This patch keeps the low-ply history from the previous move, shifting the data down by 2 ply.
Tested with closedpos book:
STC:
LLR: 2.93 (-2.94,2.94) {-0.50,1.50}
Total: 71584 W: 14175 L: 13891 D: 43518
Ptnml(0-2): 1069, 8228, 16993, 8354, 1148
https://tests.stockfishchess.org/tests/view/
5ec0eaafe9d85f94dc429974
LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 96552 W: 13946 L: 13498 D: 69108
Ptnml(0-2): 676, 9082, 28375, 9404, 739
https://tests.stockfishchess.org/tests/view/
5ec145efe9d85f94dc4299b0
closes https://github.com/official-stockfish/Stockfish/pull/2688
Bench
5148950
mainThread->iterValue[i] = mainThread->bestPreviousScore;
}
+ std::copy(&lowPlyHistory[2][0], &lowPlyHistory.back().back() + 1, &lowPlyHistory[0][0]);
+ std::fill(&lowPlyHistory[MAX_LPH - 2][0], &lowPlyHistory.back().back() + 1, 0);
+
size_t multiPV = Options["MultiPV"];
// Pick integer skill levels, but non-deterministically round up or down
th->rootDepth = th->completedDepth = 0;
th->rootMoves = rootMoves;
th->rootPos.set(pos.fen(), pos.is_chess960(), &setupStates->back(), th);
- th->lowPlyHistory.fill(0);
}
setupStates->back() = tmp;