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Remove unnecessary generation check in TT save

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Checking for generation is unnecessary because if the key matches then the entry was probed and refreshed earlier.

STC 2MB
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 57391 W: 10671 L: 10613 D: 36107
http://tests.stockfishchess.org/tests/view/55ef59fa0ebc5976a2d6da5d

LTC 8MB
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 60732 W: 9260 L: 9199 D: 42273
http://tests.stockfishchess.org/tests/view/55ef8fe60ebc5976a2d6da6b

STC 16MB
LLR: 2.95 (-2.94,2.94) [-4.00,0.00]
Total: 23443 W: 4369 L: 4293 D: 14781
http://tests.stockfishchess.org/tests/view/55ef8fe60ebc5976a2d6da6b

No functional change

Resolves #427
This commit is contained in:
mstembera 2015-09-17 17:13:45 -07:00 • committed by Joona Kiiski
parent 660c38f781
commit 01fab4d432
1 changed files with 1 additions and 1 deletions
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2
src/tt.h
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@ -50,7 +50,7 @@ struct TTEntry {
// Don't overwrite more valuable entries
if ( (k >> 48) != key16
|| d > depth8 - 2
|| g != (genBound8 & 0xFC)
/* || g != (genBound8 & 0xFC) // Any matching keys are already refreshed by probe() */
|| b == BOUND_EXACT)
{
key16 = (uint16_t)(k >> 48);