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Unfortunately, pdfs are not meant to be edited. You can try to use pdftohtml or open office to convert your files to something more usefull. I am not sure if it will work , success depends on how chess diagrams are drawn (is it a picture insert or some custom fonts). I suspect you wont be able to convert your files.
The other approach to improve readability would be cropping pages and making fonts bolder. There are 2 way to do this: convert pdf to an image (see PDFrasterfairian) or edit pdfs themselves (inserting crop commands, replacing fonts). The later can be done by one of multiple pdf editing utilities or Acrobat suite.
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