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Subject: LambChop 10.88 has problem under Fritz-7-GUI (Evaluation with mate)

Author: Peter Ackermann

Date: 23:37:31 05/19/02


Hi!

I like LambChop 10.88 very much and here it runs with about 75 nps (under
Fritz-7-GUI 800MHz Pentium III).
I have discovered one problem (under Fritz-7-GUI) which is not so important
while using the engine for analysis but can cause trouble at eng-eng-matches:
LambChop changes it evaluations when seeing a mate to opposite figures:

[D] r1br4/1p2np1p/4p1p1/pqp1B1k1/2N1R3/1P1P2P1/1PP2PBP/R5K1 w - - 0 1

Under the Fritz-7-GUI:

Analysis by LambChop 10.88:

21.Sd6
-+ (-4.13) Tiefe: 1 00:00:00
21.Sd6 Txd6 22.Lxd6
-+ (-3.03) Tiefe: 2 00:00:00
21.Lf4+ Kf5 22.Sd6+ Txd6 23.Lxd6
-+ (-2.63) Tiefe: 3 00:00:00
21.Lf4+ Kf5 22.Te5+ Kf6 23.Lg5+ Kg7 24.Lxe7
-+ (-2.12) Tiefe: 4 00:00:00
21.Lf4+ Kf6 22.Le5+
= (0.00) Tiefe: 5 00:00:00
21.Lg7 Txd3 22.Sd6 Td1+ 23.Txd1 Db6 24.Sxf7+ Kh5
± (1.23) Tiefe: 6 00:00:03 210kN
21.Lg7 Txd3 22.cxd3 Kh5 23.Th4+ Kg5 24.f4+ Kf5 25.Se3#
-+ (-310.73) Tiefe: 7 00:00:25 1757kN
21.Lg7 Txd3 22.cxd3 Kh5 23.Th4+ Kg5 24.f4+ Kf5 25.Se3#
-+ (-310.73) Tiefe: 8 00:00:29 1941kN
21.Lg7 Txd3
-+ (-310.73) Tiefe: 9 00:00:32 2280kN
21.Lg7 Txd3 22.cxd3 Kh5 23.Th4+ Kg5 24.f4+ Kf5 25.Se3#
-+ (-310.73) Tiefe: 10 00:00:42 3242kN
21.Lg7 Txd3 22.cxd3 Kh5 23.Th4+ Kg5 24.f4+ Kf5 25.Se3#
-+ (-310.73) Tiefe: 11 00:01:12 5879kN

Under the Shredder-6-classic-GUI:

LambChop 10.88
1.00 0:00 -4.13 1.Sd6 (76)
2.00 0:00 -3.03 1.Sd6 Txd6 2.Lxd6 (387)
3.00 0:00 -3.03 1.Sd6 Txd6 2.Lxd6 (1.000)
4.00 0:00 -2.63 1.Sd6 Txd6 2.Lf4+ Kf6 3.Le5+ Kf5 4.Lxd6 (3.028)
5.00 0:00 -0.68 1.Lf4+ (10.722)
6.00 0:03 +1.23 1.Lg7 Txd3 2.Sd6 Td1+ 3.Txd1 Db6 4.Sxf7+ Kh5 (215.187) 71.7
7.44 0:24 +999.99 1.Lg7 Txd3 2.cxd3 Kh5 3.Lf3+ Kg5 4.Te5+ Sf5 5.h4+ (1.853.335)
77.2
8.44 0:26 +999.99 1.Lg7 Txd3 2.cxd3 Kh5 3.Lf3+ Kg5 4.Te5+ Sf5 5.h4+ (2.048.097)
78.7
9.44 0:30 +999.99 1.Lg7 Txd3 (2.383.105) 79.4

Problem is that in some occasions GUI resigns a game because LambChop is sending
a very bad evaluation three times in a row...

I think it is a bug in the Fritz-7-GUI not in the engine?!

Peter




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