These variations are typical of many Greek gift sacrifices, though the outcome is not always so clear-cut.
Greek gift sacrifices, or the threat of them, occur relatively frequently in play, especially at the lower levels. One of the most famous examples of the sacrifice is found in the game Edgard Colle - O'Hanlon, Nice 1930. Less commonly, a Greek gift sacrifice may be the prelude to a double bishop sacrifice, as seen in the game Lasker - Bauer, Amsterdam 1889.
The etymology of the phrase "Greek gift" in this context is not entirely clear. The obvious explanation is that it alludes to the Trojan Horse, and specifically to Virgil's famous "timeo danaos et dona ferentes" ("I fear the Greeks even [when they are] bringing gifts", Aeneid II.49). The Oxford Companion to Chess, however, suggests that one explanation is that the sacrifice often occurred in Gioachino Greco's games.