Thank you for the feedback!
Metaltubbie you're right, I should have neatened up the board lines/squares, but I made the map in two evenings (including the time taken to download Inkscape over a painfully slow internet connection) and I was more excited by the concept than making it neat (next version will be better!).
Unfortunately I couldn't work out how to get my friends in to a test game, so before publishing it I had only played a couple of games against AI. I see now that the bonuses are too unequal, and there should be others ('Pair of Rooks', 'All the Rooks', 'All the Knights' etc etc). I can also see how White is a little disadvantaged by the layout!
The connection lines are a bit confusing, I tried to lay them out in the least confusing way though. At first I wasn't going to have ANY connection lines, and people would have had to rely on their chess skills to work them out!
The good thing about the basic idea though is that there is an enormous number of possible layouts, and the interesting thing is working out which also make good Warlight maps.
* More bonuses
* Neater board
* Clearer connection lines
* Chess notation markers (1-8, A-H)
Possible ideas for the future:
* Positions from famous games (suggestions, anyone?)
* Three-way chess map (http://i215.photobucket.com/albums/cc149/puturani/loose/3%20way%20chess/12.jpg
* Would be nice if you could set up one-way connections and replicate just the possible chess-legal moves.