Catalan - open - 5.Qa4

White advances the queen's pawn to d4. Black develops the knight to f6. White moves the c-pawn to c4.

Black moves the king's pawn to e6. White plays the g-pawn to g3. Black plays the queen's pawn to d5.

White develops the light-squared bishop to g2. Black captures on c4 with the queen's pawn. White deploys the queen to a4, giving check.