The game would never end, then. The win condition is challenging when a move is the best move. It’s similar to games of deception. You WANT the person to think you made the best move without actually making it, because if they challenge and are wrong, you win.
Because you win by your opponent making the top move (and you correctly calling it).
But I assume the top-level commenter meant make winning exactly like conventional chess - just neither party can use the top moves to get there. You could even start from move 1 instead of 2 too, take the best openings off the table.
