The best example I can give of a 'timed play' is when the pitcher attempts to pick off a runner at second base. The catcher will give a signal, maybe touching his mask or pounding his fist in his glove. This signal means that at the count of two the second baseman or shortstop, whoever has the responsibility of covering the bag, will start moving towards second base and at the count of four, the pitcher will whirl around and throw to second in an attempt to pick off the runner. The pitcher cannot turn around and see that a runner is taking a big lead off of second base and attempt to pick the runner off because the runner will head back to second as soon as he sees the pitcher looking at him. So, a 'timed play' is executed ... the shortstop/second baseman sneaks to the base behind the runner's back in the hope that the runner does not notice and the pitcher suddenly whirls around and throws in the hopes that he catches the base runner off guard.
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