fix

field.cpp

@@ -575,7 +575,7 @@ int32 field::get_useable_count_fromex(card* pcard, uint8 playerid, uint8 uplayer
 	else
 	{
 		useable_count = get_useable_count_other(pcard, playerid, LOCATION_MZONE, uplayer, LOCATION_REASON_TOFIELD, zone, list);
-		if(is_player_affected_by_effect(playerid, EFFECT_EXTRA_TOMAIN_KOISHI) || pcard->is_affected_by_effect(EFFECT_EXTRA_TOMAIN_KOISHI)) {
+		if(core.duel_rule >= 4) {
 			uint32 temp_list = 0;
 			get_useable_count_fromex_rule4(pcard, playerid, uplayer, zone, &temp_list);
 			if(~temp_list & ((1u << 5) | (1u << 6)))