Having just received mine, I vouch for the chess set not having a few extras, but actually TONS!
I got mine second hand (from a member here) and it came half assembled, so I just spent several hours the other day sorting, and I believe the + 2600 piece count. It also seems to have a large amount of the parts we castlers enjoy (slopes, inverted slopes, headlights, weapons, shields, etc.) and is mostly brickbuilt so there's plenty of MOC fodder for all purposes, in several colors.
I know that with my new color bucket with all the pieces from a dwarf mine, couple jousts, and 2 skelly ships, plus the chess set, I can now do something grandish if I ever find a month off work, and that's primarily the chess set's fault.
To heck with KKII, just go get a chess set man,
When I was a lad my mother told me that if I stood around all day with my mouth open a weasel was liable to mistake it for his den and jump right in. If you have something to say, say it, otherwise, beware of weasels.