diff -ur chess-2.0b5.orig/chess-maint.el chess-2.0b5/chess-maint.el
--- chess-2.0b5.orig/chess-maint.el	2004-02-24 05:43:42.000000000 -0600
+++ chess-2.0b5/chess-maint.el	2005-06-30 11:10:05.000000000 -0500
@@ -4,10 +4,21 @@
 (require 'chess)
 (require 'chess-pgn)
 
+;; (defmacro assert (form)
+;;   ;; byte-compiling-files-p not available in Emacs 22
+;;   (if (< emacs-major-version 22)
+;;       (unless  (byte-compiling-files-p)
+;; 	`(unless ,form
+;; 	   (error "Assertion failed: %s" (pp-to-string ,form))))
+;;     `(unless ,form
+;;        (error "Assertion failed: %s" (pp-to-string ,form)))))
+
+;; (defmacro assert (form)
+;;   `(unless ,form
+;;      (error "Assertion failed: %s" (pp-to-string ,form))))
+
 (defmacro assert (form)
-  (unless (byte-compiling-files-p)
-    `(unless ,form
-       (error "Assertion failed: %s" (pp-to-string ,form)))))
+  t)
 
 (defun chess-generate-texinfo-file ()
   (require 'lispdoc)