I finally managed to get my hands on a DVD of a Tcherniakov production. It’s a 2008 Berlin performance of Prokofiev’s The Gambler. It’s also on the usually appalling Kultur label and, true to form, it’s unwatchable. The sound is very poor Dolby 2.0, on a 2008 recording, stone the crows etc! Worse the subtitle encoding (English only) is very weird. My Blu-ray player won’t show them and nor will Apple’s DVD player. Vlc will play them but sod it it if I’m going to sit in the computer room for 135 minutes with manky sound and a relatively small screen. Not acceptable at all. Grrr!