Main lineA40
1. d4 b5
In the centre, White holds d4.
A40
Polish Defense
2 named lines in this family, ECO A40. Every one of them opens 1. d4 b5, so the notes on those moves are written once, just below, instead of once per line. Under each line you get its moves and the sentences it adds that this page has not already printed. A line's own page carries up to its first 4 per-move notes in full.
The moves every line here plays
1. d4 b5
- 1. d4 Stakes a claim in the centre, controlling e5, and frees the bishop and queen.
- 1... b5 Opens the c8-a6 diagonal for the bishop. Theory calls this the Polish Defense.
Spassky Gambit AcceptedA40
1. d4 b5 2. e4 Bb7 3. Bxb5
The structure hands Black the half-open b-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. Black's queenside bishop takes the long diagonal.
- 2. e4 Stakes a claim in the centre, controlling d5, and frees the bishop and queen.
- 2... Bb7 Fianchettoes the bishop onto the long diagonal, pressuring d5 and e4 from a distance.
Walk these lines on a board
An account opens every move's note in this family, the plan behind each line, and a trainer that plays the line back at you. It is free.