Chessmaster 9000 used to have an option for an engine to play against itself. Is there anything online like this available for free (or a small fee)?
https://github.com/rooklift/nibbler
https://banksiagui.com/
https://sourceforge.net/projects/scid/
http://www.playwitharena.de/
https://www.chessprogramming.org/GUI
Thank you!
Also, you could just use the Analysis Board and press the spacebar for Stockfish to make the best move. The GUIs that @Toscani has recommended could help with having other engines play against themselves, too.
tcec-chess.com
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