From: Marco Costalba <mcostalba@gmail.com>
Date: Fri, 9 Aug 2013 06:21:55 +0000 (+0200)
Subject: Fix 'improving' condition
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=5769509d72ab59d1a1856d035c38d84ecdc6f687;hp=fff6b9f0614243a14c7ba6aa8c846d8d4025d3a6

Fix 'improving' condition

Because VALUE_NONE is 30002, it happens that
after a check the next move is never an improving
one.

After this patch bench signature is independent from
VALUE_NONE actual value.

bench: 4303194
---

diff --git a/src/search.cpp b/src/search.cpp
index bba0cb65..9143f669 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -775,7 +775,10 @@ moves_loop: // When in check and at SpNode search starts from here
     MovePicker mp(pos, ttMove, depth, History, countermoves, ss);
     CheckInfo ci(pos);
     value = bestValue; // Workaround a bogus 'uninitialized' warning under gcc
-    improving = ss->staticEval >= (ss-2)->staticEval;
+    improving =   ss->staticEval >= (ss-2)->staticEval
+               || ss->staticEval == VALUE_NONE
+               ||(ss-2)->staticEval == VALUE_NONE;
+
     singularExtensionNode =   !RootNode
                            && !SpNode
                            &&  depth >= (PvNode ? 6 * ONE_PLY : 8 * ONE_PLY)