D12 Slav Defense: Quiet Variation, Schallopp Defense
D12 holds four named lines, all under the name Slav Defense. It leaves D11 (Slav Defense: Quiet Variation) with 4...Bf5. White’s pieces and pawns attack five squares in Black’s half, the second-lowest count of the 10 Slav Defense codes. Its deepest line, Slav Defense: Quiet Variation, Landau Variation, runs to 8.Na3, the fourth-longest of the 10 Slav Defense codes. Black’s pieces and pawns attack seven squares in White’s half, the fifth-highest count of the 10 Slav Defense codes.
| # | White | Black |
|---|---|---|
| 1 | d4 | d5 |
| 2 | c4 | c6 |
| 3 | Nf3 | Nf6 |
| 4 | e3 | Bf5 |
Moves only D12 plays
Same as D13 up to 3...Nf6, then:
- 4.e3 The e-pawn advances to e3, covering d4 and f4, opening a line for the queen on d1 and the bishop on f1.
- 4...Bf5 The bishop leaves c8 for f5, opening a line for the queen on d8, attacking the knight on b1.
Lines filed under D12
All four share their first eight plies, the whole reference line and then split two ways at White’s move 5.
| Name | After the shared start | Plies |
|---|---|---|
| Slav Defense: Quiet Variation, Schallopp Defense | (the shared start itself) | 8 |
| Slav Defense: Quiet Variation, Schallopp Defense | 5.Nc3 e6 | 10 |
| Slav Defense: Quiet Variation, Amsterdam Variation | 5.cxd5 cxd5 6.Nc3 e6 7.Ne5 Nfd7 | 14 |
| Slav Defense: Quiet Variation, Landau Variation | 5.cxd5 cxd5 6.Qb3 Qc8 7.Bd2 e6 8.Na3 | 15 |
Slav Defense: Quiet Variation, Schallopp Defense
- 5.Nc3 The knight leaves b1 for c3, opening a line for the rook on a1.
- 5...e6 The e-pawn advances to e6, covering d5 and f5, opening a line for the queen on d8 and the bishop on f8.
Slav Defense: Quiet Variation, Amsterdam Variation
- 5.cxd5 The c-pawn takes the pawn on d5, covering c6 and e6, opening a line for the bishop on f1.
- 5...cxd5 The c-pawn takes the pawn on d5, covering c4 and e4.
- 6.Nc3 The knight leaves b1 for c3, opening a line for the rook on a1.
- 6...e6 The e-pawn advances to e6, covering d5 and f5, opening a line for the queen on d8 and the bishop on f8.
- 7.Ne5 The knight goes from f3 to e5, opening a line for the queen on d1.
Slav Defense: Quiet Variation, Landau Variation
- 5.cxd5 The c-pawn takes the pawn on d5, covering c6 and e6, opening a line for the bishop on f1.
- 5...cxd5 The c-pawn takes the pawn on d5, covering c4 and e4.
- 6.Qb3 The queen goes from d1 to b3.
- 6...Qc8 The queen goes from d8 to c8, guarding the bishop on f5 and the pawn on b7, attacking the bishop on c1.
- 7.Bd2 The bishop leaves c1 for d2.
The road to D12
- 1.d4 … 2...c6four earlier stops: A40, D00, D06, D10
- 3.Nf3D11 Modern Line
- 4.e3D11 Quiet Variation
- 4...Bf5D12
The position after 4...Bf5
White has brought out the knight on f3; Black the knight on f6 and bishop on f5. White could capture with cxd5. White is to move and has 31 legal moves.
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| D04 | Queen’s Pawn Game: Colle System | six squares: c2, c4, f5, c6, c7, c8 |
| D15 | Slav Defense: Three Knights Variation | six squares: b1, e2, c3, e3, f5, c8 |
| D18 | Slav Defense: Czech Variation, Classical System | six squares: b1, a2, c3, a4, c4, d5 |
| D25 | Queen’s Gambit Accepted: Normal Variation | six squares: c4, d5, f5, c6, c7, c8 |
| D45 | Semi-Slav Defense: Main Line | six squares: b1, c3, f5, e6, e7, c8 |
| A31 | English Opening: Symmetrical Variation, Anti-Benoni Variation | eight squares: e2, e3, c5, d5, f5, c6, d7, c8 |
| A54 | Old Indian Defense: Tartakower-Indian | eight squares: e2, e3, g4, d5, f5, c6, d6, c7 |
Where lines continue from here
One named line filed under other codes passes through the position after 4...Bf5. It belongs to D13.