This is the category page for the riichi mahjong articles.
“Yaku are hand patterns and/or luck situations in rīchi mahjong. To win a hand, besides it being...Mahjong yaku
“Waits are tiles a player does not possess in the hand, but they are wanted tiles either by draw...Mahjong waits
“Kan has some special rules applied to it. A kan is a quad, which is four tiles of the same kind...Kan
“In addition to the standard rules to Japanese mahjong, additional "house rules" and variations...Optional rules