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Simplify Away Refutation Stage

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Simplify away killer stage to a constant bonus given to the killer move during
quiet move scoring.

Passed Non-regression STC (Against then-pending PR #5472):
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 106176 W: 27685 L: 27539 D: 50952
Ptnml(0-2): 410, 12765, 26637, 12821, 455
https://tests.stockfishchess.org/tests/view/668dd0835034141ae5999e8f

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 92472 W: 23426 L: 23276 D: 45770
Ptnml(0-2): 55, 10376, 25215, 10544, 46
https://tests.stockfishchess.org/tests/view/669019e45034141ae5999fd2

closes https://github.com/official-stockfish/Stockfish/pull/5476

Bench 1459677
This commit is contained in:
Shawn Xu 2024-07-09 13:04:47 -05:00 • committed by Joost VandeVondele
parent 42aae5fe8b
commit 3df09c04d7
2 changed files with 11 additions and 20 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

19
src/movepick.cpp
View file

@ -34,7 +34,6 @@ enum Stages {
MAIN_TT,
CAPTURE_INIT,
GOOD_CAPTURE,
KILLER,
QUIET_INIT,
GOOD_QUIET,
BAD_CAPTURE,
@ -97,7 +96,7 @@ MovePicker::MovePicker(const Position& p,
continuationHistory(ch),
pawnHistory(ph),
ttMove(ttm),
killer{km, 0},
killer(km),
depth(d) {
assert(d > 0);
@ -184,6 +183,8 @@ void MovePicker::score() {
m.value += (*continuationHistory[3])[pc][to];
m.value += (*continuationHistory[5])[pc][to];
m.value += (m == killer) * 65536;
// bonus for checks
m.value += bool(pos.check_squares(pt) & to) * 16384;
@ -270,16 +271,6 @@ top:
++stage;
[[fallthrough]];
case KILLER :
// increment it before so if we aren't stuck here indefinitely
++stage;
if (killer != ttMove && killer != Move::none() && !pos.capture_stage(killer)
&& pos.pseudo_legal(killer))
return killer;
[[fallthrough]];
case QUIET_INIT :
if (!skipQuiets)
{
@ -294,7 +285,7 @@ top:
[[fallthrough]];
case GOOD_QUIET :
if (!skipQuiets && select<Next>([&]() { return *cur != killer; }))
if (!skipQuiets && select<Next>([]() { return true; }))
{
if ((cur - 1)->value > -7998 || (cur - 1)->value <= quiet_threshold(depth))
return *(cur - 1);
@ -323,7 +314,7 @@ top:
case BAD_QUIET :
if (!skipQuiets)
return select<Next>([&]() { return *cur != killer; });
return select<Next>([]() { return true; });
return Move::none();

12
src/movepick.h
View file

@ -184,12 +184,12 @@ class MovePicker {
const CapturePieceToHistory* captureHistory;
const PieceToHistory** continuationHistory;
const PawnHistory* pawnHistory;
Move ttMove;
ExtMove killer, *cur, *endMoves, *endBadCaptures, *beginBadQuiets, *endBadQuiets;
int stage;
int threshold;
Depth depth;
ExtMove moves[MAX_MOVES];
Move ttMove, killer;
ExtMove * cur, *endMoves, *endBadCaptures, *beginBadQuiets, *endBadQuiets;
int stage;
int threshold;
Depth depth;
ExtMove moves[MAX_MOVES];
};
} // namespace Stockfish