Restore LMR depth limit

It is not clear the advantage and we don't want
to risk of introducing regressions on this
very critical parameter. So revert to old limit.

After 16003 games
Mod vs Orig 2496 - 2421 - 11086 ELO +1 (+-3)

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

diff --git a/src/search.cpp b/src/search.cpp
index f0bbf0fdecd013362a81f5037cb8d539e8c0495e..6f3d6df2fcfb65e690c3a585ad2100ba003c3bcd 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -970,7 +970,7 @@ split_point_start: // At split points actual search starts from here
 
       // Step 15. Reduced depth search (LMR). If the move fails high will be
       // re-searched at full depth.
-      if (   depth > 4 * ONE_PLY
+      if (   depth > 3 * ONE_PLY
           && !isPvMove
           && !captureOrPromotion
           && !dangerous