zug·zwang (tsōōk'tsväng') n. A situation in a chess game in which a player is forced to make an undesirable or disadvantageous move.
[German Zugzwang : Zug, pull, move (from Middle High German zuc, pull, from Old High German, from ziohan, to pull; see deuk- in Indo-European roots) + Zwang, compulsion (from Middle High German twanc, from Old High German).]