About this opening
King's Gambit Declined: Classical Variation, Rubinstein Countergambit is an opening in the Encyclopedia of Chess Openings,
classified under code C30. 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 8 half-moves from the
starting position, with the move sequence 1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. c3 f5.
The opening sequence in prose form: 1.e4 e5, 2.f4 Bc5, 3.Nf3 d6, 4.c3 f5. 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.