/jp/ - Otaku Culture

>>19482275
And for reference, here's the bit on urasuji from the new edition of Oshiete! Kagaku-suru Maajan. Here he notes that a discarded 2 means a 33 shanpon is also unlikely.

I've also got another book on discard reading from the JPML. Not sure how credible it is or whether it's backed by stats, and I don't have it on me right now so I can't take a picture, but it says that urasuji of a riichi tile is safe(r) because it would suggest that someone was already in tenpai with a kanchan and didn't riichi until they drew into a ryanmen. That might happen often in joukyuu, if you have a bad shape wait such as a kanchan or penchan and at least one other han (such as dora), recent digital strategy says you should riichi right away because your EV is higher than if you stay dama.