Author: Andrew Williams
Date: 17:14:55 08/01/99
Go up one level in this thread
On August 01, 1999 at 19:27:03, Scott Gasch wrote:
>
>How deep do people search null moves and what is the approximate success rate of
>a null move search? I am searching to depth - 3 and seeing about a 40% success
>rate (i.e. I can return beta right away about 40% of the time...)
>
>Scott
Hi Scott,
Try this position in your program ("o" = black Pawn):
8 r . . . k . . r
7 o . . q n o b .
6 . o o . . . o .
5 . . . o P . B o
4 . . . P . . n .
3 Q . N B . . . .
2 P P . . R P P P
1 R . . . . . K .
a b c d e f g h
The FEN is:
r3k2r/p2qnpb1/1pp3p1/3pP1Bp/3P2n1/Q1NB4/PP2RPPP/R5K1 w kq - 0 1
When I search this on mine for sixty seconds, I get 87% success rate on my null
move. My null move searches to depth-2. (BTW, my program finds the solution,
1.e6, in 32 seconds at the moment). This rate of 87-88% seems fairly typical
for my program.
Andrew Williams
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