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

Retire eval optimization from null search

Browse source 
Simplify things preparing for further changes.

bench: 4983282
This commit is contained in:
Marco Costalba 2012-12-01 14:48:13 +01:00
parent 4e5d834e8e
commit 69de670353
1 changed files with 2 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
src/search.cpp
View file

@ -1105,7 +1105,7 @@ split_point_start: // At split points actual search starts from here
Key posKey; Key posKey;
Move ttMove, move, bestMove; Move ttMove, move, bestMove;
Value bestValue, value, ttValue, futilityValue, futilityBase, oldAlpha; Value bestValue, value, ttValue, futilityValue, futilityBase, oldAlpha;
bool givesCheck, enoughMaterial, evasionPrunable, fromNull; bool givesCheck, enoughMaterial, evasionPrunable;
Depth ttDepth; Depth ttDepth;
// To flag BOUND_EXACT a node with eval above alpha and no available moves // To flag BOUND_EXACT a node with eval above alpha and no available moves
@ -1114,7 +1114,6 @@ split_point_start: // At split points actual search starts from here
ss->currentMove = bestMove = MOVE_NONE; ss->currentMove = bestMove = MOVE_NONE;
ss->ply = (ss-1)->ply + 1; ss->ply = (ss-1)->ply + 1;
fromNull = (ss-1)->currentMove == MOVE_NULL;
// Check for an instant draw or maximum ply reached // Check for an instant draw or maximum ply reached
if (pos.is_draw<false, false>() || ss->ply > MAX_PLY) if (pos.is_draw<false, false>() || ss->ply > MAX_PLY)
@ -1152,12 +1151,7 @@ split_point_start: // At split points actual search starts from here
} }
else else
{ {
if (fromNull) if (tte)
{
ss->staticEval = bestValue = -(ss-1)->staticEval;
ss->evalMargin = VALUE_ZERO;
}
else if (tte)
{ {
assert(tte->static_value() != VALUE_NONE || Threads.size() > 1); assert(tte->static_value() != VALUE_NONE || Threads.size() > 1);
@ -1205,7 +1199,6 @@ split_point_start: // At split points actual search starts from here
if ( !PvNode if ( !PvNode
&& !InCheck && !InCheck
&& !givesCheck && !givesCheck
&& !fromNull
&& move != ttMove && move != ttMove
&& enoughMaterial && enoughMaterial
&& type_of(move) != PROMOTION && type_of(move) != PROMOTION