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New easy move implementation

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Spend much less time in positions where one move is much better than all other alternatives.
We carry forward pv stability information from the previous search to identify such positions.
It's based on my old InstaMove idea but with two significant improvements.

1) Much better instability detection inside the search itself.
2) When it's time to make a FastMove we no longer make it instantly but still spend at least 10% of normal time verifying it.

Credit to Gull for the inspiration.
BIG thanks to Gary because this would not work without accurate PV!

20K
ELO: 8.22 +-3.0 (95%) LOS: 100.0%
Total: 20000 W: 4203 L: 3730 D: 12067

STC
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 23266 W: 4662 L: 4492 D: 14112

LTC
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 12470 W: 2091 L: 1931 D: 8448

Resolves #283
This commit is contained in:
mstembera
2015-03-12 19:49:30 +00:00
committed by Joona Kiiski
parent 13c11f4048
commit 062ca91db5
2 changed files with 79 additions and 16 deletions
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2
src/timeman.h
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@@ -27,7 +27,7 @@ class TimeManager {
public:
void init(const Search::LimitsType& limits, Color us, int ply);
void pv_instability(double bestMoveChanges) { unstablePvFactor = 1 + bestMoveChanges; }
int available_time() const { return int(optimumSearchTime * unstablePvFactor * 0.71); }
int available_time() const { return int(optimumSearchTime * unstablePvFactor * 0.76); }
int maximum_time() const { return maximumSearchTime; }
private: