Adjust NNUE usage based on number of pawns in position

[stockfish] / src / thread.cpp

diff --git a/src/thread.cpp b/src/thread.cpp
index c171312203f2125d9acfff40c892e09011231e58..44aea14e6e0aab0a2d11d03ce9f4817a3fe12fff 100644 (file)
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -1,8 +1,6 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
-  Copyright (C) 2015-2020 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
+  Copyright (C) 2004-2020 The Stockfish developers (see AUTHORS file)
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -52,6 +50,7 @@ Thread::~Thread() {
   stdThread.join();
 }
 
+
 /// Thread::bestMoveCount(Move move) return best move counter for the given root move
 
 int Thread::best_move_count(Move move) const {
@@ -62,6 +61,7 @@ int Thread::best_move_count(Move move) const {
   return rm != rootMoves.begin() + pvLast ? rm->bestMoveCount : 0;
 }
 
+
 /// Thread::clear() reset histories, usually before a new game
 
 void Thread::clear() {
@@ -81,6 +81,7 @@ void Thread::clear() {
       }
 }
 
+
 /// Thread::start_searching() wakes up the thread that will start the search
 
 void Thread::start_searching() {
@@ -158,7 +159,8 @@ void ThreadPool::set(size_t requested) {
   }
 }
 
-/// ThreadPool::clear() sets threadPool data to initial values.
+
+/// ThreadPool::clear() sets threadPool data to initial values
 
 void ThreadPool::clear() {
 
@@ -170,6 +172,7 @@ void ThreadPool::clear() {
   main()->previousTimeReduction = 1.0;
 }
 
+
 /// ThreadPool::start_thinking() wakes up main thread waiting in idle_loop() and
 /// returns immediately. Main thread will wake up other threads and start the search.
 
@@ -208,7 +211,7 @@ void ThreadPool::start_thinking(Position& pos, StateListPtr& states,
 
   for (Thread* th : *this)
   {
-      th->nodes = th->tbHits = th->nmpMinPly = 0;
+      th->nodes = th->tbHits = th->nmpMinPly = th->bestMoveChanges = 0;
       th->rootDepth = th->completedDepth = 0;
       th->rootMoves = rootMoves;
       th->rootPos.set(pos.fen(), pos.is_chess960(), &setupStates->back(), th);
@@ -218,3 +221,54 @@ void ThreadPool::start_thinking(Position& pos, StateListPtr& states,
 
   main()->start_searching();
 }
+
+Thread* ThreadPool::get_best_thread() const {
+
+    Thread* bestThread = front();
+    std::map<Move, int64_t> votes;
+    Value minScore = VALUE_NONE;
+
+    // Find minimum score of all threads
+    for (Thread* th: *this)
+        minScore = std::min(minScore, th->rootMoves[0].score);
+
+    // Vote according to score and depth, and select the best thread
+    for (Thread* th : *this)
+    {
+        votes[th->rootMoves[0].pv[0]] +=
+            (th->rootMoves[0].score - minScore + 14) * int(th->completedDepth);
+
+          if (abs(bestThread->rootMoves[0].score) >= VALUE_TB_WIN_IN_MAX_PLY)
+          {
+              // Make sure we pick the shortest mate / TB conversion or stave off mate the longest
+              if (th->rootMoves[0].score > bestThread->rootMoves[0].score)
+                  bestThread = th;
+          }
+          else if (   th->rootMoves[0].score >= VALUE_TB_WIN_IN_MAX_PLY
+                   || (   th->rootMoves[0].score > VALUE_TB_LOSS_IN_MAX_PLY
+                       && votes[th->rootMoves[0].pv[0]] > votes[bestThread->rootMoves[0].pv[0]]))
+              bestThread = th;
+    }
+
+    return bestThread;
+}
+
+
+/// Start non-main threads
+
+void ThreadPool::start_searching() {
+
+    for (Thread* th : *this)
+        if (th != front())
+            th->start_searching();
+}
+
+
+/// Wait for non-main threads
+
+void ThreadPool::wait_for_search_finished() const {
+
+    for (Thread* th : *this)
+        if (th != front())
+            th->wait_for_search_finished();
+}