A77 Benoni Defense: Classical Variation, Czerniak Defense, Tal Line
A77 holds two named lines, all under the name Benoni Defense. It leaves A76 (Benoni Defense: Classical Variation, Czerniak Defense) with 10.Nd2. Lines filed under A78 reach one of its named positions by a different move order. At 19 plies, its reference line is the fifth-longest of the 23 Benoni Defense codes. Both kings have castled by the end of the reference line, White on move 9 and Black on move 8.
| # | White | Black |
|---|---|---|
| 1 | d4 | Nf6 |
| 2 | c4 | c5 |
| 3 | d5 | e6 |
| 4 | Nc3 | exd5 |
| 5 | cxd5 | d6 |
| 6 | e4 | g6 |
| 7 | Nf3 | Bg7 |
| 8 | Be2 | O-O |
| 9 | O-O | Re8 |
| 10 | Nd2 |
The move that completes A77
The reference line of A79 plays all of these moves and continues beyond them; A77 is the position reached at 10.Nd2.
- 10.Nd2 The knight goes from f3 to d2, opening a line for the bishop on e2.
Lines filed under A77
Both share their first 19 plies, the whole reference line.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Benoni Defense: Classical Variation, Czerniak Defense, Tal Line | (the shared start itself) | 19 | both castled |
| Benoni Defense: Classical Variation, Czerniak Defense, Tal Line | 10...Nbd7 | 20 | both castled |
Benoni Defense: Classical Variation, Czerniak Defense, Tal Line
- 10...Nbd7 The knight leaves b8 for d7, opening a line for the rook on a8.
The road to A77
Two of the 11 named positions on the way are reached by a move order other than their own.
- 1.d4 … 8...O-Onine earlier stops: A40, A45, A50, A56, A60, A65, A70, A72
- 9.O-OA73 Main Line
- 9...Re8A76 Czerniak Defense
- 10.Nd2A77
The position after 10.Nd2
White has brought out the knight on c3, knight on d2 and bishop on e2; Black the knight on f6 and bishop on g7. White has a half-open c-file; Black a half-open e-file. Black could capture with Nxd5, Nxe4, Rxe4. Black is to move and has 36 legal moves.
Codes that branch off from A77
The reference lines of one other code leave A77 from the position after 10.Nd2, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| A78 | 10...Na6 | Benoni Defense: Classical Variation, Czerniak Defense |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| A73 | Benoni Defense: Classical Variation, Main Line | four squares: d2, f3, e8, f8 |
| A69 | Benoni Defense: Four Pawns Attack, Main Line | eight squares: e1, f1, g1, h1, d2, f2, f3, f4 |
| A72 | Benoni Defense: Classical Variation | eight squares: e1, f1, g1, h1, d2, f3, e8, f8 |
| A74 | Benoni Defense: Classical Variation, Full Line | eight squares: a2, d2, f3, a4, a6, a7, e8, f8 |
| A63 | Benoni Defense: Fianchetto Variation, Hastings Defense | ten squares: d2, e2, g2, f3, g3, e4, d7, b8 … |
| A64 | Benoni Defense: Fianchetto Variation, Hastings Defense, Main Line | ten squares: a2, e2, g2, g3, a4, e4, a6, a7 … |
| A75 | Benoni Defense: Classical Variation, Argentine Counterattack | ten squares: a2, d2, f3, a4, g4, a6, a7, c8 … |
Where lines continue from here
Two named lines filed under other codes pass through the position after 10.Nd2. Besides the codes above, they belong to A79.
Other move orders
- Benoni Defense: Classical Variation, Czerniak Defense, Tal Line is also reached inside A78 Benoni Defense: Classical Variation, Czerniak Defense, whose order is 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.e4 Bg7 8.Be2 O-O 9.O-O Re8 10.Nd2.