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Change evaluation GrainSize from 4 to 8

Idea from Joona.

After 999 games at 1+0 on my Intel Core 2 Duo
Orig - Mod: +215 =538 -226 (+11 ELO)

On Joona QUAD after 845 games at 1+0
Orig - Mod: 151 - 181 - 513 (+13 elo)

So it seems a good change !

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
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commit a7cb05b1eba0114dfc4dd666b15c245d73a4bcd4 1 parent 9741694
@mcostalba authored
Showing with 1 addition and 1 deletion.
  1. +1 −1  src/evaluate.cpp
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2  src/evaluate.cpp
@@ -43,7 +43,7 @@ namespace {
const int Sign[2] = { 1, -1 };
// Evaluation grain size, must be a power of 2
- const int GrainSize = 4;
+ const int GrainSize = 8;
// Evaluation weights, initialized from UCI options
int WeightMobilityMidgame, WeightMobilityEndgame;
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