About this opening
Philidor Defense: Hanham Variation, Delmar Variation is an opening in the Encyclopedia of Chess Openings,
classified under code C41. 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 9 half-moves from the
starting position, with the move sequence 1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. Bc4 c6 5. c3.
It belongs to the Philidor Defense family.
Within that family this is a level-2 branch (the Hanham Variation → Delmar Variation line). The immediate parent line is Philidor Defense: Hanham Variation, transitioned via 5.c3.
The opening sequence in prose form: 1.e4 e5, 2.Nf3 d6, 3.d4 Nd7, 4.Bc4 c6, 5.c3. 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.