Staring down the dragons

(alternative title: scaring away the new readers) Like a moth to a flame, I keep being drawn to sanma , three-player Japanese mahjong. I know that it's bad for me, but the temptation is that it's quick. A normal four-player game takes half an hour or longer; sanma can be over in five minutes, and sometimes much quicker than that. The downside is that it's insane. I don't know how it's logically…