Tackle-eligible play

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In football, the tackle-eligible play is a forward-pass play in which coaches will attempt to create mismatches against a defense by inserting an offensive tackle (who is not normally allowed more than five yards down field on a forward-pass play), into an offensive formation as an eligible receiver, usually as a tight end or as a fullback. This is done by changing the formation of the offensive line, via positioning two linemen (including the "catching tackle") on one side of the center and three linemen on the other.

Under almost all versions of football, offensive linemen cannot receive or touch forward passes, nor can they advance downfield in passing situations. To identify which receivers are eligible and which are not, football rules stipulate that ineligible receivers must wear a number between 50 and 79. However, in some leagues, normally ineligible receivers may align as an eligible receiver provided they inform the referee of such a change. Typically, a player must leave the field for a single play before returning to their original position.