有下的同好一起反應吧!!!!
規則寫的清清楚楚的
A Regulation Game
(a) A regulation game consists of nine innings, unless extended because of a
tie score, or shortened:
(1) because the home team needs none of its half of the ninth inning or only a
fraction of it; or
(2) because the umpire calls the game.
EXCEPTION 1:
National association leagues may adopt a rule providing that one or both games
of a double-header shall be seven innings in length. In such games, any of
these Rules applying to the ninth inning shall apply to the seventh inning.
規則寫的很明白，可以採用一場或是兩場都只打七局，比賽中規則同一般９局長度的比賽
OFFICIAL AUSTRALIAN BASEBALL RULES 　即可搜尋到