門前 もんぜん きよし自摸 つも でしょう
monzen kiyoshitsumowadeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 門前清自摸和

1. Probably winning by oneself.; Probably a clean win.

Polite
Presumptive
Conjecture
Mahjong