
When to meld is something I'm trying to learn, and in my last game there was a situation I thought about posting it here:
It's very early in the game: I don't have a great hand (3-shanten after melding, with lots of lone tiles) and melding would decrease my defensive chances; on the other hand, if I'm able to win quickly shimocha wouldn't be East anymore (which is good, since it's second and I don't want him to have continuance, but he wouldn't be east also if someone else won), I would increase my very small lead on him and would be in all last in first place. If I don't meld, I can hope to draw (or meld later, with a better hand) the fourth

(I didn't meld, the fourth dragon didn't come out, the hand ended in a draw with kimocha getting 3000.)