E00 Catalan Opening
Also filed here: Indian Defense.
E00 holds six named lines from two openings, most of them (three) under Catalan Opening. It leaves A50 (Indian Defense: Normal Variation) with 2...e6 3.g3. Lines of 13 other codes continue from its position, the widest spread of the 10 Catalan Opening codes. At five plies, its reference line is the shortest of the 10 Catalan Opening codes. Black, to move in that position, has 28 legal moves, level for the fewest of the 10 Catalan Opening codes.
| # | White | Black |
|---|---|---|
| 1 | d4 | Nf6 |
| 2 | c4 | e6 |
| 3 | g3 |
The move that completes E00
The reference line of A62 plays all of these moves and continues beyond them; E00 is the position reached at 3.g3.
- 3.g3 The g-pawn advances to g3, covering f4 and h4, opening a line for the bishop on f1.
Lines filed under E00
All six share the start 1.d4 Nf6 2.c4 e6 and then split four ways at White’s move 3.
| Name | After the shared start | Plies |
|---|---|---|
| Catalan Opening | 3.g3 | 5 |
| Indian Defense | 3.Qb3 | 5 |
| Indian Defense: Devin Gambit | 3.g4 | 5 |
| Indian Defense: Seirawan Attack | 3.Bg5 | 5 |
| Catalan Opening | 3.g3 d5 | 6 |
| Catalan Opening: Hungarian Gambit | 3.g3 e5 | 6 |
The road to E00
- 1.d4one earlier stop: A40
- 1...Nf6A45 Indian Defense
- 2.c4A50 Normal Variation
- 3.g3E00
The position after 3.g3
Black has brought out the knight on f6; White has not yet moved a knight or bishop.
Codes that branch off from E00
The reference lines of two other codes leave E00 from two of its named positions; “From” gives the last part of that position’s name.
| Code | From | Moves | Reference line |
|---|---|---|---|
| A62 | Catalan Opening | 3...c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.Bg2 Bg7 8.Nf3 O-O | Benoni Defense: Fianchetto Variation |
| E01 | Catalan Opening | 4.Bg2 | Catalan Opening: Open Defense |
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| A51 | Indian Defense: Budapest Gambit | four squares: g2, g3, e5, e6 |
| A86 | Dutch Defense: Fianchetto Variation | four squares: f5, e6, e7, f7 |
| A90 | Dutch Defense: Classical Variation | four squares: f1, g2, f5, f7 |
| E02 | Catalan Opening: Open Defense | four squares: f1, g2, c4, d7 |
| E10 | Indian Defense: Anti-Nimzo-Indian | four squares: g1, g2, f3, g3 |
| E15 | Queen’s Indian Defense: Fianchetto Variation | four squares: g1, f3, b6, b7 |
| A32 | English Opening: Symmetrical Variation, Anti-Benoni Variation, Spielmann Defense | five squares: g1, g2, g3, d4, c7 |
Where lines continue from here
Besides the codes above, they belong to A63, A64, E02, E03, E04, E05, E06, E07, E08, E09, E11.