With a friend or many chess engines (CECP and UCI protocols are supported). The public domain Chess Engine Gull 3 is included.
Caïssa Board is very easy to use and setup. It provides the features you need for playing and reviewing your games without entering into complex details.
You can load PGN files and review games played in the past. Naturally you can also export your game or your position to share them with friends or study them with other applications (websites, chess apps, ...)
Caïssa Board will show you tactical moves such as forks, pins, discovered attacks and also controlled squares.