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Subject: Re: If you like to solve easy forced mate...

Author: Gian-Carlo Pascutto

Date: 07:00:17 01/24/01

Go up one level in this thread


On January 24, 2001 at 09:07:30, leonid wrote:


>Please indicate your result.

Selective search:

Sjeng: prove

Max time to search (s): 240

P: 0 D: 100000000 N: 380445 S: 380444 Mem: 10.16M Iters: 6888 MaxDepth: 23
Time : 160.620000
This position is WON.
PV: b3d2 e2d2 d7b5 e1e2 b5e2 f1e1 d4c2

Brute force:

Sjeng: go
Middlegame phase.
 2    1898    47      190  Bxg2+ Rxg2 Nxf2
 2    1898    74     1642  Bxg2+ Rxg2 Nxf2
 3    1955    76     1666  Bxg2+ !!
 3    1955   219    27660  Bxg2+ <Rxg2> <Nxf2> <bxa6>
 3    1955   291    38762  Bxg2+ <Rxg2> <Nxf2> <bxa6>
 4    1916   710   128043  Bxg2+ Rxg2 Nxf2 Rxg5 Nxe2 Nxd7 Rxd5
 4    1916  1723   321316  Bxg2+ Rxg2 Nxf2 Rxg5 Nxe2 Nxd7 Rxd5
 5    1866  3352   662426  Bxg2+ ??
 5    1867  8918  1717626  Nd2+ !
 5    1966  9328  1771839  Nd2+ !!
 5    1966 10234  1873728  Nd2+ <Rxd2>

No mate score at ply 5 and I didn't want to wait for ply 6. Finds
the correct move faster than selective search though.

>If you have somewhere forced mate position from real championship and that is
>above 6 moves deep, please put it here. Best will be well populated, with many
>pieces. This is actually what I wanted to do today but was not able to find
>suitable one. All the time some short mates in 3 and 4. It will be curious to
>see how actual chess program perform in real forced mate situation.

From one of my own games: Bd1 mates, I played Bf5+ and went on to lose.

[D}8/pp3K1k/2p2R2/4r1p1/6B1/2P4p/PP6/8 w - - 0 1

The following are off Dan's ftp site, dunno what file. Sjeng
doesn't see the mates in a minute time with brute-force search
(it does see most moves) on my machine. I suspect most other
programs will have little problems with them.

1k1r4/1bp2pp1/5q2/p4p2/P2P1P2/1Q2r1Pp/8/1R4K1 b - - 0 1
1q1r4/rb1k4/pp4P1/4Q3/2PP4/8/PB4PP/4R1K1 w - - 0 1
1r3rk1/p5pp/2pbp3/3p4/3P4/1N3PnP/P1P2qPK/R1BQR3 b - - 0 1
1r5r/5pk1/3p1qp1/ppnPp1N1/4P1b1/4R3/PP1NBPK1/2RQ4 b - - 0 1
2b2r1k/4q2p/3p2pQ/2pBp3/8/6P1/1PP2P1P/R5K1 w - - 0 1
2b3k1/4rrpp/p2p4/2pP2RQ/1pP1Pp1N/1P3P1P/1q6/6RK w - - 0 1

--
GCP



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