Mixing chains

+1 - it's one of the cheapest, but most important bits of the bike. Taking risks and bodging on chains is stoopid.

Although I've done this and it works you are wrong since it does compromise the chain strength. Freewheel it's less of an issue but riding fixed, chain strength is far more important. As I've said again and again.. £10 for a new chain versus £2500 for teeth.. your call.