At Schachcomputer.info there is an explanation on how to check which version of Fidelity Chess Challenger “10” you might have.
With Chess Challenger “10” playing White, when opening with the Queen’s pawn to d4. You playing as Black, can now force the following responses:
- d4 d5
- c4 c6
After you have played 2. ... c6 as Black, the two Chess Challenger 10 versions will differ in their next move:
- VERSION A PLAYS: 3. Nc3
- VERSION B PLAYS: 3. Ng3
The above picture shows both versions.