For a zugzwang where x>y and:
- If white has the move, White can force checkmate in x full moves
- If Black has the move, White can force checkmate in y full moves
The score of such a zugzwang is x-y. What is the maximum possible score? I know of a position with score 84-25=59.
[Title "WTM wins in 84, BTM loses in 25 "]
[FEN "8/8/8/3k2P1/4pKP1/8/8/8 w - - 0 1"]