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Subject: Re: Another good underpromotion test position

Author: Tord Romstad

Date: 07:35:46 07/24/03

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On July 23, 2003 at 22:03:19, Matthias Gemuh wrote:

>On July 23, 2003 at 19:22:24, Tord Romstad wrote:
>>
>> 1      -0.62     0.00          6 a4d4 c3d4
>> 1      -0.14     0.00         27 a4b5
>> 1    > -0.14     0.00         52 a4a3 c3d2
>> 1      -0.12     0.00         59 a4a3 c3d2
>> 1       0.20     0.00         62 a4a2
>> 2    >  0.70     0.00        135 a4a2 e4g6 f7g6
>> 2       0.70     0.00        239 a4a2 d4d3
>> 2    >  0.70     0.00        480 a4a1 e4g6 f7g6
>> 2       1.20     0.00        653 a4a1 c3c4
>> 3    >  1.70     0.01       1260 a4a1 c3c4 b2b1Q
>> 3       2.59     0.01       1934 a4a1 e4g6 f7g6 d4d7 h7g8 d7e8 g8h7
>> 4    <  2.09     0.02       3242 a4a1 e4g6 f7g6 d4d7 h7g8 d7e8 g8g7 e8e7
>>                                  g7g8
>> 4       0.23     0.02       4666 a4a1 e4g6 h7g6 d4b6 g6f5 b6b2 a1b2 c3b2
>> 4    >  0.23     0.02       5004 b2b1N e4b1 a4a1 c3c4 a1b1
>> 4       1.74     0.02       5092 b2b1N e4b1 a4a1 c3d3 a1b1 d3e3
>> 5       1.99     0.11      20689 b2b1N e4b1 a4a1 c3c4 a1b1 c4d5
>> 6       2.12     0.16      32948 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 b1c2 e2f1
>>                                  c2c1 f1g2
>> 7       2.25     0.23      50928 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 b1h1 d4f6
>>                                  h1d5
>> 8       2.23     0.49     123152 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 b1c1 d4d2
>>                                  c1h1
>> 9       2.12     1.08     309778 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 b1b5 e2e1
>>                                  b5f5 h3h4 f7f6
>>10       2.09     2.60     811155 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 b1b5 e2e1
>>                                  b5f5 h3h4 f5b1 e1e2 b1c2 e2e1 f7f5
>>
>>
>>Does Doctor? have checks in its qsearch?  How about BigLion, Bogo and T.rex?
>>
>>Tord
>
>
>
>BigLion ? no checks in QSearch().

OK, this confirms my suspicion that checks in qsearch have a great influence
on the solution time at this position.

Have you tried searching checks in qsearch?  It is worth a try, IMHO.  It
seems that different people have very different experiences with this, but my
program plays much worse in the middle game when I remove the checks.  In
the endgame it is less clear; I am currently experimenting with this.

Tord



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