Update comments in LMR step

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 4738b27b2bb980fb4202b988a9c47f740caf91d5..0cee3aa93d382b49d4d5c4566d5fb6980f359514 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -187,6 +187,8 @@ void Search::clear() {
       th->history.clear();
       th->counterMoves.clear();
   }
+
+  Threads.main()->previousMoveScore = VALUE_INFINITE;
 }
 
 
@@ -337,6 +339,8 @@ void MainThread::search() {
               bestThread = th;
   }
 
+  previousMoveScore = bestThread->rootMoves[0].score;
+
   // Send new PV when needed
   if (bestThread != this)
       sync_cout << UCI::pv(bestThread->rootPos, bestThread->completedDepth, -VALUE_INFINITE, VALUE_INFINITE) << sync_endl;
@@ -536,10 +540,12 @@ void Thread::search() {
               // of the available time has been used or we matched an easyMove
               // from the previous search and just did a fast verification.
               if (   rootMoves.size() == 1
-                  || Time.elapsed() > Time.available() * (mainThread->failedLow ? 641 : 315) / 640
-                  || (mainThread->easyMovePlayed = (   rootMoves[0].pv[0] == easyMove
-                                                    && mainThread->bestMoveChanges < 0.03
-                                                    && Time.elapsed() > Time.available() / 8)))
+                  || Time.elapsed() > Time.available() * ( 640  - 160 * !mainThread->failedLow 
+                     - 126 * (bestValue >= mainThread->previousMoveScore)  
+                     - 124 * (bestValue >= mainThread->previousMoveScore && !mainThread->failedLow))/640
+                  || ( mainThread->easyMovePlayed = ( rootMoves[0].pv[0] == easyMove
+                                                     && mainThread->bestMoveChanges < 0.03
+                                                     && Time.elapsed() > Time.available() * 25/206)))
               {
                   // If we are allowed to ponder do not stop the search now but
                   // keep pondering until the GUI sends "ponderhit" or "stop".
@@ -999,7 +1005,9 @@ moves_loop: // When in check search starts from here
               && cmh[pos.piece_on(to_sq(move))][to_sq(move)] > VALUE_ZERO)
               r = std::max(DEPTH_ZERO, r - ONE_PLY);
 
-          // Decrease reduction for moves that escape a capture
+          // Decrease reduction for moves that escape a capture. Filter out castling
+          // moves because are coded as "king captures rook" and break make_move().
+          // Also use see() instead of see_sign() because destination square is empty.
           if (   r
               && type_of(move) == NORMAL
               && type_of(pos.piece_on(to_sq(move))) != PAWN