diff --git a/src/search.cpp b/src/search.cpp index b9ce9a62..f47507f7 100644 --- a/src/search.cpp +++ b/src/search.cpp @@ -297,7 +297,7 @@ void Thread::search() { mainThread->bestMoveChanges = 0; } - size_t multiPV = Options["MultiPV"]; + multiPV = Options["MultiPV"]; Skill skill(Options["Skill Level"]); // When playing with strength handicap enable MultiPV search that we will @@ -802,12 +802,20 @@ moves_loop: // When in check search starts from here if (move == excludedMove) continue; - // At root obey the "searchmoves" option and skip moves not listed in Root - // Move List. As a consequence any illegal move is also skipped. In MultiPV - // mode we also skip PV moves which have been already searched. - if (rootNode && !std::count(thisThread->rootMoves.begin() + thisThread->PVIdx, - thisThread->rootMoves.end(), move)) - continue; + if (rootNode) + { + // At root obey the "searchmoves" option and skip moves not listed in Root + // Move List. As a consequence any illegal move is also skipped. + if (!std::count(thisThread->rootMoves.begin() + thisThread->PVIdx, + thisThread->rootMoves.end(), move)) + continue; + + // In MultiPV mode we not only skip PV moves which have already been searched, + // but also any other move except we have reached the last PV line. + if ( thisThread->PVIdx + 1 < thisThread->multiPV + && move != ttMove) + continue; + } ss->moveCount = ++moveCount; @@ -1527,7 +1535,7 @@ string UCI::pv(const Position& pos, Depth depth, Value alpha, Value beta) { int elapsed = Time.elapsed() + 1; const RootMoves& rootMoves = pos.this_thread()->rootMoves; size_t PVIdx = pos.this_thread()->PVIdx; - size_t multiPV = std::min((size_t)Options["MultiPV"], rootMoves.size()); + size_t multiPV = pos.this_thread()->multiPV; uint64_t nodesSearched = Threads.nodes_searched(); uint64_t tbHits = Threads.tb_hits() + (TB::RootInTB ? rootMoves.size() : 0); diff --git a/src/thread.h b/src/thread.h index 13974497..494fdb15 100644 --- a/src/thread.h +++ b/src/thread.h @@ -60,7 +60,7 @@ public: Pawns::Table pawnsTable; Material::Table materialTable; Endgames endgames; - size_t PVIdx; + size_t PVIdx, multiPV; int selDepth, nmp_ply, nmp_odd; std::atomic nodes, tbHits;