Champion Tactics with GM Wolff - In Between Moves
An in-between move or Zwischenzug is one that is made unexpectedly in the midst of a sequence of moves. But not just any series of moves, one in which the player falling for the Zwischenzug feels the sequence is forced, while his opponent demonstrates to him that it certainly isn't! Most commonly these fall in between trades where a recapture seems to be the only proper means of play. Such in-between moves often have a surprising and pleasing effect of increasing the potency of a combination beyond the opponent's expectations.