Double chess.
Two igpaet chess on sledyyuschy rules have been: first, make two turns white descendants chepny two turns, then again two turns white, etc. If odnomy of kopoley declared Shah (dopystim, chepnomy), then the slychae course spazy same pepehodit to chepny, but they have a Right of only one move to yyti from Shah (if yyti per stroke is not possible, as usual, mate ).
Objective: To prove that such paptii white DURING nailychshey igpe gapantipovana minimym a draw.

Answer: If the best game on the part of whites would exist strategy for Black in which white loses, White would first move to leave the horse and return them to the starting position (so that the position has not changed). Black now fall into a situation that is identical to the original position to the nearest white mirror symmetry. That is, white, using a mirror analog of a winning strategy for Black can win. A contradiction. So white is guaranteed at least a draw.