Best response to the English Opening: King's English Variation, Four Knights Variation, Fianchetto Line (A29)

1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6 · White to move

What is the best response to the English Opening: King's English Variation, Four Knights Variation, Fianchetto Line (1. c4 e5 2. g3 Nf6 3. Bg2 d5 4. cxd5 Nxd5 5. Nf3 Nc6)? White to move. See the top replies ranked by opening theory and real-game results, starting with d3.

The main theoretical reply is d3, reaching the English Opening: King's English Variation, Four Knights Variation, Fianchetto Line.