D98 Grünfeld Defense: Russian Variation, Smyslov Variation
D98 holds two named lines, all under the name Grünfeld Defense. It leaves D97 (Grünfeld Defense: Russian Variation) with 7...Bg4. White, to move in that position, has 45 legal moves, the second-highest count of the 20 Grünfeld Defense codes. Black’s pieces and pawns attack five squares in White’s half, the fourth-highest count of the 20 Grünfeld Defense codes. Queenside castling appears once among its lines, in Grünfeld Defense: Russian Variation, Keres Variation.
| # | White | Black |
|---|---|---|
| 1 | d4 | Nf6 |
| 2 | c4 | g6 |
| 3 | Nc3 | d5 |
| 4 | Nf3 | Bg7 |
| 5 | Qb3 | dxc4 |
| 6 | Qxc4 | O-O |
| 7 | e4 | Bg4 |
The move that completes D98
The reference line of D99 plays all of these moves and continues beyond them; D98 is the position reached at 7...Bg4.
- 7...Bg4 The bishop leaves c8 for g4, opening a line for the queen on d8, attacking the knight on f3.
Lines filed under D98
Both share their first 14 plies, the whole reference line.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Grünfeld Defense: Russian Variation, Smyslov Variation | (the shared start itself) | 14 | Black castled |
| Grünfeld Defense: Russian Variation, Keres Variation | 8.Be3 Nfd7 9.Be2 Nb6 10.Qd3 Nc6 11.O-O-O | 21 | both castled |
Grünfeld Defense: Russian Variation, Keres Variation
- 8.Be3 The bishop leaves c1 for e3, opening a line for the rook on a1.
- 8...Nfd7 The knight goes from f6 to d7, opening a line for the bishop on g7.
- 9.Be2 The bishop leaves f1 for e2, opening a line for the rook on h1.
- 9...Nb6 The knight goes from d7 to b6, opening a line for the bishop on g4 and the queen on d8, guarding the rook on a8, attacking the queen on c4.
- 10.Qd3 The queen goes from c4 to d3.
The road to D98
- 1.d4 … 4...Bg7eight earlier stops: A40, A45, A50, D80, D90, E60, E61
- 5.Qb3D96 Russian Variation
- 7.e4D97 Russian Variation
- 7...Bg4D98
The position after 7...Bg4
White has brought out the knight on c3 and knight on f3; Black the knight on f6, bishop on g4 and bishop on g7. White has a half-open c-file; Black a half-open d-file. White could capture with Qxc7, Qxf7+.
Codes that branch off from D98
The reference lines of one other code leave D98 from the position after 7...Bg4, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| D99 | 8.Be3 Nfd7 9.Qb3 | Grünfeld Defense: Russian Variation, Smyslov Variation |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| D95 | Grünfeld Defense: Three Knights Variation, Vienna Variation | seven squares: b3, e3, c4, e4, g4, d5, c8 |
| E91 | King’s Indian Defense: Orthodox Variation | seven squares: d1, f1, e2, c4, g4, d6, c8 |
| E81 | King’s Indian Defense: Sämisch Variation, Normal Defense | eight squares: d1, g1, f2, f3, c4, g4, d6, c8 |
| D93 | Grünfeld Defense: Three Knights Variation, Hungarian Variation | nine squares: c1, d1, e3, c4, e4, f4, g4, d5 … |
| E90 | King’s Indian Defense: Normal Variation, Rare Defenses | nine squares: d1, c4, g4, d6, c8, e8, f8, g8 … |
| E92 | King’s Indian Defense: Orthodox Variation | nine squares: d1, f1, e2, c4, g4, e5, d6, e7 … |
| B08 | Pirc Defense: Classical Variation | 11 squares: d1, c2, c4, g4, d6, g7, c8, e8 … |
Where lines continue from here
Two named lines filed under other codes pass through the position after 7...Bg4. All of them belong to the codes listed above.