From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Sun, 10 Nov 2019 16:07:43 +0000 (+0100)
Subject: Fix attackers calculation for xiangqi generals
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=2280b46616702e07cfd06eae205c1a80fda9d2aa;p=fairystockfish.git

Fix attackers calculation for xiangqi generals

xiangqi
LLR: 1.77 (-2.94,2.94) [0.00,10.00]
Total: 1000 W: 330 L: 274 D: 396
---

diff --git a/src/position.cpp b/src/position.cpp
index 7e86ba8..5dd265d 100644
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -774,6 +774,9 @@ Bitboard Position::attackers_to(Square s, Bitboard occupied, Color c) const {
           b |= pieces(c, FERS) & gates(c) & fers_sq;
   }
 
+  if (var->xiangqiGeneral)
+      b ^= b & pieces(KING) & ~PseudoAttacks[~c][WAZIR][s];
+
   return b;
 }