A28: English, four knights, Nimzovich variation
1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. e4
English, four knights, Nimzovich variation
A28 Sub-variants:
- English, four knights system
1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6
- English, Nenarokov variation
1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. d4 exd4 5. Nxd4 Bb4 6. Bg5 h6 7. Bh4 Bxc3+ 8. bxc3 Ne5
- English, Bradley Beach variation
1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. d4 e4
- English, four knights, Nimzovich variation
1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. e4
- English, four knights, Marini variation
1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. a3
- English, four knights, Capablanca variation
1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. d3
- English, four knights, 4.e3
1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. e3
- English, four knights, Stean variation
1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. e3 Bb4 5. Qc2 O-O 6. Nd5 Re8 7. Qf5
- English, four knights, Romanishin variation
1. c4 e5 2. Nc3 Nc6 3. Nf3 Nf6 4. e3 Bb4 5. Qc2 Bxc3