ECO D50

Queen's Gambit Declined: Been-Koomen Variation

Queen's Gambit Declined: Been-Koomen Variation is a chess opening classified under ECO D50. Its defining line here is 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5.

Queen's Gambit Declined: Been-Koomen Variation — board position♜♞♝♛♚♝♜♟♟♟♟♟♟♞♟♟♝♟♟♞♟♟♟♟♟♟♜♛♚♝♞♜

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5

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The diagram shows the position after 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5. Play through it move by move in the interactive explorer.

Opening name, ECO code, and main line come from the Lichess open chess openings dataset.

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