The competition standard used at international tournaments — 81 scoring patterns, the eight-point minimum for a winning hand, and the full set of eight flower tiles.
From the largest hands down to the smallest, every pattern in the international standard is recognised.
You cannot declare a win below eight points, which is what gives MCR its distinctive tension.
The four seasons and four noble plants are included, as in the official set.
Mahjong Competition Rules — the standardised Chinese ruleset used officially at international tournaments.
There is no riichi and no dora. Instead you add up 81 scoring patterns and must reach eight points to win. Eight flower tiles are also in play.
Yes. MCR supports four-player online rooms with friends, using the same official profile as solo play.