"A Long Walk Off a Short Peer" refers to the Short vs. Timman chess match that took place in Tilburg, Nederland (1991) during the Interpolis 15th Tournament.
While King walks are not unheard of in chess, but the seemingly out-of-the-blue advance of Nigel Short's king with 31.Kh2!!, 32.Kg3!!, 33.Kh4!!, and 33.Kg5!! intending 34.Kh6!! with mate on g7 is unique in the annals of chess.