At the risk of sounding like major sour grapes - and trying to be fair! - I don't think much of a couple of the extracts. One has a good 'concept', but the writing is pretty pedestrian, and one I just don't think is good as either a synopsis or extract, and I think the prose and pacing are problems.
Trying to see what the judges were going for - one YA, one historical, one (sort of?) psychological thriller, one period literary-biographical, one contemporary/historical split time scheme (not entirely sure how you would categorise it)? Do judges of this kind of comp generally look for a 'spread' of genres? So, for instance, if they got a big intake of really good YA, say, they could still only shortlist one?
If anyone's interested, you can read the extracts and synopses of the shortlist here:
www.lucy-cav.cam.ac.uk/fictionprize/previous-shortlists/2015-shortlist/
Would be interested in whether people see qualities that I'm not seeing!