Swindle

A swindle is a ruse by which a player in a losing position tricks his opponent, and thereby achieves a win or draw instead of the expected loss.

Frank Marshall, a gifted tactician who was one of the world's strongest players in the early 20th century, has been called "the most renowned of swindlers".

Perhaps the most celebrated of his many "Marshall swindles", a term coined because Marshall was famed for extricating himself from hopeless positions by such means, is Marshall–Marco, Monte Carlo 1904. 

Marshall wrote of the above position, "White's position has become desperate, as the hostile b-pawn must queen." White could play 45.Rxc7+, but Black would simply respond 45...Kb8, winning. Many players would resign here, but Marshall saw an opportunity for "a last swindle". He continued 45.c6! Now Black could have played 45...bxc6!, but disdained it because White could then play 46.Rxc7+ Kb8 47.Rb7+! Kxb7 48.Nc5+, winning Black's rook and stopping Black's pawn from advancing. Black should have played this line, however, because he still wins after 48...Ka7 49.Nxa4 Bd4! (trapping the knight) 50.Kf3 Ka6 51.Ke4 Ka5 52.Kxd4 Kxa4 53.Kc3 Ka3 and Black's pawn queens after all. Instead, Marco played 45...Be5?, mistakenly thinking that this would put an end to Marshall's tricks.