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Code Issues Releases Wiki Activity

Remove recaptures stage in qsearch

Browse source 
Simplify an old commit
72760c05c6.

Search is not stuck on the test position given
r1n1n1b1/1P1P1P1P/1N1N1N2/2RnQrRq/2pKp3/3BNQbQ/k7/4Bq2 w - - 0 1

Passed STC:
https://tests.stockfishchess.org/tests/view/6567050d136acbc573550919
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 236160 W: 59475 L: 59475 D: 117210
Ptnml(0-2): 841, 28266, 59816, 28366, 791

Passed LTC:
https://tests.stockfishchess.org/tests/view/6567d133136acbc573551c78
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 201690 W: 49630 L: 49593 D: 102467
Ptnml(0-2): 128, 23214, 54122, 23255, 126

closes https://github.com/official-stockfish/Stockfish/pull/4896

Bench: 1604361
This commit is contained in:
cj5716 2023-11-29 17:25:01 +08:00 • committed by Disservin
parent 85403a89ba
commit 15d47a2b38
4 changed files with 6 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
src/movepick.cpp
View file

@ -112,15 +112,13 @@ MovePicker::MovePicker(const Position& p,
const ButterflyHistory* mh,
const CapturePieceToHistory* cph,
const PieceToHistory** ch,
const PawnHistory* ph,
Square rs) :
const PawnHistory* ph) :
pos(p),
mainHistory(mh),
captureHistory(cph),
continuationHistory(ch),
pawnHistory(ph),
ttMove(ttm),
recaptureSquare(rs),
depth(d) {
assert(d <= 0);
@ -340,8 +338,7 @@ top:
return select<Next>([&]() { return pos.see_ge(*cur, threshold); });
case QCAPTURE :
if (select<Next>(
[&]() { return depth > DEPTH_QS_RECAPTURES || to_sq(*cur) == recaptureSquare; }))
if (select<Next>([]() { return true; }))
return *(cur - 1);
// If we did not find any move and we do not try checks, we have finished

4
src/movepick.h
View file

@ -152,8 +152,7 @@ class MovePicker {
const ButterflyHistory*,
const CapturePieceToHistory*,
const PieceToHistory**,
const PawnHistory*,
Square);
const PawnHistory*);
MovePicker(const Position&, Move, Value, const CapturePieceToHistory*);
Move next_move(bool skipQuiets = false);
@ -173,7 +172,6 @@ class MovePicker {
Move ttMove;
ExtMove refutations[3], *cur, *endMoves, *endBadCaptures;
int stage;
Square recaptureSquare;
Value threshold;
Depth depth;
ExtMove moves[MAX_MOVES];

2
src/search.cpp
View file

@ -1487,7 +1487,7 @@ Value qsearch(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth) {
// will be generated.
Square prevSq = is_ok((ss - 1)->currentMove) ? to_sq((ss - 1)->currentMove) : SQ_NONE;
MovePicker mp(pos, ttMove, depth, &thisThread->mainHistory, &thisThread->captureHistory,
contHist, &thisThread->pawnHistory, prevSq);
contHist, &thisThread->pawnHistory);
int quietCheckEvasions = 0;

5
src/types.h
View file

@ -205,9 +205,8 @@ constexpr Value PieceValue[PIECE_NB] = {
using Depth = int;
enum : int {
DEPTH_QS_CHECKS = 0,
DEPTH_QS_NO_CHECKS = -1,
DEPTH_QS_RECAPTURES = -5,
DEPTH_QS_CHECKS = 0,
DEPTH_QS_NO_CHECKS = -1,
DEPTH_NONE = -6,