three-card monte

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A gambling game in which the dealer shows a player three cards, then turns them face down and moves them around, and the player must guess the position of a particular card.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A confidence game in which the victim, or mark, is tricked into betting a sum of money that they can find the money card, for example the queen of hearts, among three face-down playing cards.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a gambling card game of Spanish origin; 3 or 4 cards are dealt face up and players bet that one of them will be matched before the others as the cards are dealt from the pack one at a time