Hopefully there are some people still around, as I could use some hint here.
I recently started to play mahjong, and for now prefer to stay offline. But in my last game I got a situation I cannot understand (pic attached).
Previous move, N discards 6 pins, so I was expecting to ron and be done with it. But system only allowed me to pon. Why exactly? With 6 pin from what I understand I should have a winning hand, 2,3,4 pin form earlier chi, 1,2,3 pin and 3x6 sou on hand, 3x6 pin from discard and 2x3 pin as paid. 4 melds and a pair.
So, what am I missing?