Author: Andrew Platt
Date: 11:09:22 09/02/04
Go up one level in this thread
On September 02, 2004 at 09:45:25, Michael Henderson wrote:
>>>With pruning by evaluation latest movei get it only in 10 plies but I think to
>>>change my pruning to make it see it faster.
>>>
>>>Uri
>
>is recapture extension also playing a role here?...if that applies.
Having shaken some bugs out I'm now trying to understand where else my search
needs to be improved to get this in a reasonable time and re-capture seems to be
a key item. I played around with Crafty a bit and disabled re-capture extensions
(I left mate threat extensions in). Without re-capture things look like this:
9 7.09 -0.88 1. Kf1 a5 2. Rxh5 gxh5 3. Rxh5 Re1+
4. Kxe1 Nxh5 5. Qg5+ Kf8 6. Qh6+ Ke8
7. Qh8+ Bf8 8. Qxh5
9 8.23 +1 1. Qxf4!!
9 8.56 +3 1. Qxf4!!
9 9.24 +M 1. Qxf4!!
9 41.38 10.88 1. Qxf4 Be5 2. dxe5 Rxe5 3. Bxe5 Qb6
4. Rd1 Re7 5. Rd6
9-> 41.38 10.88 1. Qxf4 Be5 2. dxe5 Rxe5 3. Bxe5 Qb6
4. Rd1 Re7 5. Rd6
10 51.88 +1 1. Qxf4!!
10 1:05 +3 1. Qxf4!!
10 1:22 +M 1. Qxf4!!
10 6:22 Mat06 1. Qxf4 Bxf4 2. Rxh5 gxh5 3. Rxh5 Bh6
4. Rxh6 Qh2+ 5. Kxh2 Kf8 6. Rh8#
10-> 6:22 Mat06 1. Qxf4 Bxf4 2. Rxh5 gxh5 3. Rxh5 Bh6
4. Rxh6 Qh2+ 5. Kxh2 Kf8 6. Rh8#
compared to this with both extensions (sorry about the switch from native output
to xboard output):
9 -88 659 4040010 1. Kf1 a5 2. Rxh5 gxh5 3. Rxh5 Re1+ 4. Kxe1 N
xh5 5. Qg5+ Kf8 6. Qh6+ Ke8 7. Qh8+ Bf8 8. Qxh5
9 -77 742 4591270 1. Qxf4!!
9 23 779 4824187 1. Qxf4!!
9 223 862 5373878 1. Qxf4!!
9 32756 6672 48787620 1. Qxf4 Bxf4 2. Rxh5 gxh5 3. Rxh5 Bh6 4. Rxh
6 Qh2+ 5. Kxh2 Kf8 6. Rh8#
9 32756 6672 48788236 1. Qxf4 Bxf4 2. Rxh5 gxh5 3. Rxh5 Bh6 4. Rxh
6 Qh2+ 5. Kxh2 Kf8 6. Rh8#
Andy.
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