Support for both mr4 and mr3 field

field.cpp

@@ -153,6 +153,7 @@ void field::reload_field_info() {
 		pduel->write_buffer8(chit->triggering_sequence);
 		pduel->write_buffer32(peffect->description);
 	}
+	pduel->write_buffer8(core.duel_rule - 1);
 }
 // The core of moving cards, and Debug.AddCard() will call this function directly.
 // check Fusion/S/X monster redirection by the rule, set fieldid_r

ocgapi.cpp

@@ -340,6 +340,7 @@ extern "C" DECL_DLLEXPORT int32 query_field_info(ptr pduel, byte* buf) {
 		*((int*)(buf)) = peffect->description;
 		buf += 4;
 	}
+	*buf++ = ptduel->game_field->core.duel_rule;
 	return 0;
 }
 extern "C" DECL_DLLEXPORT void set_responsei(ptr pduel, int32 value) {