Revert "Further push singular extension"

This reverts commit 4c91dbc28e8bb6265f8

Seems a regression on extended test by both Gary and me.

diff --git a/src/search.cpp b/src/search.cpp
index 35d1eb5..cfc1573 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -835,7 +835,7 @@ split_point_start: // At split points actual search starts from here
           ss->excludedMove = MOVE_NONE;
 
           if (value < rBeta)
-              ext = rBeta >= beta ? ONE_PLY + ONE_PLY / 2 : ONE_PLY;
+              ext = ONE_PLY;
       }
 
       // Update current move (this must be done after singular extension search)