Questions tagged [tablebases]

Tablebases are databases that contain complete, exhaustively calculated moves and variations for a given collection of chess positions. E.g. the Nalimov tablebases contain full solutions for all endgames involving 6 pieces or less.

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4 answers
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What is the status for seven man end game table bases?

There are complete (or nearly complete) six man end game table bases available for download, and even online. What is the status of seven man table bases? Is there still active development in this ...
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30 votes
5 answers
36k views

Can a rook win against a knight in the endgame?

Suppose we have a rook and the opponent has a knight next to his king. Is it possible to win this game theoretically? E.g., in the following position (white to move), is it possible for white to ...
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8 votes
3 answers
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How far from solving chess are we?

See here: Does there exist an algorithm that would play perfect chess if given infinite processing power? With infinite power, we could trivially recursively check every board state for winnability, ...
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5 votes
3 answers
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What are the winning chances of every pieces? (6men egtb)

Is there a site or document which shows what the winning chances are of every "Specific Pieces vs. Specific Pieces" endgame? e.g. What are the winning chances of Rook & Bishop vs 2 Knights?
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25 votes
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Is there a freely available online 7 piece Endgame tablebase?

The only 7 piece site I heard about is http://tb7.chessok.com/ , and upon registration I am able to setup various positions with 2-6 pieces . However as soon as I setup a position with 7 piece, I get ...
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21 votes
3 answers
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Will quantum computers solve chess?

The theory is that there are more that 10^40 positions, and a computer that works with an atomic scale has to be impossibly large(As in galaxy-scale large), and well beyond our current level of ...
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14 votes
1 answer
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What is Syzygy tablebases?

I just want to know in simple language exactly, What the Syzygy tablebases are, Why they are used, What are their advantages, disadvantages?
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12 votes
5 answers
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How many legal but unreachable positions exist?

Consider this legal chess position which can never be reached from the normal starting position. [FEN "6kb/6p1/6K1/8/8/8/8/8 w - - 0 1"] The Black bishop is placed on h8, but with the Black ...
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6 votes
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Endgame Tablebases-What are they?

I've been reading and enjoying the site immensely. What is the "Endgame Tablebase"? I see it referenced frequently.
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4 votes
1 answer
700 views

What is the longest tablebase win that includes draw rules?

It has been asked the longest mate that includes draw rules is, and it is known what the longest tablebase mate is. However, what is the longest tablebase mate, i.e. 7 pieces or less, that accounts ...
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4 votes
1 answer
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How long would it take China's Tianhe-2 Supercomputer to produce an 8-man tablebase?

Wondering how long it would take a TOP10 Supercomputer to fully construct an 8-man tablebase.
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3 votes
1 answer
481 views

Longest DTM in the endgame KQPPKQ

What is the longest DTM in the endgame queen and two pawns versus a queen (KQPPKQ? This position is a mate in 167 moves. [FEN "8/k7/6K1/1Q6/8/P6q/7P/8 w - - 0 1"] Are the DTC and/or DTZ ...
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2 votes
1 answer
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What is the longest known 7-piece checkmate?

What is the longest known 7-piece checkmate?
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