Selon le wiki Smash:
General rules
2 or 3 stock.
6 or 8 minutes.
Items are turned to off and none.
Pause is disabled.*
Stalling is banned.
If time runs out, the winner is determined by remaining stock, and then by ending damage percentage.
If both stock and percentage are identical, or a game ends with both players being KO'd simultaneously, then a tiebreaker is played. A tiebreaker is a 1 stock, 3 minute match with the same characters and the same stage.
*This rule isn't strictly enforced, and as such, a rule regarding accidental pausing is enacted.
Doubles rules
3 stocks.
8 minutes.
Team attack is on.
Sharing stocks is allowed.
If the clock expires and the total number of stocks of each team is equal, use the sum of the final percentage of the players on each team as the tiebreaker; whichever team has a lower sum wins. (A player who has been eliminated has 0 stocks and 0%.)