ok i ended up tying him because i made an ameture mistake right at the end. anyway the best way i found was trading. trade queens asap then trade bishops, knights etc whenever you can. he doesnt touch his rooks until he absolutely has to. once youve traded your knights and bishops attack with your rooks. when you do make sure its safe before you do (that was my mistake) but then attack hard and fast, once you start dont let up or he will take advantage of it if you do. good luck yall
Help beating Nelson (computer)

an important thing to notice about Nelson is that he hangs a lot of pieces. i've noticed in the bots from Martin all the way to Nelson they hang an unreasonable amount of pieces for their supposed elo rating. Antonio is when you have to start really being careful.

Once you gain the piece advantage on him, make tons of trades so by the endgame you'll have the easiest time ever.

I just made a video on how to beat Nelson: https://www.youtube.com/watch?v=S60lCFz9gI4&t=379s
I hope that this helps.

Just don't fall for the traps, defend everything under attack, counterattack him, and you will crush him. Here is a game I played against him.
to be honest what I do was doing a discovering his queen, I don't know if he always bugs when his queen is discovery but it's it
Yeah I had a hard time beating Nelson until I heard to just do a queen swap early and develop your pieces as fast as you can. After that you just have to play decent chess.