Playing Muller games in a hurry

This work studies the following question: can plays in a Muller game be stopped after a finite number of moves and a winner be declared. A criterion to do this is sound if Player 0 wins an infinite-duration Muller game if and only if she wins the finite-duration version. A sound criterion is presented that stops a play after at most 3n moves, where n is the size of the arena. This improves the bound (n!+ 1)n obtained by McNaughton and the bound n!+ 1 derived from a reduction to parity games.