D66 Queen’s Gambit Declined: Orthodox Defense, Bd3 Line
D66 holds three named lines, all under the name Queen’s Gambit. It leaves D63 (Queen’s Gambit Declined: Orthodox Defense, Main Line) with 8.Bd3. White has four minor pieces off their first squares, level for the most of the 44 Queen’s Gambit codes. Lines filed under D67 and D68 reach one of its named positions by a different move order.
| # | White | Black |
|---|---|---|
| 1 | d4 | d5 |
| 2 | c4 | e6 |
| 3 | Nc3 | Nf6 |
| 4 | Bg5 | Be7 |
| 5 | e3 | O-O |
| 6 | Nf3 | Nbd7 |
| 7 | Rc1 | c6 |
| 8 | Bd3 |
The move that completes D66
The reference line of D67 plays all of these moves and continues beyond them; D66 is the position reached at 8.Bd3.
- 8.Bd3 The bishop leaves f1 for d3, opening a line for the rook on h1.
Lines filed under D66
All three share the start 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 and then split two ways at Black’s move 4.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Queen’s Gambit Declined: Orthodox Defense, Bd3 Line | 4...Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 | 15 | Black castled |
| Queen’s Gambit Declined: Orthodox Defense, Bd3 Line | 4...Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 h6 9.Bh4 | 17 | Black castled |
| Queen’s Gambit Declined: Orthodox Defense, Fianchetto Variation | 4...c6 5.Nf3 Be7 6.e3 Nbd7 7.Rc1 O-O 8.Bd3 dxc4 9.Bxc4 b5 | 18 | Black castled |
Queen’s Gambit Declined: Orthodox Defense, Bd3 Line
- 4...Be7 The bishop leaves f8 for e7, opening a line for the rook on h8.
- 5.e3 The e-pawn advances to e3, covering d4 and f4, opening a line for the queen on d1 and the bishop on f1.
- 5...O-O Black castles kingside, opening a line for the queen on d8, guarding the pawn on g7.
- 6.Nf3 The knight leaves g1 for f3, opening a line for the rook on h1, guarding the bishop on g5.
- 6...Nbd7 The knight leaves b8 for d7, opening a line for the rook on a8.
Queen’s Gambit Declined: Orthodox Defense, Fianchetto Variation
- 4...c6 The c-pawn advances to c6, covering b5 and d5, opening a line for the queen on d8.
- 5.Nf3 The knight leaves g1 for f3, opening a line for the rook on h1, guarding the bishop on g5.
- 5...Be7 The bishop leaves f8 for e7, opening a line for the rook on h8.
- 6.e3 The e-pawn advances to e3, covering d4 and f4, opening a line for the queen on d1 and the bishop on f1.
- 6...Nbd7 The knight leaves b8 for d7, opening a line for the rook on a8.
The road to D66
Four of the 12 named positions on the way are reached by a move order other than their own.
The position after 8.Bd3
White has brought out the knight on c3, knight on f3, bishop on d3 and bishop on g5; Black the knight on d7, knight on f6 and bishop on e7. Black could capture with dxc4. Black is to move and has 29 legal moves.
Codes that branch off from D66
The reference lines of one other code leave D66 from the position after 8.Bd3, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| D67 | 8...dxc4 9.Bxc4 Nd5 | Queen’s Gambit Declined: Orthodox Defense, Capablanca System |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| D64 | Queen’s Gambit Declined: Orthodox Defense, Rubinstein Attack | four squares: d1, f1, c2, d3 |
| D60 | Queen’s Gambit Declined: Orthodox Defense | six squares: a1, c1, f1, d3, c6, c7 |
| D46 | Semi-Slav Defense: Main Line | eight squares: a1, c1, g5, e7, e8, f8, g8, h8 |
| D54 | Queen’s Gambit Declined: Neo-Orthodox Variation | eight squares: f1, g1, d3, f3, c6, c7, d7, b8 |
| D55 | Queen’s Gambit Declined: Modern Variation, Normal Line | eight squares: a1, c1, f1, d3, c6, c7, d7, b8 |
| D61 | Queen’s Gambit Declined: Orthodox Defense, Rubinstein Variation | eight squares: a1, c1, d1, f1, c2, d3, c6, c7 |
| D65 | Queen’s Gambit Declined: Orthodox Defense, Rubinstein Attack | eight squares: d1, f1, c2, d3, c4, d5, a6, a7 |
Where lines continue from here
Nine named lines filed under other codes pass through the position after 8.Bd3. Besides the codes above, they belong to D68, D69.
Other move orders
- Queen’s Gambit Declined: Orthodox Defense, Bd3 Line is also reached inside D67 Queen’s Gambit Declined: Orthodox Defense, Janowski Variation, whose order is 1.d4 d5 2.Nf3 Nf6 3.c4 e6 4.Nc3 Be7 5.Bg5 O-O 6.e3 Nbd7 7.Rc1 c6 8.Bd3.
- Queen’s Gambit Declined: Orthodox Defense, Bd3 Line is also reached inside D68 Queen’s Gambit Declined: Orthodox Defense, Classical Variation, whose order is 1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.Nc3 Be7 5.Bg5 O-O 6.e3 Nbd7 7.Rc1 c6 8.Bd3.