Main lineA00
1. d3
No pawn stands on d4, e4, d5 or e5 - this line is played with the centre squares empty.
A00
4 named lines in this family, ECO A00. Every one of them opens 1. d3, so that move's note is 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.
1. d3
1. d3
No pawn stands on d4, e4, d5 or e5 - this line is played with the centre squares empty.
1. d3 e5
In the centre, Black holds e5.
1. d3 g6 2. g4
1. d3 c5 2. Nc3 Nc6 3. g3
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.