The Shape of a Turn
Draw one, discard one
You know what the tiles are and what a winning hand looks like.
Now: how does a hand actually run?
It is simpler than it looks. Every turn is the same two steps.
YOUR HAND IS 13 TILES
You are dealt 13. You hold 13 between turns. Always.
ON YOUR TURN
1. DRAW one tile. Now you have 14.
2. DISCARD one tile. Back to 13.
That's the whole loop. Draw to 14, discard to 13, pass it on.
The 14th tile is the interesting one. For a moment you are holding a complete hand — and if those 14 tiles form four sets and a pair, you may be able to win instead of discarding.
"May" is doing real work there. This ruleset also enforces a MINIMUM FAAN: a hand has to be worth a certain amount to be declared at all. A complete shape that is worth too little cannot be won on, and you keep playing. Level 4 covers what earns fan.
That is the only reason the count matters: 14 is the shape of a finished hand, 13 is a hand waiting for one.
PLAY PASSES TO YOUR RIGHT
After you discard, the turn moves to the next seat and goes around the table the same direction all game.
Nothing here is a decision yet. The decisions start when someone discards a tile you want — which is the rest of this level.