Queen's Pawn Game: Mason Attack

1.
1. d4
2. d5
2.
3. f4

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The Queen's Pawn Game: Mason Attack is a chess opening classified under ECO code D00 (Closed & Semi-Closed games). It is a variation of the Queen's Pawn Game family. Step through the moves on the board above, then play the line yourself or review it with the built-in engine.