--- gnuchess-5.06/src/book.h.bp	2003-05-05 15:51:52.000000000 +0200
+++ gnuchess-5.06/src/book.h	2003-05-05 15:52:19.000000000 +0200
@@ -31,6 +31,7 @@
  */
 static char const * bookbin[] = {
    "book.dat",
+   "/var/lib/games/gnuchess/book.dat",
    "/usr/share/games/gnuchess/book.dat",
    "/usr/lib/games/gnuchess/book.dat",
    NULL