A75 Benoni Defense: Classical Variation, Argentine Counterattack
A75 holds a single named line. It leaves A74 (Benoni Defense: Classical Variation, Full Line) with 10...Bg4. Black’s pieces and pawns attack six squares in White’s half, level for the most of the 23 Benoni Defense codes. At 20 plies, its reference line is the third-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 | e6 |
| 3 | Nf3 | c5 |
| 4 | d5 | exd5 |
| 5 | cxd5 | d6 |
| 6 | Nc3 | g6 |
| 7 | e4 | Bg7 |
| 8 | Be2 | O-O |
| 9 | O-O | a6 |
| 10 | a4 | Bg4 |
Moves only A75 plays
Same as A78 up to 9.O-O, then:
- 9...a6 The a-pawn advances to a6, covering b5, opening a line for the rook on a8.
- 10.a4 The a-pawn advances two squares to a4, covering b5, opening a line for the rook on a1.
- 10...Bg4 The bishop leaves c8 for g4, opening a line for the queen on d8, attacking the knight on f3.
The road to A75
Three of the ten named positions on the way are reached by a move order other than their own.
- 1.d4 … 8...O-Oeight earlier stops: A40, A45, A50, A61, A70, A72, E10
- 9.O-OA73 Main Line by another order
- 10.a4A74 Full Line by another order
- 10...Bg4A75
The position after 10...Bg4
White has brought out the knight on c3, knight on f3 and bishop on e2; Black the knight on f6, bishop on g4 and bishop on g7. White has a half-open c-file; Black a half-open e-file. White could capture with Bxa6. White is to move and has 36 legal moves.
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| A73 | Benoni Defense: Classical Variation, Main Line | six squares: a2, a4, g4, a6, a7, c8 |
| A76 | Benoni Defense: Classical Variation, Czerniak Defense | eight squares: a2, a4, g4, a6, a7, c8, e8, f8 |
| A72 | Benoni Defense: Classical Variation | ten squares: e1, f1, g1, h1, a2, a4, g4, a6 … |
| A77 | Benoni Defense: Classical Variation, Czerniak Defense, Tal Line | ten squares: a2, d2, f3, a4, g4, a6, a7, c8 … |
| A63 | Benoni Defense: Fianchetto Variation, Hastings Defense | 12 squares: a2, e2, g2, g3, a4, e4, g4, a6 … |
| A64 | Benoni Defense: Fianchetto Variation, Hastings Defense, Main Line | 12 squares: d2, e2, g2, f3, g3, e4, g4, d7 … |
| A79 | Benoni Defense: Classical Variation, Czerniak Defense | 12 squares: a2, d2, f2, f3, a4, g4, a6, a7 … |