About this opening
English Opening: King's English Variation, Two Knights Variation, Keres Variation is an opening in the Encyclopedia of Chess Openings,
classified under code A23. ECO group A (A00–A99)
covers flank and irregular openings, including the English, Bird, Réti and Dutch defences. This particular variation is reached
after 6 half-moves from the
starting position, with the move sequence 1. c4 e5 2. Nc3 Nf6 3. g3 c6.
It belongs to the English Opening family.
Within that family this is a level-3 branch (the King's English Variation → Two Knights Variation → Keres Variation line). The immediate parent line is English Opening: King's English Variation, Two Knights Variation, transitioned via 3…c6.
The opening sequence in prose form: 1.c4 e5, 2.Nc3 Nf6, 3.g3 c6. From this position the encyclopaedia records no further canonical continuations — practical play branches into unnamed transpositions or returns to the parent line for alternative ideas.