diff -u beasts-orig/beast.c beasts/beast.c
--- beasts-orig/beast.c	Mon Jul 27 22:36:59 1998
+++ beasts/beast.c	Sat Mar 11 11:05:59 2000
@@ -147,6 +147,8 @@
   float x_to_y;
   gboolean go_XY, YX_Failed = FALSE, XY_Failed=FALSE, Trapped=FALSE;
 
+  if (beast[bnum].lastmoved == turnnum)
+    return ;
   beast[bnum].lastmoved = turnnum;
 
   deltax=hero->x - beast[bnum].x;