D29 Queen’s Gambit Accepted: Classical Defense, Alekhine System, Main Line
D29 holds three named lines, all under the name Queen’s Gambit. It leaves D28 (Queen’s Gambit Accepted: Classical Defense, Alekhine System) with 8.Bb3 Bb7. That final move, by the bishop, opens a line for the queen on d8, guards the rook on a8 and attacks the knight on f3. Of all other reference positions, the board of D27 (Queen’s Gambit Accepted: Classical Defense, Main Line) comes closest, seven squares apart.
| # | White | Black |
|---|---|---|
| 1 | d4 | d5 |
| 2 | c4 | dxc4 |
| 3 | Nf3 | Nf6 |
| 4 | e3 | e6 |
| 5 | Bxc4 | c5 |
| 6 | O-O | a6 |
| 7 | Qe2 | b5 |
| 8 | Bb3 | Bb7 |
Moves only D29 plays
Same as D28 up to 7.Qe2, then:
- 7...b5 The b-pawn advances two squares to b5, covering a4 and c4, opening a line for the bishop on c8, attacking the bishop on c4.
- 8.Bb3 The bishop goes from c4 to b3, opening a line for the queen on e2.
- 8...Bb7 The bishop leaves c8 for b7, opening a line for the queen on d8, guarding the rook on a8, attacking the knight on f3.
Lines filed under D29
All three share their first 16 plies, the whole reference line and then split two ways at White’s move 9.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Queen’s Gambit Accepted: Classical Defense, Alekhine System, Main Line | (the shared start itself) | 16 | White castled |
| Queen’s Gambit Accepted: Classical Defense, Alekhine System, Main Line | 9.Nc3 | 17 | White castled |
| Queen’s Gambit Accepted: Classical Defense, Alekhine System, Smyslov Variation | 9.Rd1 Nbd7 10.Nc3 Bd6 | 20 | White castled |
Queen’s Gambit Accepted: Classical Defense, Alekhine System, Main Line
- 9.Nc3 The knight leaves b1 for c3, opening a line for the rook on a1, guarding the queen on e2.
Queen’s Gambit Accepted: Classical Defense, Alekhine System, Smyslov Variation
- 9.Rd1 The rook goes from f1 to d1.
- 9...Nbd7 The knight leaves b8 for d7, opening a line for the rook on a8.
- 10.Nc3 The knight leaves b1 for c3, opening a line for the rook on a1, guarding the queen on e2.
- 10...Bd6 The bishop leaves f8 for d6, opening a line for the rook on h8.
The road to D29
The position after 8...Bb7
White has brought out the knight on f3 and bishop on b3; Black the knight on f6 and bishop on b7. White has a half-open c-file; Black a half-open d-file. White could capture with Bxe6, Qxb5+, dxc5. White is to move and has 34 legal moves.
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| C81 | Ruy Lopez: Open, Howell Attack | 13 squares: c2, e3, d4, e4, c5, d5, e5, c6 … |
| C82 | Ruy Lopez: Open | 15 squares: d1, e2, c3, e3, d4, e4, c5, d5 … |
| D26 | Queen’s Gambit Accepted: Normal Variation, Traditional System | 15 squares: d1, e1, f1, g1, h1, e2, b3, c4 … |
| D05 | Queen’s Pawn Game: Colle System | 16 squares: d1, e1, f1, g1, h1, c2, e2, b3 … |
| D41 | Queen’s Gambit Declined: Semi-Tarrasch Defense | 16 squares: b1, d1, e1, f1, g1, h1, e2, b3 … |
| D48 | Semi-Slav Defense: Meran Variation | 16 squares: b1, d1, e1, f1, g1, h1, e2, b3 … |
| E54 | Nimzo-Indian Defense: Normal Variation, Gligoric System, Exchange Variation | 16 squares: b1, d1, e2, b3, c3, b4, c4, b5 … |