Author: Bas Hamstra
Date: 06:29:12 09/26/04
Go up one level in this thread
On September 26, 2004 at 00:13:20, Stuart Cracraft wrote:
>On September 25, 2004 at 23:59:27, Rick Bischoff wrote:
>
>>Hi,
>>
>>I only do checks if a capturing move results in a check, then I just call
>>alphabeta with a depth of zero.
>
>This is what I do -- apparently it is not very popular amongst people
>with the better programs.
>
>From what I have heard, most of them call the quiescence routine rather
>than do a back and forth between quiescence and main search when
>quiescence is in check.
>
>Perhaps they are concerned about too many extensions in the quiescence
>beyond incheck or checking extensions creeping in.
>
>To them I suggest avoiding the extra extensions by noting where the
>call to main search comes from and disable all but the extensions they
>want.
>
>Stuart
To you I suggest a comparison between your method and mine for wac141. Here is
mine, it needs 0.2 seconds (43k nodes) to find c1f4 and 0.6 seconds (150k nodes)
to see a mate in 6.
2. -184 50 107 g2f1 e8e2
3 -178 60 603 g2f1 f4d5 f6g5
3. -178 60 695 g2f1 f4d5 f6g5
4 -186 60 1478 g2f1 f4d5 c1g5 d5f6 g5f6
4. -186 60 1695 g2f1 f4d5 c1g5 d5f6 g5f6
5 -171 121 15418 g2f1 e8e2 h1h2 g8f8 h2h3
5. -171 121 16257 g2f1 e8e2 h1h2 g8f8 h2h3
6 -216 181 32290 g2f1 e8e2 b3c2 d6b4 f6e5 c7a5 c1f4 e2c2
6 -216 231 46055 c1f4!!
6 318 361 80343 c1f4 d6f4 h4h5 g6h5 h1h5 f4h6 h5h6 c7h2 h6h2
6. 318 361 80738 c1f4 d6f4 h4h5 g6h5 h1h5 f4h6 h5h6 c7h2 h6h2
7 29989 591 149497 c1f4 d6f4 h4h5 g6h5 h1h5 f4h6 h5h6 c7h2 h6h2
g8f8 h2h8
7. 29989 601 149497 c1f4 d6f4 h4h5 g6h5 h1h5 f4h6 h5h6 c7h2 h6h2
g8f8 h2h8
The trick is to generare check-giving moves in the first plies of quisce, so
nullmove will not overlook simple mate in one's. This is not a hard position,
it's an easy one. *Unless* you make your search blind for mates in the last 3
plies, by doing a capture-only qsearch combined with nullmove.
Bas.
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