Yaku cheatsheet:

For the purposes of yaku, quads generally count as triplets.

== Situational (closed only) ==
Riichi		Declare that you are in tenpai, wager 1000 and discard every non-winning  tile you draw
Double riichi	Call riichi on your starting hand (worth 2 han)
Ippatsu		Winning via ron before your next draw, or by tsumo on your next draw; must not be interrupted by calls
Pinfu		Winning hand contains only sequences and a pair; must win on an open wait; must not have a yakuhai pair

== Situational (may be open) ==
Menzen tsumo	Completing a closed hand by self-draw
Haitei raoyue	Completing a hand with the final tile on the wall
Houtei raoyui	Completing a hand with the final discard
Rinshan kaihou	Completing a hand with a tile from the dead wall after calling kan
Chankan		Completing a hand via another player's open kan (if the kanned tile is your wait, you may call it to win)

== 1 han ==
Iipeikou	Two of the same sequence in one suit (closed only)
Tanyao		No terminals or honors (may be open)
Yakuhai		Triplet of any dragon, seat or round wind (may be open, stacks, seat=round wind is worth 2 han)

== 2 han ==
Toitoi		Four triplets and a pair (may be open)
Ittsu		123-456-789 in a single suit (only 1 han if open)
Sanshoku	The same sequence in three suits (only 1 han if open)
Chanta		All tile groups contain a terminal or honor (only 1 han if open)
Sanankou	Three of your tile groups are closeed triplets (may be open)
Sankantsu	Three kans (may be open)
Chiitoitsu	Seven pairs (closed only, duh)
Honroutou	All tile groups ONLY contain terminals or honors (may be open, implies toitoi or chiitoitsu so 4 han)
Shousangen	Two triplets of dragons and a pair of the third dragon (may be open, implies 2x yakuhai, so 4 han)

== 3 han ==
Honitsu		Single suit hand with honor tiles (only 2 han if open)
Junchan		All sets contain at least one terminal (only 2 han if open)
Ryanpeikou	Two of the same sequence in two suits (closed only, does not combine with chiitoitsu)

== 6 han ==
Chinitsu	Single suit hand (only 5 han if open)

== Yakuman ==
Kazoe yakuman	Hand contains 13+ han
Kokushi musou	One of every terminal and honor, plus one extra terminal or honor (thirteen orphans)
Suuankou	Four closed triplets; if completed by ron it must be a pair wait, otherwise it would count as opening a triplet
Daisangen	Three triplets of dragon tiles (big three dragons)
Shousuushi	Three triplets of winds plus a pair of the fourth (little four winds)
Daisuushi	Four triplets of all four winds (big four winds)
Tsuuiisou	Only honor tiles
Chinroutou	Only terminals
Ryuuiisou	Only 2, 3, 4, 6, 8 Sou and/or Hatsu (all green)
Chuuren poutou  1112345678999 of the same suit, scoring depends on tenpai and winning tile (nine gates)
Tenhou		The dealer is dealt a winning hand (hand of heaven)
Chiihou		The non-dealer draws a winning tile on their first draw; must not be interrupted by calls (hand of earth)


Fu cheatsheet:

Base: 20
			Open	Closed
Sequence: +0
Simple Triplet: 	+2	+4
Honor/Terminal: 	+4	+8
Simple Quad:		+8	+16
Honor/Terminal:		+16	+32

Open wait: +0
Closed, Edge or Pair wait: +2
Yakuhai pair: +2
Closed ron: +10
Tsumo: +2

Rounded up to nearest 10 except for chiitoitsu which is fixed at 25