X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fbook.cpp;h=cc557e4800aac7126ed74ccdb1cf33c29ba9436c;hb=d11a52990459601e46e02a8759616737dc045f74;hp=1baafbbaabb618f87c2b425a09f3a844fcf3f182;hpb=161c6b025e763d6bcc8339a614be312f2b173437;p=stockfish

diff --git a/src/book.cpp b/src/book.cpp
index 1baafbba..cc557e48 100644
--- a/src/book.cpp
+++ b/src/book.cpp
@@ -315,7 +315,7 @@ namespace {
   uint64_t book_key(const Position& pos) {
 
     uint64_t key = 0;
-    Bitboard b = pos.occupied_squares();
+    Bitboard b = pos.pieces();
 
     while (b)
     {