From fe07ae4cb4c2553fb48cab44c502ba766d1f09ce Mon Sep 17 00:00:00 2001
From: mstembera <MissingEmail@email>
Date: Wed, 26 Nov 2014 07:56:48 +0800
Subject: [PATCH] Bitbase index() from ADD to OR.

No functional change.

Resolves #132
---
 src/bitbase.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/bitbase.cpp b/src/bitbase.cpp
index 000ed7a5..e7638cd8 100644
--- a/src/bitbase.cpp
+++ b/src/bitbase.cpp
@@ -41,7 +41,7 @@ namespace {
   // bit 13-14: white pawn file (from FILE_A to FILE_D)
   // bit 15-17: white pawn RANK_7 - rank (from RANK_7 - RANK_7 to RANK_7 - RANK_2)
   unsigned index(Color us, Square bksq, Square wksq, Square psq) {
-    return wksq + (bksq << 6) + (us << 12) + (file_of(psq) << 13) + ((RANK_7 - rank_of(psq)) << 15);
+    return wksq | (bksq << 6) | (us << 12) | (file_of(psq) << 13) | ((RANK_7 - rank_of(psq)) << 15);
   }
 
   enum Result {
-- 
2.39.2