Way back when, Hans worked for IBM. I met him at an IBM data center one time, but he worked in the Federal division and just used the center for a demo. I had known him from the Washington Chess Divan earlier.
I know he had done a computer program to help with chess. It was the first as far as I can tell. This was in the days when the s/360 was ruling the market, and there were no PCs; and pdp8s and the like were not up to the job although they did cause IBM a lot of grief by their cheap price and what they could do for small special purpose jobs.
The question I always had was did Hans use the IBM computers to assist his game when he won the ICCF world championship?
I know that Hans was very good as a player, but was he THAT good that he could have won the ICCF world championship without the computer's help?
It is certainly possible, but having a really good computer analysis on some tough positions had to be helpful.