Kawa

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Kawa 「河」 (lit. "river", sometimes referred to as the "pond"), or discard pile, is where discarded tiles are placed. It helps provide players with information regarding other players' hands. For defensive play, players rely on the discards to determine safe tiles. It can also be used to determine probable hands of other players, especially when particular yaku are sought for.

In most non-Japanese variants of mahjong, discarded tiles are simply placed in a disorganized pile at the center of the playing area. However, for Japanese mahjong, each player is in charge of maintaining one's own discard pile. It is customary to arrange discards in rows of six, though this is not required for casual play.

Furiten

The furiten rule is the primary reason for the arranged discards. Without this rule, then theoretically, Japanese mahjong would not require arranged discards. The arranged discards helps maintain a record of player discards, which makes the enforcement of furiten possible.

Discard reading

The arranged discards provide players with a wealth of information regarding the state of the hand, as well as the game.

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