In “game information” menu it’s possible to see which rules are used in this game (Chinese, Japanese, …)
But, no one use this menu. Everyone assume it’s Japanese rules.
In this game opponent passed instead of D6. Obviously because he didn’t know it’s Chinese rules. So I didn’t play in D6 to not steal victory.
Please, display ruleset in game on visible place, so everyone will know instantly which rules are used.