In chess, the Greek gift sacrifice, also known as the classical bishop sacrifice, is a typical sacrifice of a bishop by White playing Bxh7+ or Black playing Bxh2+ at some point after the opponent has castled kingside, with the goal generally being to attack and checkmate the opponent's king, or to regain material. It is important to consider the opponent's defenses. Greek gift sacrifices, or the threat of them, occur relatively frequently in play, especially at amateur level. One of the most famous examples of the sacrifice is found in the game Edgard Colle–John O'Hanlon, Nice 1930.[1] Less commonly, a Greek gift sacrifice may be the prelude to a double bishop sacrifice, as seen in Lasker–Bauer, Amsterdam 1889.[2]