Whamgammon appeared in the Winter 2006 edition of the Crusader Magazine by Troll Lord Games. Soon we hope to have a PDF version avaiable online. Until then, to get it, you must either buy a copy of the magazine from them, or order it direct from me (see my STUFF page).
Whamgammon is a wierd Backgammon Variant with lots of strange new rules, most of which include combat for the control of the spaces.
IMPORTANT CORRECTION to the rules as printed in the Crusader: Both the Summoner and the Engineer roll 2 dice when able to roll in combat (not 1 as printed) and neither has a bonus.