104 1rep=1411877 thrt:97472
predicted=0 nodes=314623673 evals=206046602
endgame tablebase-> probes done=0 successful=0
hashing-> trans/ref=23% pawn=2% used=99%
SMP-> split=1349 stop=171 data=10/64 cpu=30:01 elap=15:00
Comparing these results show:
Crafty16.19 Crafty17.0
score(15) 0.91 0.0
nps 529508 349445
So for this position crafty16.19 looks much better than crafty17.0.
Crafty17.0 is 34% slower than crafty16.19, not to mention the evaluation.
BTW computation was done on a 2xPIII 450MHz computer running WinNT4.0.
Kind regards
Bernhard
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