Remove previousScore adjustment of delta.

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index c5a7582ce4d1ccea45a67804983c3fde992bc3dc..f866afe5ce7b887747e80da04e79c6593a8713f2 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -433,7 +433,7 @@ void Thread::search() {
           if (rootDepth >= 4)
           {
               Value previousScore = rootMoves[pvIdx].previousScore;
-              delta = Value(21 + abs(previousScore) / 256);
+              delta = Value(21);
               alpha = std::max(previousScore - delta,-VALUE_INFINITE);
               beta  = std::min(previousScore + delta, VALUE_INFINITE);