I don't really use many submission chains. I'm much more interested in making the first one work, and it usually does. Probably the only pseudo-chains I use are threatening the cross collar from mount to expose the arm for an armbar, bow & arrow to armbar from the back, and...well, that's about it. I do hit chains from time to time, but those are probably the only two I consistently chain. In general if I have to go to a second sub it's because I've done the first one wrong. I don't want to catch people at the end of a chain so much as dominate them and take the submission in a way they can't hope to stop.