In younger years I found it on a German junk market. A very big PD-Software dealer for sell it for 5 German DM. I gave it to Gambit-Soft and Gambit-Soft started a selection for such programs.

Very strong and good DOS grafic at this time.
Nice fights vs. first MChess, Psion and RexChess versions.
RexChess 2.3 vs. Now 0.1 ... or Zarkov 2.5 vs. Now 0.1 ... great matches. I have all games I produced ... also ...
ChessChallenger 7 CL1 vs. ChessChallenger 7 CL2, CL3, CL7, CL6 (six minutes) or CL4 (20 minutes). Self Play are possible with a secret not documented Option.
Each chance for such games since the beginning I am using.
Now 0.1 are very positional and at this time not bad in endgames. RexChess too and also Psion. Only Zarkov Comes with a bit more tactical power. But often Zarkov 2.5 have bigger Problems in late middlegame vs. Now 0.1.
With 10 People we played such matches in the UNI in the town I life at this time. With a beer and of course without womens we had a lot of fun.
Thanks for it, was a nice time.
Best
Frank