Simplify reduction formula #2122

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index f021f8ff5eb183517a9391bd6cff6faee74d571c..0e9674a05cc6bad59c7f4089edf8ac3f73301dab 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -149,7 +149,7 @@ namespace {
 void Search::init() {
 
   for (int i = 1; i < MAX_MOVES; ++i)
-      Reductions[i] = int(1024 * std::log(i) / std::sqrt(1.95));
+     Reductions[i] = int(733.3 * std::log(i));
 }
 
 
@@ -241,10 +241,8 @@ void MainThread::search() {
 
       // Vote according to score and depth
       for (Thread* th : Threads)
-      {
-          int64_t s = th->rootMoves[0].score - minScore + 1;
-          votes[th->rootMoves[0].pv[0]] += 200 + s * s * int(th->completedDepth);
-      }
+          votes[th->rootMoves[0].pv[0]] +=
+               (th->rootMoves[0].score - minScore + 14) * int(th->completedDepth);
 
       // Select best thread
       auto bestVote = votes[this->rootMoves[0].pv[0]];