[pashamur]

AlphaZero / LeelaChess - neural net / genetic learning based ones; although they're not really commercially available, technically anyone can download the code to LeelaChess and train it if given enough CPU power. They learn chess by repeatedly playing chess against itself and in such a way simulate the organic development that has occurred in human play as well.

That's the next generation of chess engines - AlphaZero trounced Stockfish in a match of 100 games with 28 wins and 72 draws and not a single loss. And if you decrease the power a little bit (take an earlier generation), it makes significantly more human-like moves than Stockfish.