Albin Countergambit · Basic
Opponent's mistake · 5.Nb4
1.d4 d5 2.c4 e5 3.Nc3 exd4 4.Nxd5 c6 5.Nb4 Bxb4+
- d5: Takes the centre and controls e4.
- e5: Countergambit: offers a pawn to open the centre and attack straight away.
- exd4: Takes on d4: now Black's pawn attacks the c3 knight.