opelly/Stockfish
1
0
Fork 0
mirror of https://github.com/opelly27/Stockfish.git synced 2026-05-20 05:07:46 +00:00
Code Issues Packages Projects Releases Wiki Activity

Merge static history into main history,

Browse Source 
thus simplifying and reducing the memory footprint.
I believe using static diff for better move ordering is more suited for
low depths, so restrict writing to low depths.

Todo: probably the condition for writing can be simplified

LTC:
LLR: 2.95 (-2.94,2.94) {-0.75,0.25}
Total: 18752 W: 768 L: 705 D: 17279
Ptnml(0-2): 7, 635, 8034, 688, 12
https://tests.stockfishchess.org/tests/view/5fd631791ac169120188859e

STC:
LLR: 2.95 (-2.94,2.94) {-1.25,0.25}
Total: 36504 W: 3380 L: 3313 D: 29811
Ptnml(0-2): 116, 2667, 12645, 2682, 142
https://tests.stockfishchess.org/tests/view/5fd5ed861ac1691201888569

closes https://github.com/official-stockfish/Stockfish/pull/3262

bench: 4018036
This commit is contained in:
pb00067
2020-12-13 21:23:30 +01:00
committed by Joost VandeVondele
parent d862ba4069
commit 16adcb5374
5 changed files with 7 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/search.cpp
+3 -8
View File
@@ -815,13 +815,10 @@ namespace {
tte->save(posKey, VALUE_NONE, ss->ttPv, BOUND_NONE, DEPTH_NONE, MOVE_NONE, eval);
}
// Update static history for previous move
if (is_ok((ss-1)->currentMove) && !(ss-1)->inCheck && !priorCapture)
if ((ss-1)->moveCount > 1 && is_ok((ss-1)->currentMove) && !(ss-1)->inCheck && !priorCapture && depth < 7)
{
int bonus = ss->staticEval > -(ss-1)->staticEval + 2 * Tempo ? -stat_bonus(depth) :
ss->staticEval < -(ss-1)->staticEval + 2 * Tempo ? stat_bonus(depth) :
0;
thisThread->staticHistory[~us][from_to((ss-1)->currentMove)] << bonus;
int bonus = std::clamp(- (depth+1) * 2 * int((ss-1)->staticEval + ss->staticEval - 2 * Tempo), -1000, 1000);
thisThread->mainHistory[~us][from_to((ss-1)->currentMove)] << bonus;
}
// Step 7. Razoring (~1 Elo)
@@ -985,7 +982,6 @@ moves_loop: // When in check, search starts from here
Move countermove = thisThread->counterMoves[pos.piece_on(prevSq)][prevSq];
MovePicker mp(pos, ttMove, depth, &thisThread->mainHistory,
&thisThread->staticHistory,
&thisThread->lowPlyHistory,
&captureHistory,
contHist,
@@ -1536,7 +1532,6 @@ moves_loop: // When in check, search starts from here
// queen and checking knight promotions, and other checks(only if depth >= DEPTH_QS_CHECKS)
// will be generated.
MovePicker mp(pos, ttMove, depth, &thisThread->mainHistory,
&thisThread->staticHistory,
&thisThread->captureHistory,
contHist,
to_sq((ss-1)->currentMove));