Sam Wanamaker Playhouse, LondonChekhov's claustrophobic drama is perfectly suited to this intimate venue, with moments of humour leavening the heartbreak The flowers spelling out Irina's name make this party feel like a funeral. It's an appropriate choice for Caroline Steinbeis's bluntly sullen, occasionally sharp-tongued production of Chekhov's unhappy family drama. Focus is scattered in this first Chekhov play to b…