X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fsearch.cpp;h=0d5362e7fcbde939760f55dd856c2a8ab913e165;hb=55b5b03273e9740b63663ee84a17788c5424eec3;hp=8e3e0dab0910e04a2470a300fb86fc4f703107c9;hpb=9a595359628d82026513f7e978d40e944194b057;p=stockfish

diff --git a/src/search.cpp b/src/search.cpp
index 8e3e0dab..0d5362e7 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -526,23 +526,36 @@ bool think(const Position& pos, bool infinite, bool ponder, int side_to_move,
               << " moves to go: " << movesToGo << std::endl;
 
 
-  // We're ready to start thinking. Call the iterative deepening loop function
-  //
-  // FIXME we really need to cleanup all this LSN ugliness
-  if (!loseOnTime)
+  // LSN filtering. Used only for developing purpose. Disabled by default.
+  if (   UseLSNFiltering
+      && loseOnTime)
   {
-      Value v = id_loop(pos, searchMoves);
-      loseOnTime = (   UseLSNFiltering
-                    && myTime < LSNTime
-                    && myIncrement == 0
-                    && v < -LSNValue);
+      // Step 2. If after last move we decided to lose on time, do it now!
+       while (SearchStartTime + myTime + 1000 > get_system_time())
+           ; // wait here
   }
-  else
+
+  // We're ready to start thinking. Call the iterative deepening loop function
+  Value v = id_loop(pos, searchMoves);
+
+  // LSN filtering. Used only for developing purpose. Disabled by default.
+  if (UseLSNFiltering)
   {
-      loseOnTime = false; // reset for next match
-      while (SearchStartTime + myTime + 1000 > get_system_time())
-          ; // wait here
-      id_loop(pos, searchMoves); // to fail gracefully
+      // Step 1. If this is sudden death game and our position is hopeless,
+      // decide to lose on time.
+      if (   !loseOnTime // If we already lost on time, go to step 3.
+          && myTime < LSNTime
+          && myIncrement == 0
+          && movesToGo == 0
+          && v < -LSNValue)
+      {
+          loseOnTime = true;
+      }
+      else if (loseOnTime)
+      {
+          // Step 3. Now after stepping over the time limit, reset flag for next match.
+          loseOnTime = false;
+      }
   }
 
   if (UseLogFile)