B21

Sicilian Defense: McDonnell Attack, Toilet Variation

1. e4 c5 2. f4 d5 3. Nc3

The Sicilian Defense: McDonnell Attack, Toilet Variation is a chess opening classified under ECO code B21. It is reached after the moves 1. e4 c5 2. f4 d5 3. Nc3.

It belongs to the Sicilian Defense family — one of many ways the line can branch. Understanding the parent system’s plans is the fastest way to play this variation well.

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