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Subject: Re: Old position.

Author: Tord Romstad

Date: 04:22:20 08/27/03

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On August 26, 2003 at 18:28:34, Dan Andersson wrote:

> This isn't especially har but it is one of the oldest analyzed positions. How
>long for your engine to find the killer move?
>[D]rnbq1bnr/ppp3pp/6k1/3BQ3/4P3/8/PPPP1PPP/RNB1K2R w KQ -

Found at depth 4 in 0.37 seconds by Gothmog 0.3.0 on a Pentium IV 2.4GHz:

 1       7.84     0.00        200 d2d4
 2       5.84     0.01        821 d2d4
 3       4.16     0.11       7431 e5g3 g6h5 g3e5 d8g5 d5f7 h5h6 e5g5 h6g5
                                  d2d4
 4       5.84     0.37      28826 h2h4 h7h5
 5       5.86     0.84      72972 h2h4 h7h5
 6    >  5.88     0.87      75199 h2h4 h7h5
 6    >  5.89     0.90      78115 h2h4 h7h5 d5b7 f8d6 e5a5
 6    <  5.94     2.43     252570 h2h4 h7h5 d5b7 f8d6 e5a5 d6b4 a5b4
 6    >  5.94     2.44     252905 h2h4 h7h5 d5b7 f8d6 e5a5 d6b4 a5b4
 6       5.94     2.45     252905 h2h4 h7h5 d5b7 f8d6 e5a5 d6b4 a5b4
 7    >  5.94     3.05     321697 h2h4 h7h5 d5b7 f8d6 e5a5 d6b4 a5b4
 7    <  5.94     7.27     834224 h2h4 h7h5 d5b7 f8d6 e5a5 d6b4 a5b4 c8b7
                                  b4b7
 7       5.94     7.29     834224 h2h4 h7h5 d5b7 f8d6 e5a5 d6b4 a5b4 c8b7
                                  b4b7
 8    >  5.94     7.68     879427 h2h4 h7h5 d5b7 f8d6 e5a5 d6b4 a5b4 c8b7
                                  b4b7
 8    <  5.94    31.87    3708110 h2h4 h7h5 d5b7 f8d6 e5a5 d6b4 a5b4 c8b7
                                  b4b7
 8       5.94    31.89    3708110 h2h4 h7h5 d5b7 f8d6 e5a5 d6b4 a5b4 c8b7
                                  b4b7

This position is an example of how huge the king safety eval score can
be in Gothmog.  When I ask it to evaluate the root position (without
any search), it returns +6.40 for white!

Tord



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