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Improve multiPV mode

Browse source 
Skip all moves during the Non-PV (zero-window) search which will be
searched as PV moves later anyways. We also wake sure the moves will
be reported to the GUI despite they're not being searched — some GUIs
may get confused otherwise, and it would unnecessarily complicate the
code.

Tested with MultiPV=4
STC
http://tests.stockfishchess.org/tests/view/5ce7137c0ebc5925cf070d69
LLR: 2.95 (-2.94,2.94) [0.50,4.50]
Total: 8233 W: 3708 L: 3424 D: 1101

LTC
http://tests.stockfishchess.org/tests/view/5ce798d60ebc5925cf071d17
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 7369 W: 3197 L: 2911 D: 1261

Closes https://github.com/official-stockfish/Stockfish/pull/2163

No functional change. (in single PV mode)
This commit is contained in:
joergoster 2019-06-27 08:56:35 +02:00 • committed by Stéphane Nicolet
parent 4c986b0501
commit a8de07cc26
2 changed files with 8 additions and 2 deletions
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8
src/search.cpp
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@ -292,7 +292,7 @@ void Thread::search() {
bestValue = delta = alpha = -VALUE_INFINITE; bestValue = delta = alpha = -VALUE_INFINITE;
beta = VALUE_INFINITE; beta = VALUE_INFINITE;
size_t multiPV = Options["MultiPV"]; multiPV = Options["MultiPV"];
Skill skill(Options["Skill Level"]); Skill skill(Options["Skill Level"]);
// When playing with strength handicap enable MultiPV search that we will // When playing with strength handicap enable MultiPV search that we will
@ -870,6 +870,12 @@ moves_loop: // When in check, search starts from here
sync_cout << "info depth " << depth / ONE_PLY sync_cout << "info depth " << depth / ONE_PLY
<< " currmove " << UCI::move(move, pos.is_chess960()) << " currmove " << UCI::move(move, pos.is_chess960())
<< " currmovenumber " << moveCount + thisThread->pvIdx << sync_endl; << " currmovenumber " << moveCount + thisThread->pvIdx << sync_endl;
// In MultiPV mode also skip moves which will be searched later as PV moves
if (rootNode && std::count(thisThread->rootMoves.begin() + thisThread->pvIdx + 1,
thisThread->rootMoves.begin() + thisThread->multiPV, move))
continue;
if (PvNode) if (PvNode)
(ss+1)->pv = nullptr; (ss+1)->pv = nullptr;

2
src/thread.h
View file

@ -59,7 +59,7 @@ public:
Pawns::Table pawnsTable; Pawns::Table pawnsTable;
Material::Table materialTable; Material::Table materialTable;
size_t pvIdx, pvLast, shuffleExts; size_t pvIdx, multiPV, pvLast, shuffleExts;
int selDepth, nmpMinPly; int selDepth, nmpMinPly;
Color nmpColor; Color nmpColor;
std::atomic<uint64_t> nodes, tbHits, bestMoveChanges; std::atomic<uint64_t> nodes, tbHits, bestMoveChanges;