Can a Joker Be Used for a Pair in American Mahjong?
No — a Joker can never stand in for a pair or a single tile. Here's exactly where Jokers can and can't go in American Mahjong, plus how the Joker swap works.
Short answer: no. In American Mahjong, a Joker can never be used for a pair or a single tile. Jokers only substitute inside a group of three or more identical tiles.
Where a Joker can go
A Joker can stand in for any tile in a group of three or more of the same tile:
- Pung — three identical tiles
- Kong — four identical tiles
- Quint — five identical tiles
Where a Joker can't go
Jokers are off-limits anywhere a hand calls for one or two specific tiles:
- Pairs — the two-tile groups in any hand (a pair must be two real, matching tiles)
- Singles — any single tile, including the NEWS and Year singles in Singles & Pairs hands
The Joker swap
On your turn, before you discard, you can exchange a real tile for a Joker sitting in any player's exposed group — including your own. The real tile takes the Joker's place in the exposure, and the Joker joins your concealed hand. The Joker has to be in an exposed group — never one still hidden in a concealed hand — and only Jokers can be swapped, never real tiles.
One more thing: you can discard a Joker, but no one can call it off the discard — a discarded Joker is dead for good; no one can ever claim it.