using chess960 to measure hability in multisports

Hi, all.

I'm trying use chess (in fact, chess 960) in a multisport competition. In my opinion, lichess IS THE BEST WAY to do it.
However, I noticed AI uses random decisions - usual to AI's (I tested it by using undo button - each time, the AI chooses a different move).
Is there a feature to break this random decision?
So, if two different competitors play the same move (!), the AI will play the same game to two players.

Thanks.
Cézar Freitas

Play a stronger AI level. Low level AIs are only weak because they are forced to throw in bad/random moves.

Thanks, Clarkey. I supposed that. Nice.

But the players are amateurs - If them play in stronger levels almost all of them will lose - so I couldn't compare chess performance to another sport (like run 100m or distance jump). I thank suggestions of everybody.

Thanks.

If you want something to be exactly the same for every competitor, I would do a series of mating puzzles. These can be set up to respond precisely with all the best moves, and if the player does the wrong move, fail them.

Better yet, do a series of 3 forced win endgames in which the player must only play precisely to win. The computer can be on maximum level since it's already a lost game, but of course then if the player makes the wrong moves, it will still play precisely and therefore would always respond with the same move.