You will see sequences of moves and 4 options. Pick the opening or variation these moves are the start of.
Example: 1. d4 d5 2. c4 → Queen's Gambit
The opening names come from the Lichess Openings Dataset and should be the same as those displayed on Lichess.
The easy mode has the 50 most common openings and variations, the medium mode the 300 most common, and the hard mode all the variations played more than 1000 times on Lichess in Feb. 2024.
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