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Limit history range to +-2000

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Extensive test series on tweaking history limit and bonus
formula. At the end this was the best.

After 11959 games:

Mod vs Orig 2087 - 1934 - 7938 ELO +4 (+- 3.7) LOS 92%

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-04-28 08:00:10 +01:00
parent e656ddcf18
commit bb7713c8e9
1 changed files with 1 additions and 1 deletions
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2
src/history.h
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@@ -39,7 +39,7 @@ public:
Value gain(Piece p, Square to) const;
void update_gain(Piece p, Square to, Value g);
static const Value MaxValue = Value(1 << 29); // To avoid an overflow
static const Value MaxValue = Value(2000);
private:
Value history[16][64]; // [piece][to_square]