What is the reasoning beyond Kuikae (喰い替え) rule in riichi mahjong?
What exactly are the situations that this rule prevents?
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Kuikae prevents the following:
Standard penalty for breaking this rule is a dead hand, in most competitive leagues as well as in jansô environments.
EDIT: For those reading, we talk about kuikae, but in the sense the the rule is a restriction on what can legally be done (making these cases illegal moves), so an OFF setting, as opposed to an ON setting. Kind of like the kô snapback ban in go, or rules relating to repeated positions in chess/shôgi.