D17 Slav Defense: Czech Variation
D17 holds eight named lines, all under the name Slav Defense. It leaves D16 (Slav Defense: Alapin Variation) with 5...Bf5. Its deepest line, Slav Defense: Czech Variation, Carlsbad Variation, Morozevich Variation, runs to 11...g5, the longest of the 10 Slav Defense codes. When the reference line ends, Black is one pawn up on material. White, to move in that position, has 34 legal moves, the fourth-highest count of the 10 Slav Defense codes.
| # | White | Black |
|---|---|---|
| 1 | d4 | d5 |
| 2 | c4 | c6 |
| 3 | Nf3 | Nf6 |
| 4 | Nc3 | dxc4 |
| 5 | a4 | Bf5 |
The move that completes D17
The reference line of D18 plays all of these moves and continues beyond them; D17 is the position reached at 5...Bf5.
- 5...Bf5 The bishop leaves c8 for f5, opening a line for the queen on d8.
Lines filed under D17
All eight share their first ten plies, the whole reference line and then split two ways at White’s move 6.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Slav Defense: Czech Variation | (the shared start itself) | 10 | Black +1 |
| Slav Defense: Czech Variation, Bled Attack | 6.Nh4 | 11 | Black +1 |
| Slav Defense: Czech Variation, Krause Attack | 6.Ne5 | 11 | Black +1 |
| Slav Defense: Czech Variation, Wiesbaden Variation | 6.Ne5 e6 | 12 | Black +1 |
| Slav Defense: Czech Variation, Krause Attack, Fazekas Gambit | 6.Ne5 Na6 7.e4 | 13 | Black +1 |
| Slav Defense: Czech Variation, Wiesbaden Variation, Sharp Line | 6.Ne5 e6 7.f3 Bb4 8.e4 | 15 | Black +1 |
| Slav Defense: Czech Variation, Carlsbad Variation | 6.Ne5 Nbd7 7.Nxc4 Qc7 8.g3 e5 | 16 | |
| Slav Defense: Czech Variation, Carlsbad Variation, Morozevich Variation | 6.Ne5 Nbd7 7.Nxc4 Qc7 8.g3 e5 9.dxe5 Nxe5 10.Bf4 Nfd7 11.Bg2 g5 | 22 |
The road to D17
- 1.d4 … 4.Nc3six earlier stops: A40, D00, D06, D10, D11, D15
- 4...dxc4D15 Two Knights Attack
- 5.a4D16 Alapin Variation
- 5...Bf5D17
The position after 5...Bf5
White has brought out the knight on c3 and knight on f3; Black the knight on f6 and bishop on f5. White has a half-open c-file; Black a half-open d-file.
Codes that branch off from D17
The reference lines of one other code leave D17 from the position after 5...Bf5, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| D18 | 6.e3 | Slav Defense: Czech Variation, Classical System |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| D15 | Slav Defense: Three Knights Variation | six squares: a2, a4, c4, d5, f5, c8 |
| D24 | Queen’s Gambit Accepted: Showalter Variation | six squares: a2, a4, f5, c6, c7, c8 |
| D12 | Slav Defense: Quiet Variation, Schallopp Defense | eight squares: b1, a2, e2, c3, e3, a4, c4, d5 |
| D14 | Slav Defense: Exchange Variation, Symmetrical Line | eight squares: c1, a2, a4, c4, f4, d5, c6, b8 |
| D23 | Queen’s Gambit Accepted | eight squares: b1, a2, c3, a4, f5, c6, c7, c8 |
| D43 | Semi-Slav Defense | eight squares: a2, a4, c4, d5, f5, e6, e7, c8 |
| D44 | Semi-Slav Defense Accepted | eight squares: c1, a2, a4, f5, g5, e6, e7, c8 |
Where lines continue from here
Five named lines filed under other codes pass through the position after 5...Bf5. Besides the codes above, they belong to D19.