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In baseball, a force is a situation when a baserunner is compelled (or forced) to vacate his time-of-pitch base—and thus try to advance to the next base—because the batter became a runner. A runner at first base is always forced to attempt to advance to second base when the batter becomes a runner. Runners at second or third base are forced only when all bases preceding their time-of-pitch base are occupied by other baserunners and the batter becomes a runner.
A forced runner's force base is the next base beyond his time-of-pitch base. Any attempt by fielders to put a forced runner out is called a force play. Think of forced runners as bumper cars. If with a runner on first, the batter hits a ground ball, the batter must run to first, and since two runners are not allowed to stay on one base at one time, the runner who was on first to begin with is now bumper-carred by the advancing batter over to second. If there already was a runner on second as well, that runner is now bumper-carred over to third, and so on. If a runner is bumper-carred over to the next base by the advancing batter or by another runner who was bumper-carred by the advancing batter, then that runner is considered to have been forced to advance to the next base. If, however, with a runner on third, for example, the batter hits a ground ball, the batter must run to first, but the runner on third, not having been bumper-carred by the batter, is not forced to advance and can stay where he is if he elects to.
Force plays, or Force outs, are one of the two ways to get a runner out on a ground ball. For a fielder to get a forced, bumper-carred runner out, he needs only to retrieve the hit ball and (1) step on the base in question before the forced runner gets there, or (2) tag that runner before the runner gets there. For example, with a runner on first, the batter hits a ground ball to the second baseman. The runner on first is being bumper-carred or forced over to second by the advancing batter. Since this is a force play, the second baseman, once he catches the ball, needs only to step on second base or tag the runner before the bumper-carred runner gets there in order to get him out. A tag out, or tag play, the second way to get a runner out on a ground ball, involves an unforced runner and is much more difficult to execute.
A force on a runner is "removed" when the batter or a following runner is put out. This most often happens on fly outs—on such, the batter-runner is out, and the other runner(s) must return to their time-of-pitch base, known as tagging up. It also occasionally happens when a sharply hit ground ball is fielded by the first baseman, who then quickly steps on first base to force out the batter-runner. This removes the requirement that the runner already on first must advance to second base; he cannot be forced out by a defensive player holding the ball while touching second base, and the runner can try to escape from a rundown by returning to first base.
For force outs resulting from neighborhood plays, see the highlighted link.
Scoring on force outs
No run can be scored during the same continuous playing action as a force out for the third out, even if a runner reaches home plate before the third out is recorded. As a result, on a batted ball with two outs, fielders will nearly always ignore a runner trying to score, attempting instead to force out the batter or another runner. For example, suppose there are runners on first and third with one out. The batter hits a ground ball to the second baseman. The second baseman, seeing the bumper-carred runner on first heading his way, retrieves the ball and steps on second to get him out on the force out for the second out of the inning. If the runner on third had meanwhile run home and touched home plate, his run would count. But suppose the same play happened with two players out. The second baseman, seeing the bumper-carred runner on first heading his way, retrieves the ball and steps on second to get him out on the force play for the third out of the inning. If the runner on third had meanwhile run home and touched home plate, that run would not have counted. Note that the 2nd baseman, tagging such a forced runner coming from first for the 3rd out, also prevents scoring by the speedy runner from third as this tag is considered a force out.
An appeal play may also be a force play; for example, with runners on first and third bases and two out, the batter gets a hit but the runner from first misses second base on the way to third. After a proper appeal, this runner will be called out. This is a force out because the runner was out for failing to touch a base to which he was forced; this force out is the third out and thus the run does not score. However, most appeals are not force plays, because appeals usually do not involve a forced runner.
It is not a force out when a runner is put out while trying to tag up after a caught fly ball. Because this out is similar to a true force out, in that the runner can be put out by a fielder possessing the ball at the base that the runner needs to reach, there is a widespread misconception that this out is a force out. But it is not, which means the run would count if it scored before the third out is made on a runner trying to tag up.