ecocodes
Volume A · Flank openings‹ A65A67 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

A66 Benoni Defense: Pawn Storm Variation

A66 holds two named lines, all under the name Benoni Defense. It leaves A65 (Benoni Defense: King’s Pawn Line) with 6...g6 7.f4. That final move, by the f-pawn, covers e5 and g5. Of all other reference positions, the board of A67 (Taimanov Variation) comes closest, four squares apart.

Score sheet
#WhiteBlack
1d4Nf6
2c4c5
3d5e6
4Nc3exd5
5cxd5d6
6e4g6
7f4

Lines filed under A66

Both share their first 13 plies, the whole reference line.

NameAfter the shared startPlies
Benoni Defense: Pawn Storm Variation(the shared start itself)13
Benoni Defense: Mikenas Variation7...Bg7 8.e515

Benoni Defense: Mikenas Variation

  1. 7...Bg7 The bishop leaves f8 for g7, opening a line for the rook on h8, guarding the rook on h8.
  2. 8.e5 The e-pawn advances to e5, covering d6 and f6, attacking the knight on f6.

The road to A66

  1. 1.d4 … 3.d5four earlier stops: A40, A45, A50, A56
  2. 3...e6A60 Modern Variation
  3. 6.e4A65 King’s Pawn Line
  4. 7.f4A66

The position after 7.f4

White has brought out the knight on c3; Black the knight on f6. White has a half-open c-file; Black a half-open e-file. Black could capture with Nxd5, Nxe4. Black is to move and has 33 legal moves.

WhiteBlackMaterial (pawn units)3838Minor pieces developed11Moves spent on pawns65Pawns on d4, e4, d5, e520Squares attacked in the other half95not castlednot castled

Codes that branch off from A66

The reference lines of two other codes leave A66 from the position after 7.f4, each with its own moves.

CodeMovesReference line
A677...Bg7 8.Bb5+Benoni Defense: Taimanov Variation
A687...Bg7 8.Nf3 O-OBenoni Defense: Four Pawns Attack

Closest boards in other codes

CodeLineDiffers on
A70Benoni Defense: Classical Variationfour squares: g1, f2, f3, f4
A61Benoni Defensesix squares: g1, e2, f2, f3, e4, f4
B09Pirc Defense: Austrian Attacksix squares: c2, d4, c5, d5, c7, e7
B71Sicilian Defense: Dragon Variation, Levenfish Variationsix squares: g1, c2, d4, c5, d5, e7
A71Benoni Defense: Classical Variation, Averbakh-Grivas Attackeight squares: c1, g1, f2, f3, f4, g5, g7, f8
B70Sicilian Defense: Dragon Variationeight squares: g1, c2, f2, d4, f4, c5, d5, e7
B82Sicilian Defense: Scheveningen Variation, Matanovic Attackeight squares: g1, c2, d4, c5, d5, e6, g6, g7

Where lines continue from here

Seven named lines filed under other codes pass through the position after 7.f4. Besides the codes above, they belong to A69.

Volume A

  1. 00
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  99. 98
  100. 99

Open this line in the finderAll Benoni Defense codes