Author: Robert Hyatt
Date: 07:17:10 01/03/02
Go up one level in this thread
On January 03, 2002 at 09:14:01, Benny Antonsson wrote:
>On January 02, 2002 at 23:11:35, Robert Hyatt wrote:
>
>>On January 02, 2002 at 16:38:39, Benny Antonsson wrote:
>>
>>>I read the "rule" that Uri Blass stated and Christophe Theron uses in his
>>>program (Diskussion from oct 2001). Is this something you use in Crafty ?
>>
>>
>>Not particularly. I've had B+wrong rook pawn since the 1970's... I simply
>>let the search handle the special cases and only care that the defending side
>>can reach the queening square before the pawn or the enemy king can assist
>>it...
>But then you must take the bishop in consideration because in this position:
>[D] 8/4k3/8/7P/4B3/5K2/8/8 w - - 0 1
>The black king reaches the queening square before the pawn or the enemy king,
>but black is still loosing. Is this what you call a special case ?
As I said, I let the search help _some_. In this case, it takes no time to
see that the king can't get to h8 in time:
(3) 7 0.10 0.00 1. Kg4 Kf7 2. h6 Kg8 3. Kh5 Kh8 4.
Ba8
7 0.11 ++ 1. h6!!
(2) 7 0.12 4.77 1. h6 Kf7 2. Bh7 Ke6 3. Kg4 Kf6 4.
Kh5
(3) 7-> 0.15 4.77 1. h6 Kf7 2. Bh7 Ke6 3. Kg4 Kf6 4.
Kh5
8 0.16 ++ 1. h6!!
(3) 8-> 0.23 5.16 1. h6 Kf7 2. Bh7 Ke6 3. Kg4 Kf6 4.
Kh5
9 0.23 ++ 1. h6!!
(2) 9 0.29 6.02 1. h6 Kf6 2. Kg4 Kf7 3. Bh7 Kf6 4.
Bd3 Kf7 5. Kg5
9-> 0.38 6.02 1. h6 Kf6 2. Kg4 Kf7 3. Bh7 Kf6 4.
Bd3 Kf7 5. Kg5
10 0.52 -- 1. h6
10 0.67 5.47 1. h6 Kf6 2. Kf4 Kf7 3. Bh7 Kf6 4.
Kg4 Kf7 5. Kg5 Kf8
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