Bishop's Opening · C23

Lewis Countergambit, after 4. Bxd5

1. e4 e5 2. Bc4 Bc5 3. c3 d5 4. Bxd5 Nf6

The structure hands Black the half-open d-file - rook pressure down it is a standing plan. White is up material out of the opening - Black is banking on activity to show for it.

The first 4 moves, explained

• 1. e4 Stakes a claim in the centre, controlling d5, and frees the bishop and queen.
• 1... e5 Stakes a claim in the centre, controlling d4, and frees the bishop and queen.
• 2. Bc4 Develops the bishop to c4, eyeing d5. It eyes f7, the one square only the king defends. Theory calls this the Bishop's Opening.
• 2... Bc5 Develops the bishop to c5, eyeing d4. It eyes f2, the one square only the king defends. Theory calls this the Boi Variation.

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