It can be done with your chain saw, but cut a guide groove first!
It may pay to use a new chain though - if your old one isn't perfectly sharpened the saw may wander off track......not so important across the grain!
John
be very careful as cross cuts you have to be unlucky to hit something like an old nail but on a cut along the length you will definately hit it if there is anything in there.
Personally i have done it with a circular saw before from both sides. Thats much easier if you have a big enough one.
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