X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=33ab6b5fdc71618407a16267ab342556ed63ca98;hp=3bcb7ef3b7e7662d12e0af6ad556275ad4bf6962;hb=328d314f2faa128f6bed32e334190cdaed62d9bc;hpb=ecc5ff6693f116f4a8ae5f5080252f29b279c0a1

diff --git a/src/search.cpp b/src/search.cpp
index 3bcb7ef3..33ab6b5f 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -64,7 +64,7 @@ namespace {
   enum NodeType { Root, PV, NonPV };
 
   // Razoring and futility margin based on depth
-  Value razor_margin(Depth d) { return Value(512 + 32 * d); }
+  int razor_margin[4] = {483, 570, 603, 554};
   Value futility_margin(Depth d) { return Value(200 * d); }
 
   // Futility and reductions lookup tables, initialized at startup
@@ -149,7 +149,7 @@ namespace {
 
 void Search::init() {
 
-  const double K[][2] = {{ 0.83, 2.25 }, { 0.50, 3.00 }};
+  const double K[][2] = {{ 0.799, 2.281 }, { 0.484, 3.023 }};
 
   for (int pv = 0; pv <= 1; ++pv)
       for (int imp = 0; imp <= 1; ++imp)
@@ -393,7 +393,7 @@ void Thread::search(bool isMainThread) {
           // Reset aspiration window starting size
           if (depth >= 5 * ONE_PLY)
           {
-              delta = Value(16);
+              delta = Value(18);
               alpha = std::max(rootMoves[PVIdx].previousScore - delta,-VALUE_INFINITE);
               beta  = std::min(rootMoves[PVIdx].previousScore + delta, VALUE_INFINITE);
           }
@@ -453,7 +453,7 @@ void Thread::search(bool isMainThread) {
               else
                   break;
 
-              delta += delta / 2;
+              delta += delta / 4 + 5;
 
               assert(alpha >= -VALUE_INFINITE && beta <= VALUE_INFINITE);
           }
@@ -690,14 +690,14 @@ namespace {
     // Step 6. Razoring (skipped when in check)
     if (   !PvNode
         &&  depth < 4 * ONE_PLY
-        &&  eval + razor_margin(depth) <= alpha
+        &&  eval + razor_margin[depth] <= alpha
         &&  ttMove == MOVE_NONE)
     {
         if (   depth <= ONE_PLY
-            && eval + razor_margin(3 * ONE_PLY) <= alpha)
+            && eval + razor_margin[3 * ONE_PLY] <= alpha)
             return qsearch<NonPV, false>(pos, ss, alpha, beta, DEPTH_ZERO);
 
-        Value ralpha = alpha - razor_margin(depth);
+        Value ralpha = alpha - razor_margin[depth];
         Value v = qsearch<NonPV, false>(pos, ss, ralpha, ralpha+1, DEPTH_ZERO);
         if (v <= ralpha)
             return v;