crossbow:: checkmate rule

checkmove.cpp

@@ -338,6 +338,8 @@ EX void checkmove() {
     }
 #endif
 
+  if(!canmove && bow::crossbow_mode()) canmove = bow::have_bow_target();
+
   if(!canmove) {
     achievement_final(true);
     if(cmode & sm::NORMAL) showMissionScreen();