About this opening
Bishop's Opening: Philidor Counterattack is an opening in the Encyclopedia of Chess Openings,
classified under code C23. ECO group C (C00–C99)
covers open games (1.e4 e5) and the French Defence, including the Ruy Lopez, Italian, Scotch and King's Gambit. This particular variation is reached
after 4 half-moves from the
starting position, with the move sequence 1. e4 e5 2. Bc4 c6.
It belongs to the Bishop's Opening family. Within that family this is a sub-variation (the Philidor Counterattack line).
The opening sequence in prose form: 1.e4 e5, 2.Bc4 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.