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I have used what I believe to be the "birth year" and I think I have may have sussed what you have to do to add in base 12 (although I am not totally confident!) However the bottom line gives me the correct middle four letters but not the 'P' at the beginning or the 'T' at the end. Where am I going wrong? Am I totally up the wrong creek?

thepost - you need P/G and T/N.

I think i know what should be in the final grid but the additions in Base 12 do not seem to work out fully. For the first column of the six letter entries I have S+S+A+W which should produce P on addition in Base 12 - but it doesn't. (I have S=1, A=5, W=2). For the final column of the six letter entries I have G+R+N+R which should produce T on addition - but again does not. As I said earlier maybe I am doing Base 12 sums wrongly - yet I have RIES for the middle four columns. Or am I wrong in assuming that SUMI=1678?

thepost - I think you are doing your addition wrong. 1678 is correct by the way. Start with the right column and G = 0 + R = 9 + N = 10 + R = 9 gives 28. In base 12 this comes to 24 + 4. The 4 = T. Carry the 2 into the next column, continue working right to left and everything should work! Good luck.

Unclued - many, many thanks! Indeed I was doing the summing wrongly. I was treating each column individually instead of doing it as a whole (as I would do in base 10).

I actually had the grid completely filled correctly but it was niggling me that I could not verify the mathematics.

Again - thanks.