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Remove trend

Browse source 
Simplify trend away.

passed Non-regression STC:
https://tests.stockfishchess.org/tests/view/63642a63a90afcecbd1cb887
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 130000 W: 34683 L: 34567 D: 60750
Ptnml(0-2): 455, 14424, 35135, 14522, 464

passed Non-regression LTC:
https://tests.stockfishchess.org/tests/view/636566fda90afcecbd1cded9
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 81592 W: 21938 L: 21787 D: 37867
Ptnml(0-2): 42, 8035, 24490, 8188, 41

closes https://github.com/official-stockfish/Stockfish/pull/4222

Bench: 4239512
This commit is contained in:
disservin 2022-11-03 21:53:02 +01:00 • committed by Joost VandeVondele
parent e048d11825
commit a413900791
3 changed files with 2 additions and 9 deletions
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3
src/evaluate.cpp
View file

@ -981,7 +981,7 @@ namespace {
// Initialize score by reading the incrementally updated scores included in
// the position object (material + piece square tables) and the material
// imbalance. Score is computed internally from the white point of view.
Score score = pos.psq_score() + me->imbalance() + pos.this_thread()->trend;
Score score = pos.psq_score() + me->imbalance();
// Probe the pawn hash table
pe = Pawns::probe(pos);
@ -1115,7 +1115,6 @@ std::string Eval::trace(Position& pos) {
std::memset(scores, 0, sizeof(scores));
// Reset any global variable used in eval
pos.this_thread()->trend = SCORE_ZERO;
pos.this_thread()->bestValue = VALUE_ZERO;
pos.this_thread()->optimism[WHITE] = VALUE_ZERO;
pos.this_thread()->optimism[BLACK] = VALUE_ZERO;

7
src/search.cpp
View file

@ -309,7 +309,6 @@ void Thread::search() {
complexityAverage.set(155, 1);
trend = SCORE_ZERO;
optimism[us] = optimism[~us] = VALUE_ZERO;
int searchAgainCounter = 0;
@ -356,11 +355,7 @@ void Thread::search() {
alpha = std::max(prev - delta,-VALUE_INFINITE);
beta = std::min(prev + delta, VALUE_INFINITE);
// Adjust trend and optimism based on root move's previousScore
int tr = 116 * prev / (std::abs(prev) + 89);
trend = (us == WHITE ? make_score(tr, tr / 2)
: -make_score(tr, tr / 2));
// Adjust optimism based on root move's previousScore
int opt = 118 * prev / (std::abs(prev) + 169);
optimism[ us] = Value(opt);
optimism[~us] = -optimism[us];

1
src/thread.h
View file

@ -75,7 +75,6 @@ public:
ButterflyHistory mainHistory;
CapturePieceToHistory captureHistory;
ContinuationHistory continuationHistory[2][2];
Score trend;
};