What is a Tablebase draw?

An endgame tablebase is a computerized database that contains precalculated exhaustive analysis of chess endgame positions. The tablebase contains the game-theoretical value (win, loss, or draw) in each possible position, and how many moves it would take to achieve that result with perfect play.

What is Syzygy 50 move rule?

A DTZ value n > 100 means the position is winning, but drawn under the 50-move rule. A zeroing move or checkmate can be forced in n or n + 1 half-moves, or in n – 100 or n + 1 – 100 half-moves if a later phase is responsible for the draw.

How does a chess engine work?

In a general way chess engines use a decision tree. The root of the tree is the current position and has a child node for each position that can be made by making a legal move. Each of these nodes in turn have a child node for the positions that can be reached by making a legal move from them.

What is DTZ in tablebase?

The tablebase says DTZ (Distance to Zero) 75, which means it takes 75 half-moves (by perfect play) to reset the 50-move rule counter! A DTM (Distance to Mate) tablebase shows the fastest mate instead, which isn’t always optimal.

What is a tablebase in chess?

Tablebases are a database of precalculated endgame positions. With it, you can quickly find out if any position containing seven pieces or less is theoretically winning, losing, or drawn with perfect play from both sides. Our tool will instantly give you the game’s outcome and show you how you can achieve it.

How many positions stockfish evaluate?

We collect around 3,000,000 different chess positions played by highly skilled chess players and label them with the evaluation function of Stockfish, one of the strongest existing chess engines.

How many moves ahead do chess engines think?

It depends – if the position is relatively static, players tend to spend more time forming abstract plans than calculating concrete variations, while in a tactical game (such as a sacrificial attack) with many forced moves, they can think up to 10-15 moves ahead.

How is a chess tablebase calculated?

Typically the database records each possible position with certain pieces remaining on the board, and the best moves with White to move and with Black to move. Tablebases are generated by retrograde analysis, working backward from a checkmated position. By 2005, all chess positions with up to six pieces (including the two kings) had been solved.

Why are endgame tablebases important in chess?

They provide a powerful analytical tool. While endgame tablebases for other board games like checkers, chess variants or nine men’s morris exist, when a game is not specified, it is assumed to be chess. This article uses algebraic notation to describe chess moves.

How do you write a move in chess?

To write a move, give the name of the piece and the square to which it moves. If a piece is captured, we include the symbol x for “captures” before the destination square. For example, in this game, white’s first move is Nc3: knight to square c3. Black responds with f5 (remember, the P is omitted).

Can you use ChessBase without internet?

Endgame Turbo 5: 6-piece tablebase on a USB stick The latest 7-piece tablebases are still too large to use at this point within ChessBase with a local engine, however you can have access to 6-piece tablebases wherever you are, even without and internet connection thanks to Endgame Turbo 5.