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The infield fly rule is a rule in baseball and softball intended to prevent infielders from intentionally dropping a pop-up, or allowing it to fall, in order to force a double play or triple play. Without this rule, a defense could easily turn a pop fly into a double or triple play when there are fewer than two outs with runners at first and second base or when the bases are loaded. If the runners stay near their bases to tag up, the defense could let the ball drop, throw to third base and then to second (or home to third or home to third to second), for a force-out at each base. If any of the runners stray too far from their bases, the defense could catch the pop-up and double-off any runner that failed to tag up. When the ball is in the air and the umpire signals that he is invoking the rule, the batter is out (and all force plays removed) regardless of whether the ball is caught. ==The rule== Under the Official Baseball Rules used in Major League Baseball and many lower leagues, "Infield Fly" is explained by rule 2.00 (Definitions of terms: Infield Fly), and rule 6.05e (Batter is out). The rule applies only when there are fewer than two outs, and there is a force play at third base (i.e., when there are runners at first and second base, or the bases are loaded). In these situations, if a fair fly ball is in play, and in the umpire's judgment is catchable by an infielder with ordinary effort, the umpire shall call "infield fly" (or more often, "infield fly, batter's out") and the batter will be out regardless of whether the ball is actually caught. Umpires typically raise the right arm straight up, index finger pointing up, to signal the rule is in effect. If "infield fly" is called and the fly ball is caught, it is treated exactly as an ordinary fly ball; the batter is out, there is no force, and the runners must tag up. On the other hand, if "infield fly" is called and the ball lands fair without being caught, the batter is still out, there is still no force, but the runners ''are not'' required to tag up. In either case, the ball is live, and the runners may advance on the play, at their own peril. An infield fly may be declared by any umpire on the field. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Infield fly rule」の詳細全文を読む スポンサード リンク
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