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History Stat Comparison

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Adjust LMR by comparing history stats
with opponent (prior ply).

STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 27754 W: 5066 L: 4824 D: 17864

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 216596 W: 28157 L: 27343 D: 161096

Bench: 5437729
This commit is contained in:
VoyagerOne 2016-10-24 10:05:02 -04:00 • committed by Marco Costalba
parent e18321f55a
commit e77f38c431
2 changed files with 17 additions and 7 deletions
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19
src/search.cpp
View file

@ -570,6 +570,7 @@ namespace {
Thread* thisThread = pos.this_thread(); Thread* thisThread = pos.this_thread();
inCheck = pos.checkers(); inCheck = pos.checkers();
moveCount = quietCount = ss->moveCount = 0; moveCount = quietCount = ss->moveCount = 0;
ss->history = VALUE_ZERO;
bestValue = -VALUE_INFINITE; bestValue = -VALUE_INFINITE;
ss->ply = (ss-1)->ply + 1; ss->ply = (ss-1)->ply + 1;
@ -994,14 +995,22 @@ moves_loop: // When in check search starts from here
&& !pos.see_ge(make_move(to_sq(move), from_sq(move)), VALUE_ZERO)) && !pos.see_ge(make_move(to_sq(move), from_sq(move)), VALUE_ZERO))
r -= 2 * ONE_PLY; r -= 2 * ONE_PLY;
// Decrease/increase reduction for moves with a good/bad history ss->history = thisThread->history[moved_piece][to_sq(move)]
Value val = thisThread->history[moved_piece][to_sq(move)]
+ (cmh ? (*cmh )[moved_piece][to_sq(move)] : VALUE_ZERO) + (cmh ? (*cmh )[moved_piece][to_sq(move)] : VALUE_ZERO)
+ (fmh ? (*fmh )[moved_piece][to_sq(move)] : VALUE_ZERO) + (fmh ? (*fmh )[moved_piece][to_sq(move)] : VALUE_ZERO)
+ (fmh2 ? (*fmh2)[moved_piece][to_sq(move)] : VALUE_ZERO) + (fmh2 ? (*fmh2)[moved_piece][to_sq(move)] : VALUE_ZERO)
+ thisThread->fromTo.get(~pos.side_to_move(), move); + thisThread->fromTo.get(~pos.side_to_move(), move)
int rHist = (val - 8000) / 20000; - 8000; // Correction factor
r = std::max(DEPTH_ZERO, (r / ONE_PLY - rHist) * ONE_PLY);
// Decrease/increase reduction by comparing opponent's stat score
if (ss->history > VALUE_ZERO && (ss-1)->history < VALUE_ZERO)
r -= ONE_PLY;
else if (ss->history < VALUE_ZERO && (ss-1)->history > VALUE_ZERO)
r += ONE_PLY;
// Decrease/increase reduction for moves with a good/bad history
r = std::max(DEPTH_ZERO, (r / ONE_PLY - ss->history / 20000) * ONE_PLY);
} }
Depth d = std::max(newDepth - r, ONE_PLY); Depth d = std::max(newDepth - r, ONE_PLY);

1
src/search.h
View file

@ -43,6 +43,7 @@ struct Stack {
Move excludedMove; Move excludedMove;
Move killers[2]; Move killers[2];
Value staticEval; Value staticEval;
Value history;
bool skipEarlyPruning; bool skipEarlyPruning;
int moveCount; int moveCount;
CounterMoveStats* counterMoves; CounterMoveStats* counterMoves;