Before anyone can be dealt a single tile, the wall has to be broken — split open at one exact stack, found with a dice roll and a count. Get the spot wrong and the whole hand deals from the wrong tiles.
Short answer: roll dice to get a total, then count that many stacks along the wall starting from its counterclockwise (right-hand) end. The wall breaks immediately after the stack you land on — push it outward and start dealing from there. Which wall you count along, and how many rolls it takes, depends on whether you're playing Chinese or American mahjong.
After the tiles are shuffled, each of the four players builds a wall of stacked tiles in front of themselves — two tiles high, pushed together into a square with the other three players' walls. That's the "wall": four straight sections of stacked tiles, one per player, forming a closed square in the middle of the table.
Dealing can't start at a random point along that closed square — tradition (and superstition, in older rule sets) calls for the starting point to be picked by dice, not chosen by a player. Breaking the wall means opening it at that dice-determined spot: the stack there gets pushed outward, and dealing proceeds counterclockwise from the gap it leaves.
The break point is one stack along a wall, found by counting from that wall's counterclockwise (right-hand) end. Dealing starts there and proceeds counterclockwise.
This is where Chinese and American mahjong genuinely diverge — not a minor variation, a different number of rolls and, in Chinese rules, potentially a different wall entirely.
The selected wall can belong to any seat, including the dealer's own — it isn't always the dealer's wall that breaks under Chinese rules.
This is the simpler, one-roll version most people picture — but it's correct specifically for American mahjong. Applying it to a Chinese-rules game gets the wrong wall most of the time.
Two things cause most of the confusion at the table: counting from the wrong end of the wall (it's always the counterclockwise / right-hand end, counted toward the owner's left), and assuming the dealer's own wall always breaks — true in American rules, false in Chinese rules. Miscounting even one stack shifts the entire hand's starting tiles.
Roll dice, count that many stacks from the counterclockwise end of the relevant wall, and break it after that stack. American mahjong uses one roll on East's own wall; Chinese mahjong uses two rolls and can select any wall.
Only in American mahjong. In Chinese MCR rules, a second roll can send the break to any of the four walls.
Always from the counterclockwise (right-hand) end of the wall toward the owner's left.
Mahjong Dealer rolls both dice for you and lights up the exact break tile with an arrow showing which way to push it — correct rules for Chinese or American play, automatically.
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