From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Thu, 20 Jun 2019 12:29:22 +0000 (+0200)
Subject: Increase king tropism for drop games
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=228d63e308bb3c4181051a2039059605573170a3;p=fairystockfish.git

Increase king tropism for drop games

crazyhouse STC
LLR: 2.96 (-2.94,2.94) [0.00,10.00]
Total: 1287 W: 688 L: 569 D: 30
http://35.161.250.236:6543/tests/view/5d0b7c646e23db34f4206c03

crazyhouse LTC
LLR: 2.95 (-2.94,2.94) [0.00,10.00]
Total: 982 W: 536 L: 422 D: 24
http://35.161.250.236:6543/tests/view/5d0bc5fb6e23db34f4206c0e
---

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 4865e96..1c3bf37 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -568,7 +568,7 @@ namespace {
         score -= PawnlessFlank;
 
     // King tropism bonus, to anticipate slow motion attacks on our king
-    score -= FlankAttacks * kingFlankAttacks * (1 + pos.captures_to_hand() + !!pos.max_check_count());
+    score -= FlankAttacks * kingFlankAttacks * (1 + 3 * pos.captures_to_hand() + !!pos.max_check_count());
 
     // For drop games, king danger is independent of game phase
     if (pos.captures_to_hand())