Sicilian Defense: McDonnell Attack, Toilet Variation

The Sicilian Defense: McDonnell Attack, Toilet Variation is a chess opening classified under ECO code B21 in the Semi-Open Games family, where Black responds to 1.e4 with something other than 1...e5, including the Sicilian Defense, Caro-Kann, and Pirc. It is reached after 3 moves: 1. e4 c5 2. f4 d5 3. Nc3. The resulting position leaves black to move.