X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=668fd0955687523cd8d8779dccb1c65aea64e6fb;hp=0d1a401c6b715c489426047e308e60490fea203c;hb=b917cd275e6f9825bc860d2fc7b7d67dacef2915;hpb=7b0a2f2a90b63d9e5e092786fbfb54cd8ad3d8e5

diff --git a/src/search.cpp b/src/search.cpp
index 0d1a401c..668fd095 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -43,7 +43,7 @@ namespace Search {
   std::vector<RootMove> RootMoves;
   Position RootPos;
   Color RootColor;
-  Time::point SearchTime, IterationTime;
+  Time::point SearchTime;
   StateStackPtr SetupStates;
 }
 
@@ -206,10 +206,10 @@ void Search::think() {
       }
   }
 
-  if (Options["Contempt Factor"] && !Options["UCI_AnalyseMode"])
+  if (!Options["UCI_AnalyseMode"])
   {
-      int cf = Options["Contempt Factor"] * PawnValueMg / 100; // From centipawns
-      cf = cf * Material::game_phase(RootPos) / PHASE_MIDGAME; // Scale down with phase
+      // Dynamic draw value: try to avoid repetition draws at early midgame
+      int cf = std::max(70 - RootPos.game_ply(), 0);
       DrawValue[ RootColor] = VALUE_DRAW - Value(cf);
       DrawValue[~RootColor] = VALUE_DRAW + Value(cf);
   }
@@ -397,7 +397,7 @@ namespace {
                 sync_cout << uci_pv(pos, depth, alpha, beta) << sync_endl;
         }
 
-        IterationTime = Time::now() - SearchTime;
+        Time::point iterationTime = Time::now() - SearchTime;
 
         // If skill levels are enabled and time is up, pick a sub-optimal best move
         if (skill.enabled() && skill.time_to_pick(depth))
@@ -432,7 +432,7 @@ namespace {
             // Stop the search if only one legal move is available or all
             // of the available time has been used.
             if (   RootMoves.size() == 1
-                || IterationTime > TimeMgr.available_time() )
+                || iterationTime > TimeMgr.available_time() )
                 stop = true;
 
             if (stop)
@@ -668,7 +668,7 @@ namespace {
         && !ss->skipNullMove
         &&  abs(beta) < VALUE_MATE_IN_MAX_PLY)
     {
-        Value rbeta = beta + 200;
+        Value rbeta = std::min(beta + 200, VALUE_INFINITE);
         Depth rdepth = depth - ONE_PLY - 3 * ONE_PLY;
 
         assert(rdepth >= ONE_PLY);
@@ -1627,8 +1627,7 @@ void check_time() {
   Time::point elapsed = Time::now() - SearchTime;
   bool stillAtFirstMove =    Signals.firstRootMove
                          && !Signals.failedLowAtRoot
-                         &&  elapsed > TimeMgr.available_time()
-                         &&  elapsed > IterationTime * 1.4;
+                         &&  elapsed > TimeMgr.available_time() * 75 / 100;
 
   bool noMoreTime =   elapsed > TimeMgr.maximum_time() - 2 * TimerThread::Resolution
                    || stillAtFirstMove;