Disable probcut for clobber

clobber
ELO: 32.05 +-21.6 (95%) LOS: 99.8%
Total: 1000 W: 546 L: 454 D: 0

diff --git a/src/search.cpp b/src/search.cpp
index 02fb029..0439919 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -805,6 +805,7 @@ namespace {
     // much above beta, we can (almost) safely prune the previous move.
     if (   !PvNode
         &&  depth >= 5 * ONE_PLY
+        &&  (pos.pieces() ^ pos.pieces(CLOBBER_PIECE))
         &&  abs(beta) < VALUE_MATE_IN_MAX_PLY)
     {
         Value rbeta = std::min(beta + 216 * (1 + !!pos.max_check_count() + (pos.extinction_value() != VALUE_NONE)) - 48 * improving, VALUE_INFINITE);