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42b77ea)
If the used multiplier of 8 was any number larger than DEPTH_MAX
this would be a non functional patch.
STC 2MB
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 16353 W: 3216 L: 3066 D: 10071
http://tests.stockfishchess.org/tests/view/
55a6d0630ebc590abbe1babd
LTC 8MB
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 134618 W: 21276 L: 20716 D: 92626
http://tests.stockfishchess.org/tests/view/
55a74d760ebc590abbe1bad6
STC 16MB
LLR: 2.96 (-2.94,2.94) [-4.00,0.00]
Total: 22549 W: 4257 L: 4178 D: 14114
http://tests.stockfishchess.org/tests/view/
55a9a2f90ebc590abbe1bb16
Bench:
7372460
Resolves #380
/// TranspositionTable::probe() looks up the current position in the transposition
/// table. It returns true and a pointer to the TTEntry if the position is found.
/// Otherwise, it returns false and a pointer to an empty or least valuable TTEntry
/// TranspositionTable::probe() looks up the current position in the transposition
/// table. It returns true and a pointer to the TTEntry if the position is found.
/// Otherwise, it returns false and a pointer to an empty or least valuable TTEntry
-/// to be replaced later. A TTEntry t1 is considered to be more valuable than a
-/// TTEntry t2 if t1 is from the current search and t2 is from a previous search,
-/// or if the depth of t1 is bigger than the depth of t2.
+/// to be replaced later. TTEntry t1 is considered more valuable than TTEntry t2 if
+/// both are from the current search and the depth of t1 is greater than the depth of t2,
+/// or if t1 is from a previous search but its depth is at least 8 ply deeper than t2.
TTEntry* TranspositionTable::probe(const Key key, bool& found) const {
TTEntry* TranspositionTable::probe(const Key key, bool& found) const {
// Find an entry to be replaced according to the replacement strategy
TTEntry* replace = tte;
for (int i = 1; i < ClusterSize; ++i)
// Find an entry to be replaced according to the replacement strategy
TTEntry* replace = tte;
for (int i = 1; i < ClusterSize; ++i)
- if ( (( tte[i].genBound8 & 0xFC) == generation8)
- - ((replace->genBound8 & 0xFC) == generation8)
- - (tte[i].depth8 < replace->depth8) < 0)
+ if ( (( tte[i].genBound8 & 0xFC) == generation8) * 8 * ONE_PLY + tte[i].depth8
+ < ((replace->genBound8 & 0xFC) == generation8) * 8 * ONE_PLY + replace->depth8)
replace = &tte[i];
return found = false, replace;
replace = &tte[i];
return found = false, replace;