From: ianfab <ianfab@users.noreply.github.com>
Date: Tue, 24 Jul 2018 20:27:05 +0000 (+0200)
Subject: Fix relative_rank for maximum rank != 2^n
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=15272e79f5ef0bf8aaf2805e0b44fc7b31b5e697;p=fairystockfish.git

Fix relative_rank for maximum rank != 2^n

No functional change for 8x8 boards.
---

diff --git a/src/types.h b/src/types.h
index f127211..aac7022 100644
--- a/src/types.h
+++ b/src/types.h
@@ -447,7 +447,7 @@ constexpr Square relative_square(Color c, Square s) {
 }
 
 constexpr Rank relative_rank(Color c, Rank r, Rank maxRank = RANK_8) {
-  return Rank(r ^ (c * maxRank));
+  return Rank(c == WHITE ? r : maxRank - r);
 }
 
 constexpr Rank relative_rank(Color c, Square s, Rank maxRank = RANK_8) {