From: Ralph Stößer <ralph.stoesser@ralph_stoesser.(none)>
Date: Sun, 22 Dec 2013 11:00:09 +0000 (+0100)
Subject: Loosened trigger condition for king safety
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=899a2c033e2e74d3da97c7aefff74fb05a59db0a

Loosened trigger condition for king safety

Reduce eval discontinuity becuase now we kick in
king safety evaluation in many more cases.

Passed both short TC:
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 8708 W: 1742 L: 1613 D: 5353

And long TC:
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 6743 W: 1122 L: 990 D: 4631

bench: 6835416
---

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 72c23f19..d3190bfc 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -640,8 +640,7 @@ Value do_evaluate(const Position& pos) {
     Score score = ei.pi->king_safety<Us>(pos, ksq);
 
     // Main king safety evaluation
-    if (   ei.kingAttackersCount[Them] >= 2
-        && ei.kingAdjacentZoneAttacksCount[Them])
+    if (ei.kingAttackersCount[Them])
     {
         // Find the attacked squares around the king which have no defenders
         // apart from the king itself