From: ianfab <ianfab@users.noreply.github.com>
Date: Mon, 13 Aug 2018 19:28:44 +0000 (+0200)
Subject: Tweak bonus for racing kings
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=bfaf93dccb7a35c308f0d7d017b6db3f1c5deccf;p=fairystockfish.git

Tweak bonus for racing kings

racing kings STC
LLR: 2.96 (-2.94,2.94) [0.00,10.00]
Total: 469 W: 262 L: 162 D: 45
http://35.161.250.236:6543/tests/view/5b71dcbb6e23db0fbab0dca0
---

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 4333e24..b9ffc8d 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -815,7 +815,7 @@ namespace {
             int dist =  distance(pos.square<KING>(Us), s)
                       + popcount(pos.attackers_to(s) & pos.pieces(Them))
                       + !!(pos.pieces(Us) & s);
-            score += make_score(3000, 3000) / (1 + dist * dist);
+            score += make_score(3000, 3000) / (1 + dist * (pos.checking_permitted() ? dist : 1));
         }
     }