About this opening
Catalan Opening: Open Defense, Classical Line is an opening in the Encyclopedia of Chess Openings,
classified under code E05. ECO group E (E00–E99)
covers Indian defences against 1.d4, covering the Nimzo-Indian, Queen's Indian, King's Indian and Catalan systems. This particular variation is reached
after 10 half-moves from the
starting position, with the move sequence 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3 Be7.
It belongs to the Catalan Opening family.
Within that family this is a level-2 branch (the Open Defense → Classical Line line). The immediate parent line is Catalan Opening: Open Defense, transitioned via 5…Be7.
The opening sequence in prose form: 1.d4 Nf6, 2.c4 e6, 3.g3 d5, 4.Bg2 dxc4, 5.Nf3 Be7. From this position the encyclopaedia records no further canonical continuations — practical play branches into unnamed transpositions or returns to the parent line for alternative ideas.
Use the interactive board above to walk through the moves position-by-position. Click any move in the navigation to step backwards, or use the keyboard arrow keys. For statistical data — how often master-level players have reached this position, White's win-rate, draw frequency, Black's score — see the panel in the right column.
Caissly's coverage of E05 extends through every named sub-variation in this line and across all four locales (English, Spanish, Portuguese, Russian). Where editorial commentary exists for a specific variation it appears as the page body; otherwise the page presents the structural data, board, and statistics as shown here.