4 W. The queen's pawn one move.*
B. The king's bishop's pawn two moves.f
5 W. The queen's knight at her bishop's third
square. B. The king's knight at his bishop's third square.
6 W. The king's bishop's pawn one move.
B. The king's bishop at his queen's bishop's fourth square.
7 W. The queen's knight at her rook's fourth
square.^ B. The bishop takes the knight, near the white king's rook.§
8 W. The rook takes the bishop.
B. The king castles.||
game. But if he had neither pushed this pawn, nor taken the gambit pawn, in this case you must have pushed your king's bishop's pawn two steps, and your game would have been in the best of situations.
* If, instead of pushing your pawn forwards, you had taken his king's pawn, you had lost the advantage of the attack. This is the subject of a third back-game.
f If he had played any thing else, you must have pushed your king's bishop's pawn two steps, and by this means have procured your pieces an entire liberty.
^ If, instead of playing your knight in order to take his king's bishop, or make him remove it from that line, you had taken the gambit pawn, you had lost the game again. This is shown by a fourth back-game.
§ If, instead of taking your knight, he had played his bishop at your queen's fourth square, you must have attacked it with your king's knight, and taken the next move.
|| If, instead of castling, he had pushed his queen's knight's pawn two steps in order to sustain his gambit pawn, it appears by a fifth back-game that he had lost; and if instead of either of these two moves, he had chosen to take your king's pawn, your retaking it would have hindered him from taking yours again with his knight, because he would have lost the game by your giving him check with your queen.