Grob Opening: Romford Countergambit is a chess opening with the ECO code A00, part of the Grob Opening family. It goes 1. g4 d5 2. Bg2 Bxg4 3. c4 d4. White opens with 1. g4 (the Grob move) and Black answers 1... d5. After 6 moves it is White to move. After the last move Black is a pawn ahead in material. The lesson on the board explains every move of the line and lets you play it yourself; it is free.
The moves
1. g4 – White plays the pawn to g4
1... d5 – Black plays the pawn to d5
2. Bg2 – White plays the bishop to g2
2... Bxg4 – Black takes on g4 with the bishop
3. c4 – White plays the pawn to c4
3... d4 – Black plays the pawn to d4
About the Grob Opening
White starts with 1.g4, an offbeat and risky move. The idea is Bg2 pressing on b7 and d5, but it weakens White's kingside.
After 1...d5 2.Bg2, White attacks d5 and may play c4.
The g4 pawn can be attacked by ...Bxg4 or ...h5.
White should not castle kingside too fast; the king can be exposed.