Stockfish is an open-source project, sharing and freely distributing the code, tools and data needed to deliver this chess engine. We do this because we are convinced that open software and open data are key ingredients to make rapid progress, and thus for the benefit of our users. The recent progress in playing strength of Stockfish confirms the path taken. We proudly provide the tools for free chess analysis to millions of users, with countless titled players using Stockfish for their prepa...| Stockfish Blog on Stockfish - Strong open-source chess engine