Dutch defence - Blackburne variation
1. d4 f5 2. g3 Nf6 3. Bg2 e6 4. Nh3
White pushes the queen's pawn to d4. Black advances the f-pawn to f5. White advances the g-pawn to g3.
Black develops the knight to f6. White develops the light-squared bishop to g2. Black moves the king's pawn to e6.
White develops the knight to h3.