Every move you make must be one of the longest available this turn: no legal move may travel farther (in king-steps) than the one you pick.
Grandstandingis one of Nerf Chess's secret handicaps. In Nerf mode you choose one of two nerfs before the first move, in secret, and carry it for the whole game.
The board quietly enforces it: any move it forbids is simply never offered, so you cannot break it by accident. Your opponent never sees which nerf you took until the game ends, so every move you make is also a clue they are trying to read.
“Why walk when the crowd wants to see you fly?”
Affects your kings.