diff --git a/src/search.cpp b/src/search.cpp index 866444a8..5d6babb4 100644 --- a/src/search.cpp +++ b/src/search.cpp @@ -70,9 +70,9 @@ namespace { // Reductions lookup table, initialized at startup int Reductions[MAX_MOVES]; // [depth or moveNumber] - template Depth reduction(bool i, Depth d, int mn) { + Depth reduction(bool i, Depth d, int mn) { int r = Reductions[d / ONE_PLY] * Reductions[mn] / 1024; - return ((r + 512) / 1024 + (!i && r > 1024) - PvNode) * ONE_PLY; + return ((r + 512) / 1024 + (!i && r > 1024)) * ONE_PLY; } constexpr int futility_move_count(bool improving, int depth) { @@ -964,7 +964,7 @@ moves_loop: // When in check, search starts from here continue; // Reduced depth of the next LMR search - int lmrDepth = std::max(newDepth - reduction(improving, depth, moveCount), DEPTH_ZERO); + int lmrDepth = std::max(newDepth - reduction(improving, depth, moveCount), DEPTH_ZERO); lmrDepth /= ONE_PLY; // Countermoves based pruning (~20 Elo) @@ -1012,11 +1012,11 @@ moves_loop: // When in check, search starts from here || moveCountPruning || ss->staticEval + PieceValue[EG][pos.captured_piece()] <= alpha)) { - Depth r = reduction(improving, depth, moveCount); + Depth r = reduction(improving, depth, moveCount); // Decrease reduction if position is or has been on the PV if (ttPv) - r -= ONE_PLY; + r -= 2 * ONE_PLY; // Decrease reduction if opponent's move count is high (~10 Elo) if ((ss-1)->moveCount > 15)