Fritz is a commercial chess program, while Stockfish, Deep Blue, and AlphaZero are all computer programs designed specifically for playing chess.

Deep Blue defeated Garry Kasparov in a six-game match in 1997, becoming the first computer program to defeat a world champion.

Stockfish is currently considered to be the strongest chess computer program, based on its performance in various tournaments and matches.

AlphaZero uses a Monte Carlo Tree Search algorithm, which is a type of reinforcement learning algorithm, to play chess.

Stockfish's Elo rating is estimated to be around 3600, which is significantly higher than the rating of any human player.

AlphaZero was developed by Google's DeepMind team in 2017.

Fritz uses its own proprietary chess engine, which is known for its strong positional play and tactical abilities.

Deep Blue was developed by IBM's research team in the 1990s.

Stockfish uses its own open-source chess engine, which is known for its powerful search algorithms and endgame tablebases.

Fritz was developed by the Norwegian company, ChessBase, in the 1990s.

AlphaZero uses its own proprietary chess engine, which is based on a deep neural network.

Fritz is known for its aggressive and attacking style of play, which often leads to exciting and dynamic games.

Deep Blue used its own proprietary chess engine, which was developed by IBM's research team.

Stockfish is known for its strong endgame play, thanks to its extensive endgame tablebases and powerful search algorithms.

Stockfish uses its own open-source chess engine, which is known for its powerful search algorithms and endgame tablebases.