The Irish experimental theater company Dead Centre is taking a wrecking ball to Chekhov’s unwieldy five-hour play Platonov (also known as Untitled Play) with its new metatheatrical work, Chekhov’s First Play. Devised and directed by Bush Moukarzel and Ben Kidd, this 70-minute production is a radical reworking of the original four-act drama, playfully magnifying its follies and the overreach of its young playwright, who penned it before he was 20.