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Subject: Re: Mate in 12

Author: Stuart Cracraft

Date: 14:22:10 02/13/06

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On February 12, 2006 at 10:34:47, Rob Basham wrote:

>[D]2r4k/1R3Q2/5b2/1P2pq2/6b1/4B2N/5PPK/8 w - - 0 1
>
>Bg5 seems to mate in about 12 moves.
>Any engines announce a mate at move one?
>
>regards
>
>Rob

My program has the feature of adjusting the score by the ply
on retrieve/store of hash entries. Despite that, it cannot
figure out that this is a mate which would be indicated by
the presence of an "M" next to the move on the iteration.

Interrupt current ply and return move at timeout
Testsuite: Tests/tests.epd 1 positions
*** Problem   Solution(s): Bg5 (bm)
-- ** BR ** -- ** -- BK
** WR ** -- ** WQ ** --
-- ** -- ** -- BB -- **
** WP ** -- BP BQ ** --
-- ** -- ** -- ** BB **
** -- ** -- WB -- ** WN
-- ** -- ** -- WP WP WK
** -- ** -- ** -- ** --
mv 1 stage 0, white to move, computer plays white
hash=a5e05373307344c6
0 0 0 0 0 0
Alpha=1842 Beta=2643 Maxdepth=9999999 MaxTime=99999900 xboard=0
Itr/Max Mv   Score   Time Nodes PV
 1/ 6  f7d5 2144  0.00      197 f7d5
 2/ 6  e3h6 2141  0.01      581 e3h6
 3/ 9  e3h6 1942  0.02     1981 e3h6 c8c3
 4/ 9  e3h6 2260  0.05     4545 e3h6 c8g8 f7c4
 5/13> h3g5 2660  0.15    14670 h3g5 g4e2 f7h7 f5h7 b7h7 h8g8 b5b6
 5/14  e3g5 5179  0.21    19764 e3g5 f6e7 f7f5 g4f5 b7e7
 6/14> e3g5 5579  0.24    22138 e3g5 f6e7 f7f5 g4f5 b7e7 c8c5
 6/15  e3g5 5579  0.35    34550 e3g5 f6e7 f7e7 g4h3
 7/16> e3g5 5979  0.39    37442 e3g5 f6e7 f7e7 f5g5 h3g5 c8c5 b5b6
 7/17  e3g5 6639  0.60    61690 e3g5 f6e7 f7e7 f5g6 e7f6 g6f6
 8/20> e3g5 7039  0.71    71218 e3g5 f6e7 f7e7 f5g6 e7f6 g6f6 b5b6 g4h3 g5f6
h8g8
 8/20  e3g5 8676  1.15   124092 e3g5 f6e7 f7e7 f5g6 e7f6 g6f6 g5f6 h8g8 b7g7
g8f8 g7g4
 9/22  e3g5 8606  2.17   243604 e3g5 f6e7 f7e7 f5g6 e7f6 g6f6 g5f6 h8g8 b7g7
g8f8 g7g4 c8c5 b5b6
10/23> e3g5 9006  2.90   313022 e3g5 f6e7 f7e7 f5g6 e7f6 g6f6 g5f6 h8g8 b7g7
g8f8 g7g4 c8c5 g4g5
10/27  e3g5 10587  5.19   576337 e3g5 f6e7 f7e7 f5g6 e7e5 h8g8 h3f4 g4f3 f4g6
f3b7
11/28> e3g5 10987  7.17   772614 e3g5 f6e7 f7e7 f5g6 e7e5 h8g8 h3f4 g4f3 f4g6
f3b7 g5e7
11/29  e3g5 11052 13.30  1467122 e3g5 f6e7 f7e7 f5g6 e7e5 h8g8 h3f4 g6f7 b7f7
g8f7 h2g1
12/32> e3g5 11452 18.62  2005101 e3g5 f6e7 f7e7 f5g6 e7e5 h8g8 h3f4 g6f7 b7f7
g8f7 h2g3
12/32  e3g5 11552 41.49  4656709 e3g5 f6e7 f7e7 f5g6 e7e5 h8g8 h3f4 c8e8 f4g6
e8e5 g6e5 g4f5
13/35  e3g5 11724 94.24 10412101 e3g5 f6e7 f7e7 f5g6 e7e5 h8g8 h3f4 c8e8 f4g6
e8e5 g6e5 g4f5 b7b8 g8
h7 g2g4
14/39  e3g5 12123 292.41 33015521 e3g5 f6e7 f7e7 f5g6 e7e5 h8g8 h3f4 c8e8 e5h8
g8h8 f4g6 h8g8 g5f6 e
8e7 g6e7 g8f7 e7g8 f7g8 b7g7 g8f8 g7g4
15/

--Stuart



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