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We do have knight relay chess I see but not relay chess. That is any piece inclu. the king that is protected by another piece can move either as the piece protecting it or use it own moves.
small example from the beginning position the knights both can move as rooks or as knights.
(do skréše) Nebavi tě prokósávat se na oblébeny léstke přes dvě, tře bóchnuti do meše? Cálojici členi mužó šópnót jaké léstek chcó do kontextovy nabidke. (pauloaguia) (okázat šecke vechetávke)