Andy Dingley wrote:
On Mar 21, 12:15 pm, dog-man wrote:

I tried using a fine jigsaw blade but it still chips the plinth
somewhat.

Blades help a lot. Not just small teeth, but anti-chip shaped teeth
(Bosch 101B) and a new, sharp blade. Even better is a "reverse" tooth
blade (Bosch 101BR) that cuts on the downstroke. Make sure any
pendulum action is switched off. If your jigsaw has an anti-plinter
plate (tiny gap round the blade), then use that, although they're not
a great help on chipboard.

[snip]

I prefer to use the blade design that is similar to a pruning saw or one of
the Japanese saws designed for cabinet work. These have no set on the teeth
and produce a clean cut on both sides of the cut. They cut on both the up
and down stroke and create the least splintering that I have seen even in
difficult materials such as chipboard.

http://www.starrett.co.uk/shop/jigsaws/dualcut/

Or similar.