Duel creators have the possibility of pressing an "ADD BOT" button on their duels in order to play versus official CSGO500 bots.
Duels are provably fair and no one knows the outcome of the rounds.
After everyone joins, we randomly pick an unmined EOS block from the very near future and use it to generate a duel result as soon as it's mined.
This means that no one (not even us) knows the result of a Duel until after all the participants have joined and the duel is starting.
This guarantees randomness and fairness, even if you're playing against the house.