From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Wed, 16 Sep 2020 20:13:01 +0000 (+0200)
Subject: Revise palace attacks for rook
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=eeef42f9dfc73b15e0e110fffa6bdcdd00dacc9b;p=fairystockfish.git

Revise palace attacks for rook

janggi
Total: 500 W: 268 L: 221 D: 11
---

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index f91626f..6d01a5a 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -303,7 +303,7 @@ namespace {
     {
         // Find attacked squares, including x-ray attacks for bishops and rooks
         b = Pt == BISHOP ? attacks_bb<BISHOP>(s, pos.pieces() ^ pos.pieces(QUEEN))
-          : Pt ==   ROOK ? attacks_bb<  ROOK>(s, pos.pieces() ^ pos.pieces(QUEEN) ^ pos.pieces(Us, ROOK))
+          : Pt ==   ROOK && !pos.diagonal_lines() ? attacks_bb<  ROOK>(s, pos.pieces() ^ pos.pieces(QUEEN) ^ pos.pieces(Us, ROOK))
                          : pos.attacks_from(Us, Pt, s);
 
         // Restrict mobility to actual squares of board