RULES

Siamese differences

Two players, two racks each, no Charleston. Build two hands using one shared supply of hidden tiles per player.

Two players, two racks each. Build two winning hands.
Start with 27 tiles each. East draws a 28th, then discards. There is no Charleston.
Before your first mahjong, count 27 tiles between turns and 28 before discarding. No replacement draw follows a kong.
Hidden tiles can move between your racks. Exposures stay on the rack you choose when calling.
Only your opponent can answer a discard.

You may use jokers in an exposure to save natural tiles for your other hand.
Choosing hands that need different tiles is a strategy, not a requirement.
Declare your first 14-tile hand, discard, and keep playing with 13 active tiles.
Declared tiles stay fixed, and their jokers cannot be exchanged. Waiting to declare keeps them available but risks the game ending first.
You also cannot exchange a joker from the exposure that made a rack dead.

One dead rack leaves the other in play. One declared hand plus one dead rack leaves you with no active hand.
The game ends on a second mahjong, both racks dead for one player, or a wall game.
Your first mahjong pays its card value. Your second pays double.
An eligible jokerless hand doubles again. Declaring both mahjongs in one turn doubles both payments again. There is no self-pick bonus.
Both racks dead costs a flat 100 points.
Giving your opponent their second mahjong costs 25 points. This includes a discard that completes the first of two hands declared together.
A wall game pays each player 10 points. A first mahjong already declared is still paid.
A double-mahjong claim takes priority in a tie.

These lessons use the Learner card.

Teaches on the Learner card · reviewed 2026-09-14