>>14287357You should generally assume tenpai when:
- first row of discards with three calls
- second row with two calls
- third row with one call
Aside from that, watch out for when people discard tiles from inside their hand. Usually those areas are the most dangerous in the mid-late game. If you're aware of how many tiles in those areas you can see on the table, then you can narrow down the likely shapes that the player discarded that tile from.
