Zwischenzug – the intermediate move

The term was first used by Fred Reinfeld and Irving Chernev, in 1933. It is a chess tactic in which a player, instead of playing the expected move (commonly a recapture), first interposes another move posing an immediate threat that the opponent must answer, and only then plays the expected move. Leading chess trainer and analyst, GM Efstratios Grivas, tells us how this tactical manoeuvre works.