E30 Nimzo-Indian Defense: Leningrad Variation
E30 holds two named lines, all under the name Nimzo-Indian Defense. It leaves E20 (Nimzo-Indian Defense) with 4.Bg5. That final move, by the bishop, opens a line for the rook on a1 and the queen on d1 and attacks the knight on f6. Of all other reference positions, the board of D39 (Queen’s Gambit Declined: Ragozin Defense, Vienna Variation) comes closest, four squares apart.
| # | White | Black |
|---|---|---|
| 1 | d4 | Nf6 |
| 2 | c4 | e6 |
| 3 | Nc3 | Bb4 |
| 4 | Bg5 |
Lines filed under E30
Both share their first seven plies, the whole reference line.
| Name | After the shared start | Plies |
|---|---|---|
| Nimzo-Indian Defense: Leningrad Variation | (the shared start itself) | 7 |
| Nimzo-Indian Defense: Leningrad Variation, Averbakh Gambit | 4...h6 5.Bh4 c5 6.d5 b5 | 12 |
Nimzo-Indian Defense: Leningrad Variation, Averbakh Gambit
- 4...h6 The h-pawn advances to h6, covering g5, opening a line for the rook on h8, attacking the bishop on g5.
- 5.Bh4 The bishop goes from g5 to h4, attacking the knight on f6.
- 5...c5 The c-pawn advances two squares to c5, covering b4 and d4, opening a line for the queen on d8.
- 6.d5 The d-pawn advances to d5, covering c6 and e6, opening a line for the queen on d1.
- 6...b5 The b-pawn advances two squares to b5, covering a4 and c4, opening a line for the bishop on c8.
The road to E30
- 1.d4 … 1...Nf6two earlier stops: A40, A45
- 2.c4A50 Normal Variation
- 3...Bb4E20 Nimzo-Indian Defense
- 4.Bg5E30
The position after 4.Bg5
White has brought out the knight on c3 and bishop on g5; Black the knight on f6 and bishop on b4. Black could capture with Bxc3+. Black is to move and has 32 legal moves.
Codes that branch off from E30
The reference lines of one other code leave E30 from the position after 4.Bg5, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| E31 | 4...h6 5.Bh4 c5 6.d5 d6 | Nimzo-Indian Defense: Leningrad Variation, Benoni Defense |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| D50 | Queen’s Gambit Declined: Modern Variation | four squares: b4, d5, d7, f8 |
| D53 | Queen’s Gambit Declined | four squares: b4, d5, d7, e7 |
| E21 | Nimzo-Indian Defense: Three Knights Variation | four squares: c1, g1, f3, g5 |
| E22 | Nimzo-Indian Defense: Spielmann Variation | four squares: c1, d1, b3, g5 |
| E24 | Nimzo-Indian Defense: Sämisch Variation | four squares: c1, a2, a3, g5 |
| E32 | Nimzo-Indian Defense: Classical Variation | four squares: c1, d1, c2, g5 |
| E40 | Nimzo-Indian Defense: Rubinstein System | four squares: c1, e2, e3, g5 |
Where lines continue from here
One named line filed under other codes passes through the position after 4.Bg5. It belongs to the code listed above.