Caissa Codex
D35

Queen's Gambit Declined: Exchange Variation, Chameleon Variation trainer

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Type a move and press Enter: e4, Nf3, O-O, or from and to squares like g1f3 (e7e8q to promote). The board is also played with the mouse.

Practise the Queen's Gambit Declined: Exchange Variation, Chameleon Variation

Play White's moves of the line from memory — 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. cxd5 exd5 5. Bg5 Be7 6. e3 O-O 7. Bd3 Nbd7 8. Qc2 Re8 9. Nge2 Nf8 10. O-O-O — and the trainer plays Black's replies; "Play the other side" turns it around.

Read about the line, its statistics on Lichess and Stockfish's evaluation on the Queen's Gambit Declined: Exchange Variation, Chameleon Variation page, or pick another opening in the opening trainer.

https://chesscodex.org/train/queens-gambit-declined-exchange-variation-chameleon-variation