What is the Main line of the Alekhine’s Defence?
To start: White moves this pawn forward
Black responds by moving this Knight
White moves e-pawn again
Black replies by moving his Knight here
1. This is the Main line of the Alekhine’s Defence
White moves Queen’s pawn forward
Black responds by moving this pawn
White replies by moving his Knight here
2. This is the Modern Variation
White replies by moving this pawn
Black Knight retreats here
White takes this pawn
3. This is the Exchange Variation
White moves his f-pawn
4. This is the Four Pawns Attack