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It's OK if the position is impossible to reach as long as it's (forward-rules wise) legal, like a board with nothing but 2 kings and queens.

It's OK if the position is impossible as long as it's legal, like a board with nothing but kings and queens.

It's OK if the position is impossible to reach as long as it's (forward-rules wise) legal, like a board with nothing but 2 kings and queens.

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What's the maximum amount of material that a puzzle with unique solution can have?

It's OK if the position is impossible as long as it's legal, like a board with nothing but kings and queens.