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Limit history range to +-2000

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>
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mcostalba committed Apr 28, 2011
1 parent e656ddc commit bb7713c8e92c9373f0294a4317101cccda0e17e5
Showing with 1 addition and 1 deletion.
  1. +1 −1 src/history.h
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@@ -39,7 +39,7 @@ class History {
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]

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