kate/BadFish
1
0
Fork 0
mirror of https://github.com/sockspls/badfish synced 2025-07-11 19:49:14 +00:00
Code Issues Releases Wiki Activity

Use evaluation margins also in main search

Browse source 
For now keep FutilityMarginsMatrix[] unchanged, in
future we are going to reduce to compensate for extra
margin.

At this moment it is enough we don't have regressions.

After 9694 games on russian cluster
Mod - Orig 1608 - 1578 - 6508  ELO +1 (+- 2.8)

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-08-20 09:49:13 +02:00
parent d9dc9dbd65
commit b177e6dd91
1 changed files with 3 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
src/search.cpp
View file

@ -982,7 +982,7 @@ namespace {
Move ttMove, move, excludedMove, threatMove; Move ttMove, move, excludedMove, threatMove;
Depth ext, newDepth; Depth ext, newDepth;
Value bestValue, value, oldAlpha; Value bestValue, value, oldAlpha;
Value refinedValue, nullValue, futilityValueScaled; // Non-PV specific Value refinedValue, nullValue, futilityBase, futilityValueScaled; // Non-PV specific
bool isCheck, singleEvasion, singularExtensionNode, moveIsCheck, captureOrPromotion, dangerous; bool isCheck, singleEvasion, singularExtensionNode, moveIsCheck, captureOrPromotion, dangerous;
bool mateThreat = false; bool mateThreat = false;
int moveCount = 0; int moveCount = 0;
@ -1182,6 +1182,7 @@ namespace {
CheckInfo ci(pos); CheckInfo ci(pos);
ss->bestMove = MOVE_NONE; ss->bestMove = MOVE_NONE;
singleEvasion = isCheck && mp.number_of_evasions() == 1; singleEvasion = isCheck && mp.number_of_evasions() == 1;
futilityBase = ss->eval + margins[pos.side_to_move()];
singularExtensionNode = depth >= SingularExtensionDepth[PvNode] singularExtensionNode = depth >= SingularExtensionDepth[PvNode]
&& tte && tte
&& tte->move() && tte->move()
@ -1253,7 +1254,7 @@ namespace {
// We illogically ignore reduction condition depth >= 3*ONE_PLY for predicted depth, // We illogically ignore reduction condition depth >= 3*ONE_PLY for predicted depth,
// but fixing this made program slightly weaker. // but fixing this made program slightly weaker.
Depth predictedDepth = newDepth - reduction<NonPV>(depth, moveCount); Depth predictedDepth = newDepth - reduction<NonPV>(depth, moveCount);
futilityValueScaled = ss->eval + futility_margin(predictedDepth, moveCount) futilityValueScaled = futilityBase + futility_margin(predictedDepth, moveCount)
+ H.gain(pos.piece_on(move_from(move)), move_to(move)); + H.gain(pos.piece_on(move_from(move)), move_to(move));
if (futilityValueScaled < beta) if (futilityValueScaled < beta)