HCha/Stockfish
1
0
Fork 0
mirror of https://github.com/HChaZZY/Stockfish.git synced 2025-12-20 17:16:33 +08:00
Code Issues Packages Projects Releases Wiki Activity

Retire grain size code

Browse Source 
Seems useless at long TC.

Tested at 60+0.05
ELO: 2.98 +-2.2 (95%) LOS: 99.6%
Total: 30440 W: 4934 L: 4673 D: 20833

And at 120+0.05
ELO: 2.50 +-2.6 (95%) LOS: 97.1%
Total: 19633 W: 2848 L: 2707 D: 14078

bench: 8502826
This commit is contained in:
renouve
2014-01-02 00:00:44 -05:00
committed by Marco Costalba
parent a646f74e6a
commit 45dbd9cd03
1 changed files with 1 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/evaluate.cpp
View File

@@ -87,9 +87,6 @@ namespace {
Bitboard pinnedPieces[COLOR_NB];
};
// Evaluation grain size, must be a power of 2
const int GrainSize = 4;
// Evaluation weights, initialized from UCI options
enum { Mobility, PawnStructure, PassedPawns, Space, KingDangerUs, KingDangerThem };
Score Weights[6];
@@ -926,8 +923,7 @@ Value do_evaluate(const Position& pos) {
assert(ph >= PHASE_ENDGAME && ph <= PHASE_MIDGAME);
int e = (eg_value(v) * int(sf)) / SCALE_FACTOR_NORMAL;
int r = (mg_value(v) * int(ph) + e * int(PHASE_MIDGAME - ph)) / PHASE_MIDGAME;
return Value((r / GrainSize) * GrainSize); // Sign independent
return Value((mg_value(v) * int(ph) + e * int(PHASE_MIDGAME - ph)) / PHASE_MIDGAME);
}
// apply_weight() weights score v by score w trying to prevent overflow