Winning (hu) is reached when, after taking a discard or drawing, the fourteen tiles form a complete structure as prescribed and the hand scores eight or more points (3.4.22); Self-drawn — winning on a fresh tile taken from the wall (3.4.23); A hand that reaches neither a declaration nor a winner ...
Why people argue about this
People often assume that winning in Mahjong MCR (WMO) means having a complete hand without needing to take tiles from the wall, but actually, it's about reaching either a declaration or a winner, which can be achieved by taking tiles off the wall and forming a complete set of 14 tiles.
