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Less aggressive move count based futility pruning

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This patch from Joona greatly reduces move count pruning,
below is the old and new move count limits starting from
ONE_PLY with half-play increment:

Old: 4,5,5,5, 7, 7,11,11,11,19,19,19,35,35
New: 4,5,7,9,12,15,19,23,28,33,39,45,52,59

Surprisingly results are even a bit better at a quite
fast time control.

After 5260 games at 30"+0.1
Mod - Orig:  864 - 806 - 3590  ELO +3 (+- 3.8)

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2010-07-04 00:38:49 +03:00 • committed by Marco Costalba
parent a28f4a56d3
commit 3fd0079807
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -366,7 +366,7 @@ void init_search() {
// Init futility move count array // Init futility move count array
for (d = 0; d < 32; d++) for (d = 0; d < 32; d++)
FutilityMoveCountArray[d] = 3 + (1 << (3 * d / 8)); FutilityMoveCountArray[d] = int(3.001 + 0.25 * pow(d, 2.0));
} }