He composed chess problems since 1977. He has gained distinctions including the first prizes in many chess composition tourneys, often in coauthorship with IM Juraj Brabec. This composing duo pioneered many complex themes in fairy twomovers, working usually in a way Brabec proposing the scheme and Lehen developing it in the artistically satisfactory manner. In 2005 he became a FIDE master of chess compositions.FIDE-Masters for chess compositions saunalahti.fiHandbook of Chess Compositions Pdf saunalahti.fi
