Author: leonid
Date: 15:43:14 10/08/01
Go up one level in this thread
On October 07, 2001 at 13:46:06, Heiner Marxen wrote:
>On September 30, 2001 at 05:43:43, Tim Foden wrote:
>
>>On September 29, 2001 at 07:33:59, leonid wrote:
>>
>>>Hello!
>>>
>>>This mate is probably very easy. There are good chance that you will solve it
>>>even by brute force wihtout too much waiting.
>>
>>As other post pointed out, I'm afraid this one isn't as easy as you thought :)
>
>Yes. Chest agrees with you :-)
>
>
>>>[D]RQ2rqbb/4p2k/1KQQqQ1n/1R2qqpq/1P3P2/1BBPNN2/nq6/rq4QQ w - -
>>>
>>>Please indicate your result.
>>
>>GLC215-pr9, 920MHz Duron, 96MB hash claims Nxg5+ is a mate in 11, after 10m 3s.
>>
>>Cheers, Tim.
>
>Chest on K7/600 with 350 MB hash needs 3.6 days (!) to be sure about it.
>1.Nxg5+ is the only key move for mate in 11. Interestingly, Chest gives
>the exact same PV as GLC below.
>To prove that there is no mate in 10 Chest needs more than 12 hours, already.
>
>I wonder how Leonid did this one with "brute force search". Leonid?
Hi, Heiner!
I went on this position only 10 moves deep. Since mine found mate in 11, I was
sure that it is mate in 11. Probably will put this position by brute force at
night 11 moves deep.
I expected that some programs with more hash and quiker computer will solve more
rapidly that mine. This situation I was able to see repeatedly with your
program. Sometime I feel that I must to come back to my code and do something.
Brute force search:
Depth (moves) Time Branching factor nodes/second
4 moves 0.93 sec 77k (killo nodes/one sec)
4.0
5 moves 3.73 sec 72k
3.94
6 moves 14.72 sec 59k
4.29
7 moves 63 sec 65k
4.06
8 moves 4 min 16 sec 74k
5.8
9 moves 24 min 54 sec 78k
5.5
10 moves 2 h 18 min 27 sec 88k
Celeron 600Mhz.
Enjoyed very much your program!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Really very, very impressive!
Cheers,
Leonid.
>Cheers,
>Heiner
>
>
>>~~~~~~~~~
>>
>>Analysis:
>>
>> Game stage: Opening
>> Current eval: -8.66
>> Ply Time Score Nodes Principal Variation
>> 2 0.10 -- 8234 Nxe5 (a=-3.07 b=-2.27 e=-3.07)
>> 2 0.10 -8.452 8881 Nxe5 exd6 Nxf5 Rxb8+
>> 2 0.11 -5.851 11356 Nxg5+ Qhxg5 Qdxe5 Rxb8+ Rxb8 Bxf6 Nxf5
>> 2 0.12 ++ 12757 Qxf5+ (a=-321.00 b=-3.07 e=-3.07)
>> 2 0.13 -2.951 15129 Qxf5+ Qfxf5 Qxh5 Rxb8+ Rxb8
>> 2 0.17 -2.951 17202 Qxf5+ Qfxf5 Qxh5 Rxb8+ Rxb8
>> 3 0.34 -- 68575 Qxf5+ (a=-3.35 b=-2.55 e=-3.35)
>> 3 0.39 -3.493 86623 Qxf5+ Qe6xf5 Bxg8+ Kxg8 Qc4+ Qhf7 fxe5 Rxb8+ Qxb8
>> 3 0.52 -3.493 127462 Qxf5+ Qe6xf5 Bxg8+ Kxg8 Qc4+ Qhf7 fxe5 Rxb8+ Qxb8
>> 4 1.78 -- 600582 Qxf5+ (a=-3.89 b=-3.09 e=-3.89)
>> 4 1.85 -6.535 635792 Qxf5+ Qe5xf5 Bxe6 Rxb8+ Qxb8 Qxb8+ Rxb8 Qxh1 Bxb2
>> Qhxg1 Bxf5+ Nxf5
>> 4 2.38 -5.579 870797 fxe5 Qexf6 Bxg8+ Qxg8 Nxg5+ Qhxg5 exf6 Rxb8+ Rxb8
>> 4 2.71 -5.150 995427 Rxe5 Rxb8+ Qxb8 Qxb8+ Rxb8 Qfxf6 Rxe6 Qxh1 Bxb2
>> Qfxb2 Rxe7+
>> 4 2.82 -5.150 1019242 Rxe5 Rxb8+ Qxb8 Qxb8+ Rxb8 Qfxf6 Rxe6 Qxh1 Bxb2
>> Qfxb2 Rxe7+
>> 5 3.28 ++ 1173106 Rxe5 (a=-5.55 b=-4.75 e=-4.75)
>> 5 4.29 -3.391 1523440 Rxe5 Bxf6 Qxh5 Rxb8+ Rxb8 Qxd6 Rxf8 Qxc3 Nxf5
>> Qdxc6+ Qxh6#
>> 5 10.33 -3.391 3920728 Rxe5 Bxf6 Qxh5 Rxb8+ Rxb8 Qxd6 Rxf8 Qxc3 Nxf5
>> Qdxc6+ Qxh6#
>> 6 12.62 -3.676 4780613 Rxe5 Qf5xf6 Rxe6 Rxb8+ Rxb8 Qxh1 Rxf6 Qhxg1 Nxg1
>> Nxc3 Rxh6+
>> 6 29.17 -3.492 11526k Qxf5+ Qfxf5 Bxe5 Rxb8+ Rxb8 exd6 Qxh5 Qxg1 Nxg1
>> 6 39.50 -3.492 15950k Qxf5+ Qfxf5 Bxe5 Rxb8+ Rxb8 exd6 Qxh5 Qxg1 Nxg1
>> 7 41.31 ++ 16725k Qxf5+ (a=-3.89 b=-3.09 e=-3.09)
>> 7 53.29 -1.842 21636k Qxf5+ Qfxf5 Rxe5 Rxb8+ Rxb8 Qxg1 Qxh5 Qxe3+ Rxe3
>> Qxd6 Bxb2 Qxb8+
>> 7 3:28 -1.842 84447k Qxf5+ Qfxf5 Rxe5 Rxb8+ Rxb8 Qxg1 Qxh5 Qxe3+ Rxe3
>> Qxd6 Bxb2 Qxb8+
>> 8 3:37 ++ 88033k Qxf5+ (a=-2.24 b=-1.44 e=-1.44)
>> 8 5:22 +1.024 131812k Qxf5+ Qfxf5 Rxe5 Rxb8+ Rxb8 Qxc3 Qxe7+ Qff7 Qcxe6
>> Qxe5 fxe5 Qxh1 Q6xf7+ Bxf7 Nxg5+
>> 8 10:03 +Mate11 252324k Nxg5+ Qfxg5 Qce4+ Nf5 Qxh5+ Qxh5 Qexf5+ Qhxf5 Qh4+
>> Qh5 Qxh5+ Qxh5 Rxh5+ Qfh6 Rxh6+ Kxh6 Qg5+ Kh7
>> Qh5+ Qh6 Qhxh6#
>> 8 11:16 +Mate11 305358k Nxg5+ Qfxg5 Qce4+ Nf5 Qxh5+ Qxh5 Qexf5+ Qhxf5 Qh4+
>> Qh5 Qxh5+ Qxh5 Rxh5+ Qfh6 Rxh6+ Kxh6 Qg5+ Kh7
>> Qh5+ Qh6 Qhxh6#
>> 9 15:56 +Mate11 535047k Nxg5+ Qfxg5 Qce4+ Nf5 Qxh5+ Qxh5 Qexf5+ Qhxf5 Qh4+
>> Qh5 Qxh5+ Qxh5 Rxh5+ Qfh6 Rxh6+ Kxh6 Qg5+ Kh7
>> Qh5+ Qh6 Qhxh6#
>> 9 24:34 +Mate11 947530k Nxg5+ Qfxg5 Qce4+ Nf5 Qxh5+ Qxh5 Qexf5+ Qhxf5 Qh4+
>> Qh5 Qxh5+ Qxh5 Rxh5+ Qfh6 Rxh6+ Kxh6 Qg5+ Kh7
>> Qh5+ Qh6 Qhxh6#
>> 10 26:35 0/96 Nxg5+ >exit
>> local: t=26:45 nps=658130.5 n=1056311358 (13.8% / 86.2%) fh=94.6%
>> total: t=26:45 nps=658130.5 n=1056311358 draws=208762
>> trans: probes=108078258 hits=10516687 (9.73%) draft=7001585 (6.48%)
>> tcuts: exact=181 (0.00%) upper=4575419 (4.23%) lower=1340368 (1.24%)
>> tstor: exact=685 (0.00%) upper=60278146 (76.19%) lower=18837836 (23.81%)
>> ext: check=100911703 recap=4731596 ppush=107552 1rep=3515341 thrt=0
>> q-moves: gen=930595119 tested=174168516 made/un=97691166 max-dep=10
>> max eval diff: part-1=2.176 part-2=2.776
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