E41 Nimzo-Indian Defense: Rubinstein System
E41 holds three named lines, all under the name Nimzo-Indian Defense. It leaves E40, a position of the same name, with 4...c5. That final move, by the c-pawn, covers b4 and d4 and opens a line for the queen on d8. Of all other reference positions, the board of E42 (Rubinstein System, Rubinstein Variation) comes closest, two squares apart.
| # | White | Black |
|---|---|---|
| 1 | d4 | Nf6 |
| 2 | c4 | e6 |
| 3 | Nc3 | Bb4 |
| 4 | e3 | c5 |
Lines filed under E41
All three share their first eight plies, the whole reference line.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| Nimzo-Indian Defense: Rubinstein System | (the shared start itself) | 8 | |
| Nimzo-Indian Defense: Rubinstein System, Hübner Variation | 5.Bd3 Nc6 6.Nf3 Bxc3+ 7.bxc3 d6 | 14 | |
| Nimzo-Indian Defense: Rubinstein System, Hübner Variation | 5.Bd3 Nc6 6.Nf3 Bxc3+ 7.bxc3 d6 8.O-O O-O | 16 | both castled |
Nimzo-Indian Defense: Rubinstein System, Hübner Variation
- 5.Bd3 The bishop leaves f1 for d3.
- 5...Nc6 The knight leaves b8 for c6, opening a line for the rook on a8.
- 6.Nf3 The knight leaves g1 for f3, opening a line for the rook on h1.
- 6...Bxc3+ The bishop on b4 takes the knight on c3, giving check.
- 7.bxc3 The b-pawn takes the bishop on c3, covering b4 and d4, opening a line for the bishop on c1.
Nimzo-Indian Defense: Rubinstein System, Hübner Variation
- 5.Bd3 The bishop leaves f1 for d3.
- 5...Nc6 The knight leaves b8 for c6, opening a line for the rook on a8.
- 6.Nf3 The knight leaves g1 for f3, opening a line for the rook on h1.
- 6...Bxc3+ The bishop on b4 takes the knight on c3, giving check.
- 7.bxc3 The b-pawn takes the bishop on c3, covering b4 and d4, opening a line for the bishop on c1.
The road to E41
- 1.d4 … 3.Nc3three earlier stops: A40, A45, A50
- 3...Bb4E20 Nimzo-Indian Defense
- 4.e3E40 Rubinstein System
- 4...c5E41
The position after 4...c5
White has brought out the knight on c3; Black the knight on f6 and bishop on b4. White could capture with dxc5. White is to move and has 30 legal moves.
Codes that branch off from E41
The reference lines of two other codes leave E41 from the position after 4...c5, each with its own moves.
| Code | Moves | Reference line |
|---|---|---|
| E29 | 5.Bd3 Nc6 6.a3 Bxc3+ 7.bxc3 O-O | Nimzo-Indian Defense: Sämisch Variation |
| E42 | 5.Ne2 | Nimzo-Indian Defense: Rubinstein System, Rubinstein Variation |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| E20 | Nimzo-Indian Defense | four squares: e2, e3, c5, c7 |
| E38 | Nimzo-Indian Defense: Classical Variation, Berlin Variation | four squares: d1, c2, e2, e3 |
| E43 | Nimzo-Indian Defense: St. Petersburg Variation | four squares: c5, b6, b7, c7 |
| E26 | Nimzo-Indian Defense: Sämisch Variation | five squares: a2, b2, a3, c3, b4 |
| A19 | English Opening: Mikenas-Carls, Sicilian | six squares: d2, e3, b4, d4, e4, f8 |
| B14 | Caro-Kann Defense: Panov Attack | six squares: e3, b4, c5, d5, d7, f8 |
| E21 | Nimzo-Indian Defense: Three Knights Variation | six squares: g1, e2, e3, f3, c5, c7 |
Where lines continue from here
Five named lines filed under other codes pass through the position after 4...c5. All of them belong to the codes listed above.