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What is a Legal Cluster?

Philippe Schnoebelen, 13 Apr 1995

Original problem 6638 from feenschach asks to add some given men to the
diagram position so that we get a "white legal cluster". I know what is an
illegal cluster but not what is a legal cluster. Who can help ?

Peter van den Heuvel, 13 Apr 1995

A legal cluster is a legal position that becomes illegal if one
removes one piece. I guess a white legal cluster is a legal
position that becomes illegal if one removes a white piece.