A DOUBLE PLAY is a play by the defense in which two offensive players are put out as a result of continuous action, providing there is no error between putouts.
(a) A force double play is one in which both putouts are force plays.
(b) A reverse force double play is one in which the first out is a force play and the second out is made on a runner for whom the force is removed by reason of the first out. Examples of reverse force plays: runner on first, one out; batter grounds to first baseman, who steps on first base (one out) and throws to second baseman or shortstop for the second out (a tag play).
Another example: bases loaded, none out; batter grounds to third baseman, who steps on third base (one out); then throws to catcher for the second out (tag play).
Rule 6.05(m) CMT
Rule 7.08(e) CMT