round summary:

• if win on discard (ron): r
• if win on self draw (tsumo): t
• example: ern (east ron north)

•      wt  (west tsumo)
  

• additionally you can append the following information:
• r => riichi
• rr => double riichi (riichi first round)
• o => one shot (won in first round after riichi)
• l => won on last possible draw/discard
• w => won with tile from the dead wall
• k => robbing the kong
• 1..3 => how many other players were riichi
• example: srnro (south ron north, riichi, one shot)
• on a draw: d<ready_players><number_riichi_sticks>
• example: dew1 (draw, east and west were ready, 1 player was riichi)
• if you have one of the following yakuman: y
• o => thirteen orphans
• 9 => nine gates
• m => mahjong first round
• example: stryo (south tsumo, riichi, yakuman thirteen orphans)
• to undo a round: undo
• to redo a round: redo
• exit (and save): exit

entering a hand:

• provide 4 groups and a pair (or 7 pairs) and winning tile
• the order of information given about a group is not important (t3b=3bt=bt3 and m9g=gm9 etc.)
• <group> = <type><tile>
• <type> = q (quad/kong) | t (triple/pung) | p (pair)
• <winning_tile> = m<tile> (mahjong)
• <tile> = [<number> | d (dragon)]<color> | e (east) | s (south) | w (west) | n (north)
• <color> = r (red) | b (blue and white dragon) | g (green)
• sequence is the default type so a blue sequence 456 would be written as b4 or 4b
• to mark any group as open put an o somewhere in the group specification
• example: tbdo (open triple of blue/white dragon)
• groups are separated by whitespace
• example: 3ro 7g te qgdo pw me
• (open red sequence 345,
• closed green sequence 789,
• closed triplet of east,
• open quad of green dragons,
• pair of west,
• winning tile was east)

you can type exit anywhere in the program and it will eventually lead you back to round summary where undo is possible