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Try only recaptures in qsearch if depth is very low

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This avoids search explosion in qsearch for some
patological cases like:

r1n1n1b1/1P1P1P1P/1N1N1N2/2RnQrRq/2pKp3/3BNQbQ/k7/4Bq2 w - - 0 1

After 9078 games 20"+0.1 QUAD:
Mod vs Orig 1413 - 1319 - 6346 ELO +3 (+- 4)

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-06-12 07:25:51 +01:00
parent 15683034a7
commit 72760c05c6
4 changed files with 27 additions and 7 deletions
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7
src/types.h
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@@ -201,9 +201,10 @@ enum Depth {
ONE_PLY = 2,
DEPTH_ZERO = 0 * ONE_PLY,
DEPTH_QS_CHECKS = -1 * ONE_PLY,
DEPTH_QS_NO_CHECKS = -2 * ONE_PLY,
DEPTH_ZERO = 0 * ONE_PLY,
DEPTH_QS_CHECKS = -1 * ONE_PLY,
DEPTH_QS_NO_CHECKS = -2 * ONE_PLY,
DEPTH_QS_RECAPTURES = -4 * ONE_PLY,
DEPTH_NONE = -127 * ONE_PLY
};