* 2...Qe7 (the Gunderam Defense)* 2...Qf6 (the Greco Defence)* 2...f6 (the Damiano Defence)* 2...d5 (the Elephant Gambit)* 2...f5 (the Latvian Gambit)These openings are all categorized in the ECO under code C40.
* 2...Кb8-с6* 2...Кg8-f6 (Русская партия)* 2...d7-d6 (Защита Филидора)* 2...Фd8-e7* 2...Фd8-f6* 2...f7-f6* 2...d7-d5 (Центральный контргамбит)* 2...f7-f5 (Латышский гамбит)* Chessgames.com