That is why the new Syzygy Bases are such an important step up. They represented an important evolution over the previous standard Edwards tablebases, since the five-piece set took up a mere 7.1 GB, which was about eight times smaller than the predecessor. The first five-man set came out in late 1998, and the six-man set was completed by 2005. There is an immediate and absolute result.įor over a decade now, the reference tablebase format has been the Nalimov set, created by Eugene Nalimov. A complete five-piece tablebase set means that everytime the position is reduced to five pieces (these always include kings), such as king+rook against king+rook+pawn, there are no calculations to be made. They represent the absolute indisputable truth of a position, that cannot be ignored. Tablebases have been a boon to chess players and researchers.
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W/L/D/"win but break 50-move rule", but in any practical game, you are pretty much guaranteed that you will never see this difference. However, some positions may contain a sequence of moves to mate that require breaking the 50-move rule the evaluations of these positions in the tablebases may be changed to accommodate for this, e.g. (The possible difference in content, if any, is subtle: first off, every legal position in the tablebase has an evaluation attached to it (draw/win/loss in X moves).
Their only difference is the memory space they occupy. For all practical purposes, there is absolutely no difference between the content of Syzygy and Nalimov tablebases a computer that uses either one will play at the same strength (perfect!). Syzygy and Nalimov, refer to nothing more than compression methods. The different names in front of 'tablebases', e.g.
The Nalimov 6-man tablebases take up over 1TB of memory space, whereas the Syzygy bases use less than 200GB. Syzygy tablebases are relatively new (introduced about 2 years ago), compared to the Nalimov tablebases which have been around for quite a while (itself being a compression improvement over previous tablebases). Owing to the memory issue, compression techniques help to reduce the space taken up by the tablebases. The disadvantage is that they take up a large amount of memory space. So as an advantage, they save computational time and allow your machine to play certain endgame positions perfectly. Tablebases are perfect, in the sense that it can tell you number of moves to mate, and playing a position against a program using tablebases (in positions with very few pieces left) is akin to "playing with god". This allows a chess program, in such positions, to look straight into the tablebase, rather than to calculate via the engine. they also contain the moves to get from one legal position to another (in particular, moves that eventually lead to mate). These databases have the positions 'connected', i.e. Tablebases are databases of endgame positions, with few pieces left on the board (say a 5-man tablebase, which consists of all legal positions with 5 pieces on the board in total, including kings, say K+Q vs.
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