Cyrus is one of the most feature-rich games I've ever seen on a #PCjr. (You are back on #PCjr Mastodon.) I tried to beat six different old computer Chess games during the worst of the pandemic and lost to all of them, so I have not tried a full game of Cyrus yet. Yet!
But it has features like 2D and 3D viewing, board "rotation" in 3D view, a clock, a CPU vs CPU mode, game analysis and other options. I can't think of another PCjr game that thought of EVERYTHING like Cyrus.