E64 King’s Indian Defense: Fianchetto Variation, Pterodactyl Variation
E64 holds five named lines, all under the name King’s Indian Defense. It leaves E60 (King’s Indian Defense: Fianchetto Variation) with 4...c5 5.Bg2 Qa5+. White, to move in that position, has seven legal moves, the fewest of the 39 King’s Indian Defense codes. Black’s pieces and pawns attack ten squares in White’s half, the most of the 39 King’s Indian Defense codes. The reference line ends with a check, 5...Qa5+. No other King’s Indian Defense code shares this.
| # | White | Black |
|---|---|---|
| 1 | d4 | Nf6 |
| 2 | c4 | g6 |
| 3 | Nf3 | Bg7 |
| 4 | g3 | c5 |
| 5 | Bg2 | Qa5+ |
Moves only E64 plays
Same as D74 up to 4.g3, then:
- 4...c5 The c-pawn advances two squares to c5, covering b4 and d4, opening a line for the queen on d8.
- 5.Bg2 The bishop leaves f1 for g2, opening a line for the rook on h1, guarding the rook on h1.
- 5...Qa5+ The queen goes from d8 to a5, guarding the pawn on c5, giving check.
Lines filed under E64
All five 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 |
|---|---|---|---|
| King’s Indian Defense: Fianchetto Variation, Pterodactyl Variation | 3.Nf3 Bg7 4.g3 c5 5.Bg2 Qa5+ | 10 | check |
| King’s Indian Defense: Fianchetto Variation, Yugoslav System | 3.Nf3 Bg7 4.g3 d6 5.Bg2 O-O 6.O-O c5 | 12 | both castled |
| King’s Indian Defense: Fianchetto Variation, Yugoslav Variation, Rare Line | 3.g3 Bg7 4.Bg2 O-O 5.Nc3 d6 6.Nf3 c5 | 12 | Black castled |
| King’s Indian Defense: Fianchetto Variation, Hungarian Variation | 3.Nf3 Bg7 4.g3 d6 5.Bg2 O-O 6.O-O Nbd7 7.Nc3 a6 | 14 | both castled |
| King’s Indian Defense: Fianchetto Variation, Double Fianchetto Attack | 3.Nf3 Bg7 4.g3 d6 5.Bg2 O-O 6.O-O Nbd7 7.Nc3 e5 8.b3 | 15 | both castled |
The road to E64
One of the six named positions on the way are reached by a move order other than their own.
- 1.d4 … 2...g6four earlier stops: A40, A45, A50, E60
- 3.Nf3E60 King’s Knight Variation by another order
- 4.g3E60 Fianchetto Variation
- 5...Qa5+E64
The position after 5...Qa5+
White has brought out the knight on f3 and bishop on g2; Black the knight on f6 and bishop on g7.
Codes that branch off from E64
The reference lines of one other code leave E64 from the position after 6...c5, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| E65 | 7.Nc3 | King’s Indian Defense: Fianchetto Variation, Yugoslav Variation |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| A87 | Dutch Defense: Leningrad Variation | six squares: a5, c5, f5, c7, f7, d8 |
| D73 | Neo-Grünfeld Defense: with g3 | six squares: a5, c5, d5, c7, d7, d8 |
| A31 | English Opening: Symmetrical Variation, Anti-Benoni Variation | eight squares: f1, g2, g3, a5, g6, g7, d8, f8 |
| A38 | English Opening: Symmetrical Variation, Full Symmetry Line | eight squares: b1, d2, c3, d4, a5, c6, b8, d8 |
| A37 | English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | ten squares: b1, d2, c3, d4, a5, c6, f6, b8 … |
| A49 | Indian Defense: Przepiorka Variation | ten squares: f1, c2, g2, c4, a5, c5, c7, g7 … |
| A56 | Benoni Defense | ten squares: f1, g1, g2, f3, g3, a5, g6, g7 … |
Other move orders
- King’s Indian Defense: Fianchetto Variation, Yugoslav System is also reached inside E65 King’s Indian Defense: Fianchetto Variation, Yugoslav Variation, whose order is 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 O-O 5.Bg2 d6 6.O-O c5.