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Playing with hot and cold walls are consider table rules and not sanctioned by the National Mah Jongg League.
Category - Rules
Protocols, regulations, etc.
A commitment to a called tile occurs when a player either exposes tiles on the flat part of their rack, placed the called tile on the flat part of their rack or placed the called tile on the sloping part of their rack along with their other tiles.
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It is every player's responsibility to verify they’ve made a correct exposure.
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A player calls a discarded tile while another player simultaneously racks the tile they picked; the player who called the discarded tile is entitled to it.
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Once a player names or discards a tile he cannot change his mind and discard a different tile.
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When two players simultaneously call the same tile for mah jongg, the player next in turn gets the tile.
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When a player calls a tile and places it on the flat part of their rack or exposes tiles from their rack, they are committed to taking that discard.
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When two players call the same tile, the player next in turn gets the tile.
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A tile is discarded and misnamed, and two players call for mah jongg
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When two players verbalize a call for the same discard, the player next has the first right of refusal unless the other player has also exposed tiles.
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