Tweak Late Move Reduction at root

[stockfish] / src / thread.cpp

diff --git a/src/thread.cpp b/src/thread.cpp
index e69120842c58f0be117c0b16e2c7800b14f54d26..5165fd90ae949e17ade2e2d8453f552e16fc053c 100644 (file)
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -18,9 +18,9 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include <algorithm> // For std::count
 #include <cassert>
 
+#include <algorithm> // For std::count
 #include "movegen.h"
 #include "search.h"
 #include "thread.h"
@@ -32,7 +32,7 @@ ThreadPool Threads; // Global object
 
 
 /// Thread constructor launches the thread and waits until it goes to sleep
-/// in idle_loop(). Note that 'searching' and 'exit' should be alredy set.
+/// in idle_loop(). Note that 'searching' and 'exit' should be already set.
 
 Thread::Thread(size_t n) : idx(n), stdThread(&Thread::idle_loop, this) {
 
@@ -52,6 +52,15 @@ Thread::~Thread() {
   stdThread.join();
 }
 
+/// Thread::bestMoveCount(Move move) return best move counter for the given root move
+
+int Thread::best_move_count(Move move) {
+
+  auto rm = std::find(rootMoves.begin() + pvIdx,
+                      rootMoves.begin() + pvLast, move);
+
+  return rm != rootMoves.begin() + pvLast ? rm->bestMoveCount : 0;
+}
 
 /// Thread::clear() reset histories, usually before a new game
 
@@ -136,10 +145,10 @@ void ThreadPool::set(size_t requested) {
       while (size() < requested)
           push_back(new Thread(size()));
       clear();
-  }
 
-  // Reallocate the hash with the new threadpool size
-  TT.resize(Options["Hash"]);
+      // Reallocate the hash with the new threadpool size
+      TT.resize(Options["Hash"]);
+  }
 }
 
 /// ThreadPool::clear() sets threadPool data to initial values.
@@ -162,8 +171,8 @@ void ThreadPool::start_thinking(Position& pos, StateListPtr& states,
 
   main()->wait_for_search_finished();
 
-  stopOnPonderhit = stop = false;
-  ponder = ponderMode;
+  main()->stopOnPonderhit = stop = false;
+  main()->ponder = ponderMode;
   Search::Limits = limits;
   Search::RootMoves rootMoves;
 
@@ -191,7 +200,7 @@ void ThreadPool::start_thinking(Position& pos, StateListPtr& states,
 
   for (Thread* th : *this)
   {
-      th->nodes = th->tbHits = th->nmpMinPly = 0;
+      th->shuffleExts = th->nodes = th->tbHits = th->nmpMinPly = 0;
       th->rootDepth = th->completedDepth = DEPTH_ZERO;
       th->rootMoves = rootMoves;
       th->rootPos.set(pos.fen(), pos.is_chess960(), &setupStates->back(), th);