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While the outcome of such positions is rather obvious the exact distribution of the DTZ values may still be of theoretical interest.

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How to use Syzygy tablebases programmatically?ДЄs a developer you may be interested in probing tablebases via a public HTTP API (feel free to suggest improvements), in C with the original probing code or a library (currently 6 piece only), in C++ by adjusting Stockfish, in Python or in Rust.

Currently the development version of Stockfish is required for 7-piece tablebase support. You can separate multiple paths with on Windows or : on Unix-based systems.

(original source of 7-piece tables, China)ДЇinally set the SyzygyPath option in Stockfish.

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Then download the tables from one of the mirrors.

They are optional, but required to reliably convert complicated endings.ДЇirst check how much disk space you have or you want to use. WDL tables should be stored on the fastest disk (preferably SSD) you have.ДTZ tables (*.rtbz) tell the engine how to finish the endgame once it is on the board. An engine will use this very frequently to decide which endgames to aim for. WDL tables (*.rtbw) store the outcome of positions, e.g. The tablebase comes in seperate tables, 2 files per material configuration.

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How to use Syzygy tablebases offline with Stockfish? This is much more compact than the proprietary 100 TB Lomonosov tablebases. Syzygy tablebases store all their information in 18.4 TB, so at around 0.35 bits per position. There is also a list of longest endgames with basic stats for each material configuration. Here it takes 656 half-moves to arrange a winning pawn advance. Surprisingly this extension is even required for endgames with pawns. This requires a small extension to the Syzygy table format: With 6-piece endgames 8 bits were sufficient for the largest entry in the DTZ map. In this position (already discovered 2012 by the Lomonosov team) Black can hold on for 1034 half-moves until White manages to make a winning capture. The project was completed today, after exactly 5 months. He also fixed any other issues that occured while generating 7-piece tables. Half-way into the process, Ronald de Man (the original author of the Syzygy tablebase generator) managed to significantly speed up generation of pawnless tables by making it NUMA-aware. You can read up on the technical discussion here and here. What did it take to generate the tables?Д«ojun Guo (also one of the top contributors of computing power for Stockfish testing) started generating the first tables in May, expertly managing two machines, one of them with 384 threads (8x Intel Xeon Platinum 8168) and more than 1 TB of RAM (later distributed differently).Д®ffectively using a huge number of threads is difficult. This can be a bit unintuitive, but it allows perfect play (with regard to outcome) even under the 50-move rule. Syzygy tablebases do not aim for the fastest way to mate, but rather for the fastest way to make a winning capture or pawn move or give mate. Tablebases are also used in applicable lessons and when practising against the computer.Д¬an you finish this endgame as precisely as the World Champion? What is DTZ?ДTZ means distance to zeroing of the counter for the 50-move drawing rule. It will show objective evaluations for every move in the position, giving you the best lines. During analysis, click the book icon on the right side of the board to open it. In endgame positions the opening explorer is replaced by a tablebase explorer.

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Congratulations to Bojun Guo (aka noobpwnftw) and Ronald de Man (aka syzygy) for completing the first free 7-piece tablebase and generously sharing it with the world! Lichess now provides online access on the analysis board and in studies, practice against tablebases, a public API and a mirror for downloading the full tablebase files.

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