D79 Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation
D79 holds ten named lines, all under the name Neo-Grünfeld Defense. It leaves D78 (Neo-Grünfeld Defense: Classical Variation, Original Defense) with 7.cxd5 cxd5. With ten named lines it is the largest code of the 10 Neo-Grünfeld Defense codes. Its deepest line, Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation, runs to 9.Bf4, the longest of the 10 Neo-Grünfeld Defense codes. After 7...cxd5 the position is a mirror image: every Black man stands opposite its White counterpart. No other Neo-Grünfeld Defense code shares this.
| # | White | Black |
|---|---|---|
| 1 | d4 | Nf6 |
| 2 | c4 | g6 |
| 3 | Nf3 | Bg7 |
| 4 | g3 | O-O |
| 5 | Bg2 | c6 |
| 6 | O-O | d5 |
| 7 | cxd5 | cxd5 |
Moves only D79 plays
Same as D78 up to 6...d5, then:
- 7.cxd5 The c-pawn takes the pawn on d5, covering c6 and e6.
- 7...cxd5 The c-pawn takes the pawn on d5, covering c4 and e4.
Lines filed under D79
All ten share the start 1.d4 Nf6 2.c4 g6 and then split two ways at White’s move 3.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation | 3.Nf3 Bg7 4.g3 O-O 5.Bg2 c6 6.O-O d5 7.cxd5 cxd5 | 14 | both castled |
| Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation | 3.Nf3 Bg7 4.g3 O-O 5.Bg2 c6 6.O-O d5 7.cxd5 cxd5 8.Nc3 Nc6 | 16 | both castled |
| Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation | 3.Nf3 Bg7 4.g3 O-O 5.Bg2 c6 6.O-O d5 7.cxd5 cxd5 8.Nc3 Ne4 | 16 | both castled |
| Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation | 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.O-O c6 7.cxd5 cxd5 8.Ne5 e6 | 16 | both castled |
| Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation | 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.O-O c6 7.cxd5 cxd5 8.Ne5 Bf5 | 16 | both castled |
| Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation | 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.O-O c6 7.cxd5 cxd5 8.Ne5 Ng4 | 16 | both castled |
| Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation | 3.Nf3 Bg7 4.g3 O-O 5.Bg2 c6 6.O-O d5 7.cxd5 cxd5 8.Nc3 Nc6 9.Bf4 | 17 | both castled |
| Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation | 3.Nf3 Bg7 4.g3 O-O 5.Bg2 c6 6.O-O d5 7.cxd5 cxd5 8.Ne5 Nc6 9.Nc3 | 17 | both castled |
| Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation | 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.O-O c6 7.cxd5 cxd5 8.Ne5 e6 9.Nc3 | 17 | both castled |
| Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation | 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.O-O c6 7.cxd5 cxd5 8.Ne5 Bf5 9.Nc3 | 17 | both castled |
The road to D79
One of the seven named positions on the way are reached by a move order other than their own.
- 1.d4 … 3...Bg7five earlier stops: A40, A45, A50, E60
- 4.g3E60 Fianchetto Variation
- 6...d5D78 Original Defense
- 7...cxd5D79
The position after 7...cxd5
White has brought out the knight on f3 and bishop on g2; Black the knight on f6 and bishop on g7. The c-file is fully open. White is to move and has 32 legal moves.
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| D77 | Neo-Grünfeld Defense: Classical Variation | two squares: c4, c7 |
| D74 | Neo-Grünfeld Defense: Delayed Exchange Variation | three squares: d5, f6, c7 |
| D76 | Neo-Grünfeld Defense: Delayed Exchange Variation | four squares: d5, b6, f6, c7 |
| D75 | Neo-Grünfeld Defense: Delayed Exchange Variation | five squares: b1, c3, c5, d5, f6 |
| E65 | King’s Indian Defense: Fianchetto Variation, Yugoslav Variation | six squares: b1, c3, c4, c5, d5, d6 |
| A39 | English Opening: Symmetrical Variation, Mecking Variation | eight squares: b1, c3, c4, c5, d5, c6, d7, b8 |
| A88 | Dutch Defense: Leningrad Variation, Warsaw Variation | eight squares: b1, c3, c4, d5, f5, c6, d6, f7 |