The Mac Chess app plays very strong and never loses material in multiple games that I've played.

The computer was set to play at 256 seconds per move. The original program was written by Gian Carlo Pascutto. Before macOS Big Sur update, the original program (written by Gian Carlo Pascutto) was not as strong as it is now. The Apple version of Sjeng is a lot stronger than the original version (MacOS X version by Gian Carlo Pascutto). On the easiest level, the bot is playing at an elo of at least 2000+. On the higher settings, the computer is playing at its highest difficulty which is 3000 elo. The Mac Chess app is only 200 elo points weaker than Chess.com's Maximum Engine. The Komodo engine on Chess.com can achieve a staggering rating of 3200 elo at its highest setting.