Remove pruning condition on alpha

Further simplifying on Lucas's idea, seems reliable
in tests:

ELO: 2.15 +-7 (95%) LOS: 84.9%
Total: 9999 W: 1831 L: 1769 D: 6399

diff --git a/src/search.cpp b/src/search.cpp
index c039b64..b235a1e 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -860,8 +860,7 @@ split_point_start: // At split points actual search starts from here
       if (   !captureOrPromotion
           && !inCheck
           && !dangerous
-          &&  move != ttMove
-          &&  alpha > VALUE_MATED_IN_MAX_PLY)
+          &&  move != ttMove)
       {
           // Move count based pruning
           if (   !PvNode