Retro Clock This is a design due to NDE which is so original that it requires its own category. The basic idea is a retroclock which must be relieved before the Black king runs out of moves. White cannot uncapture a unit because all are accounted for. 7B/6PP/5P2/4N1PB/5QN1/1P3RPk/5P1P/5RK1 w - - id #020 (16+1) NDEvAGB LM?;