A00

Formation

2 named lines in this family, ECO A00. Every one of them opens 1. a3 e5, 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. a3 e5

• 1. a3 A useful waiting move that keeps the structure flexible on the a-file. Theory calls this the Anderssen's Opening.
• 1... e5 Stakes a claim in the centre, controlling d4, and frees the bishop and queen.

Hippopotamus AttackA00

1. a3 e5 2. b3 d5 3. c3 Nf6 4. d3 Nc6 5. e3 Bd6 6. f3 O-O 7. g3

In the centre, Black holds d5 and e5.

• 2. b3 Prepares the fianchetto: the bishop will take the long diagonal via b2.
• 2... d5 Stakes a claim in the centre, controlling e4, and frees the bishop and queen.

Shy AttackA00

1. a3 e5 2. g3 d5 3. Bg2 Nf6 4. d3 Nc6 5. Nd2 Bd6 6. e3 O-O 7. h3

White's kingside bishop takes the long diagonal.

• 2. g3 Prepares the fianchetto: the bishop will take the long diagonal via g2.

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.

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