HCha/Stockfish
1
0
Fork 0
mirror of https://github.com/HChaZZY/Stockfish.git synced 2025-12-23 02:27:00 +08:00
Code Issues Packages Projects Releases Wiki Activity

History gravity

Browse Source 
Instead of using hard coded Min and Max values for history,
always adjust the old value slightly downwards before adding a new value.

The adjustment acts like gravity that prevents the value escaping too
far from zero.

Bench: 8020484

Resolves #407
This commit is contained in:
Joona Kiiski
2015-08-25 20:52:44 +01:00
parent 087b638f6c
commit 7f300a7698
1 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/movepick.h
View File

@@ -39,7 +39,7 @@
template<typename T> template<typename T>
struct Stats { struct Stats {
static const Value Max = Value(250); static const Value Max = Value(1<<28);
const T* operator[](Piece pc) const { return table[pc]; } const T* operator[](Piece pc) const { return table[pc]; }
T* operator[](Piece pc) { return table[pc]; } T* operator[](Piece pc) { return table[pc]; }
@@ -53,8 +53,8 @@ struct Stats {
void update(Piece pc, Square to, Value v) { void update(Piece pc, Square to, Value v) {
if (abs(table[pc][to] + v) < Max) table[pc][to] -= table[pc][to] * std::min(abs(int(v)), 512) / 512;
table[pc][to] += v; table[pc][to] += int(v) * 64;
} }
private: private: