Keep score for a real table, build a hand and see what it pays, and drill the counting until it's automatic. Hong Kong rules throughout, with the reference tables behind every number.
A live scoreboard for a real table. One person records each hand on their phone; everyone else follows from a share link. Scores, dealer and prevailing wind track themselves, nothing is ever silently edited, and every session survives as a record you can go back through.
Rooms group the tables from one gathering · player stats carry across games · no accounts, the share code is the game.
Drag tiles onto the felt and the studio reads the hand live — what it's called, the itemized fan, what it's waiting on, and how different tables would pay it.
Two drills, graded by the Studio's engine: count what a finished hand is worth, or read what thirteen tiles are waiting on. Here's one, self-drawn, West round.
One tile apart, and one of them is a limit hand. That gap is the whole drill.
Every fan condition illustrated with tiles, six real house systems compared side by side, and the fan → points → money pipeline.
What fan, fu, and limits actually mean, and how the major styles diverge before you pick one.
Slang, trash talk, superstitions and swear words from Cantonese, Japanese, Mandarin and English tables.
Who runs Mahjong Research Co and why the site exists.