This is a just a quick video guide on downloading and installing one of the most powerful chess engines in the world, which also happens to be free!
Stockfish’s latest release, version 7, can be downloaded here.
Actually, it’s unclear whether Stockfish is the number 1 or number 2 engine. Komodo recently beat Stockfish 6, but I don’t believe it has faced off with Stockfish 7. In either case, you don’t really need Komodo unless you plan on playing Carlsen in the coming days (even then, if you can beat Stockfish, you can beat Carlsen–but hey, you’ll never beat either of them!). 😉
If you want instructions on how to get the visual interface that runs the engine, you can find my walkthrough here: http://www.welearnchess.com/how-to-install-a-free-chess-program-on-your-computer/