Solve the Move
Find the move that changes the position. Then finish the line.
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Select a piece, then its destination. Arrow keys move around the board; Enter or Space selects. Escape clears your selection. The side you play is always at the bottom.
Read more: Game Theory Reading.
Puzzles: Lichess puzzle database, CC0. Move validation by chess.js (BSD-2-Clause, Jeff Hlywa; license).