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All answers having "Chess piece" as clue:

3 Character Answers:

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MAN



4 Character Answers:

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KING

PAWN

ROOK



5 Character Answers:

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QUEEN



6 Character Answers:

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BISHOP

CAPTOR

CASTLE

KNIGHT



7 Character Answers:

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BRAKING



9 Character Answers:

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REINFORCE



11 Character Answers:

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BLACKCASTLE