Main line, through 3. Bg5D01
1. d4 Nf6 2. Nc3 d5 3. Bg5
In the centre, White holds d4 while Black holds d5.
D01
8 named lines in this family, ECO D01. Every one of them opens 1. d4 Nf6 2. Nc3 d5, 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.
1. d4 Nf6 2. Nc3 d5
1. d4 Nf6 2. Nc3 d5 3. Bg5
In the centre, White holds d4 while Black holds d5.
1. d4 Nf6 2. Nc3 d5 3. Bg5 Ne4
1. d4 Nf6 2. Nc3 d5 3. Bg5 Bf5
1. d4 Nf6 2. Nc3 d5 3. Bg5 Bf5 4. f3
1. d4 Nf6 2. Nc3 d5 3. Bg5 Nbd7 4. Nf3
1. d4 Nf6 2. Nc3 d5 3. Bg5 Bf5 4. Bxf6
1. d4 Nf6 2. Nc3 d5 3. Bg5 Nbd7 4. Nf3 g6
1. d4 Nf6 2. Nc3 d5 3. Bg5 c5 4. Bxf6 gxf6 5. e4 dxe4 6. d5
Black keeps the extra pawn; White plays for time, open lines, and initiative - the classic gambit trade.
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.