how?
Bot v Bot
make 2 tabs of chess.com. go to "play bots" on both of them. select a bot on the first tab, and another on the second tab. make one bot play black, and 1 white. whichever bot is white, look at that, and then play the bot which is black on the other tab, using the move from the first tab. and the bot which is black, once he plays, use that move against the bot on the other tab
Make a bot v bot battle in chess.com or compare them with the same elo bots from other sites