The goal of all chess puzzles is to checkmate your virtual opponent no matter what moves they make (i.e. a forced mate),
in the requested number of moves. Some chess puzzles are created from actual chess games played online, and some are purely
composed chess problems, sometimes even with positions that cannot be reached in a real game of chess.
All chess puzzles are automatically verified, so all solutions are guaranteed to be correct and complete. However,
there is always a chance that a shorter solution exists, so if you believe you found a better solution to any of the chess puzzles,
please use
Options → Another solution in the bottom right corner of the puzzle window to enter it.
— puzzle is excluded from the main list because it has several alternative solutions
— puzzle will be automatically deleted because of too many alternative solutions (10+)
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Improved by: slugrico (mate in 3) 
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Black to move, mate in 2
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