Action Comics #598 First appearance of Checkmate!

Checkmate is one of my favorite comic book series of all time. I started with knowing nothing about it when I read issue #13 back in '90 I think. Bought it from a used books store, so finding the rest of the issues were hard to find. I finally read the whole series back in 2003! LOL. Then with a little more digging I learned that the series started it's roots in Action Comics #598. At that time I didn't know yet that OAs could be purchased. Looking for this piece I felt hopeless since it's a first appearance, John Byrne Piece, and 30 years old now. BUT, out of the blue a fellow CAF member (Brandon) emailed me saying he saw the piece in the wild but was snatched up already. I tried my luck contacting John's rep and to my surprise he still has it!