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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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175 views

How does syzygy store its information?

From reading everything I've found so far, I know that syzygy uses both win/draw/loss files and distance to zero files, but I haven't found any information on the internal file format that these files ...
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2answers
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Where can I download and how do I set up a 5-man tablebase in Arena GUI?

So, I want to download a 5-man tablebase (I have no disk space for a 6-man one) and set it up so that it works with Stockfish in Arena GUI. Where can I download the tablebase, and how do I install it ...
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1answer
114 views

Is it possible to get DTM of a position from sygyzy tables?

This is a programming question related to chess endgame tables. As far as I know syzygy tables allow me to get WDL and DTZ information for a given position. Is it possible to somehow (without access ...
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1answer
356 views

Where can I download gaviota endgame tables?

I am looking for a link to download all 5 pieces gaviota endgame tables (which can give me DTM values). A few links from google search (like this) lead me to the site which does not exist.
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268 views

Syzygy 6 man Tablebase Files Question

Is anyone familiar with the .wdl and .dtz formats for the 6 man tablebase that are available? I already confirmed that both aren't needed, however they both store different information. Goal is to ...
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2answers
648 views

Where to download a 6 man Nalimov endgame tablebase?

Can anyone tell me whereabouts I can download a 6 man Nalimov endgame tablebase? I've seen some websites with 6 man Nalimov (case in point: http://contentdb.emule-project.net/view.php?pid=1630). ...
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125 views

Complexity of critical positions

I understand that chess is pretty complex regarding the game tree complexity (Shannon number) or number of possible positions. If we were trying to solve chess (whuch I know is impossible for ...
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3answers
764 views

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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1answer
1k views

Do Stockfish and the tablebase work together or independently?

I use Arena GUI together with stockfish in engine games. I want to download a 6-piece tablebase but that is just a lot of work (and perhaps unnecessary). If I download the tablebase (syzygy), does ...
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2answers
310 views

Does the Lomonosov Tablebase (and others) include extra material positions such as KQQvKQQQ?

Lomonosov Endgame Tablebase says it includes all endgames with 7 pieces. But does that include things like KQQ v KQQQ? At every possible position? Such things seem highly unlikely, but theoretically ...
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0answers
133 views

how to use ending evaluation in UCI interaction with Stockfish

Playing with the Stockfish 8 UCI from the terminal, I've managed to make it compute move, set the position and load SYZYGY tables. But how can know if an endgame, that corresponds to a kind of ...
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3answers
192 views

Public higher-order endgame tablebases for *common* positions?

It's easy for me to locate 6-piece tablebases online for free (e.g. lichess), and I know 7-piece tablebases exist (cf. Lomonosov tablebase), but I don't know of any easy way to access them. However, ...
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2answers
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6 man syzygy tablebase and ramdisk

I have downloaded a copy of the 6 man Syzygy tablebase and configured it on my Fritz 15 GUI. Due to obvious memory constraints, the full 6 man Syzygy tablebase cannot be loaded into memory (ie. ...
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1answer
119 views

Fathom syzygy browsing tool

I'm trying to make syzygy browsing tool fathom.exe work. If you have experience with this, please let me know. I tried million of combinations of tokens to format the position command and the program ...
4
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1answer
260 views

Generate Simple Mate In 1 From Tablebases (for kids)

I was trying to find a kid's app for chess that has some incredibly simple problems. However, all the apps I found had rather tricky problems. So I thought I would download 3 piece table bases and use ...
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3answers
173 views

Are all KQvK positions winnable if it's not stalemate and Black can't capture on current move?

Are all KQvK positions winnable if the position isn't in itself a stalemate and Black cannot capture on the current move?
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1answer
139 views

Is there any UCI engine that presents DTZ information from syzygy in analyse mode?

Many UCI engines that can read syzygy database put same score for every winning move (#1000 in komodo, +123.53 in stockfish, ...) and you have no idea how to make real progress when analysing root ...
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2answers
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How is it possible that the Lomonosov-endgame-tablebase from 2012 still is the most powerful tablebase?

Due to Wikipedia: Endgame tablebase the Lomonosov endgame tablebase is still the biggest tablebase (with a size of 140TB). Now this tablebase was computed in the year 2012 with the Lomonosov 1 (Top500-...
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3answers
298 views

KRPP vs KRP - maximum depth to conversion?

I am trying to learn single rook endgames with two pawns against one, with added stipulation that the two pawns of the attacking side are on neighboring files with the pawn of the defending side also ...
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1answer
310 views

What is the longest current tablebase mate with a unique optimal line?

What is the longest current tablebase mate with a unique optimal line? (I'm inspired by this post on chessbase.com.)
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2answers
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Are there any other endgame analysis tool than Wilhelm?

Are there any other endgame analysis tool than Wilhelm?
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2answers
192 views

chess endgame database + 50-move rule = potential error?

Are there any examples of positions where usage of the endgame tablebase gives an incorrect evaluation, due to the ignoring of the 50-move rule. At the moment I am not sure if endgame tablebases ...
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1answer
5k views

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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2answers
167 views

What are the dates of end-game table completion for 2 pieces, 3 pieces, all the way to 7 pieces?

I'm curious to get a rough sense for when chess could be solved if Moore's law, and algorithm improvements continue, and I thought a good way to get a rough idea would be to extrapolate based on when ...
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3answers
215 views

Why are tablebase files so large?

What is the reason that table base files are so large? I can't think of any other way to phrase that question - but the question alone is rejected by stackoverflow's gateway bot, hence this paragraph ...
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2answers
809 views

Syzygy tablebases in xboard

I'm trying to set up the five-men syzygy tablebases for use in xboard 4.8. Stockfish 6 and Komodo 9 are both supposed to support Syzygy, but in Xboard, their SyzygyPath option is missing from the UCI ...
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2answers
270 views

What is the maximum DTM with K+J vs K?

What is the maximum DTM in the endgame king + janus vs king on a 10x8-board ? The janus can move like a bishop or like a knight. Since both sides have two additional pieces, the board has 10 columns ...
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1answer
131 views

Have endgame tablebases ever been compiled for smaller variants of chess?

I am interested in compiling endgame tablebases for a few miniature chess variants, such as Chess Attack (5x6) and Los Alamos Chess (6x6). Have these ever been created before, and if so, are they ...
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1answer
168 views

Maximum DTC and maximum DTZ in the endgame KRPKRP

What is the maximum DTC and the maximum DTZ in the endgame KRPKRP (rook+pawn against rook+pawn) ?
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1answer
475 views

Can the bishops and knights triumph over the queen?

I heard that two bishops and two knights have good winning chances against the queen according to the 7-man tablebases. Unfortunately, even the pawnless 7-man tablebases are not available online. So, ...
2
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1answer
118 views

Is there any method to determine if the weaker side in KQPKQ has a perpetual check?

Is there any possibility to check without the use of the tablebases, if some position in the endgame queen + pawn vs queen (KQPKQ) allows a perpetual check for the weaker side ?
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2answers
130 views

Normal draw positions in the endgame KQPKQ with a bishop-pawn?

Suppose, in the endgame queen + pawn vs queen (KQPKQ) , the stronger side has a bishop-pawn (c-pawn or f-pawn). The weaker side cannot win the pawn, nor has a perpetual check, nor can play on ...
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0answers
109 views

Comfortable DTC - endgame database

The only online endgame database supporting DTC I know is http://chess.jaet.org/cgi-bin/mzugs But the positions can only be entered by FEN, it is not possible to drag pieces. Does anyone know a ...
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2answers
92 views

Longest sequence with only moves to draw without a repitition

What is the longest known sequence of moves with upto 6 pieces where each move of both sides is the only move drawing the game (any other move would lose the game) ? There should not occur any ...
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2answers
426 views

Longest way to mate with 1 queen against 4 queens

What is the longest way to checkmate with 1 queen against 4 queens (no other pieces on the board) ? Since there are ways 13 moves long with a queen vs two queens, I conjecture this should be ...
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0answers
160 views

mutual zugzwangs and longest wins (DTM, DTC and DTZ) in the endgame KRPPKRP

Is there any survey on the mutual zugzwang positions and the longest wins (splitted to DTM, DTC and DTZ) in the endgame KRPPKRP (rook + 2 pawns vs rook + 1 pawn) ? Unfotunately, the 7 men tablebases ...
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3answers
601 views

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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1answer
220 views

Longest DTM in the endgame KQPPKQ

What is the longest DTM in the endgame queen and two pawns versus a queen (KQPPKQ) ? The position White : Kg6 , Qb5 , Pa3, h2 Black : Ka7 , Qh3 is mate in 167 if white has the move. Is also the ...
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1answer
305 views

chess program wilhelm

I still search an executable file of the chess program wilhelm. It is not only a chess endgame database, you can fix pieces to be on concrete squares and check all such position to get a statistic ...
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2answers
340 views

Is there a Web Service available for 6-piece endgame tablebases?

I use the LokaSoft web service for 5-piece endgames, but cannot find one for 6 pieces. BTW, by web service I mean a software function capable of being called over the internet (see http://en....
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1answer
286 views

Is there an online database for the endgame KRPPKRP?

It was stated at this forum that the 7-men-endgames are still not available online. What about the special endgame KRPPKRP (Rook and 2 pawns against Rook and 1 pawn) ? It would be nice if the ...
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1answer
162 views

Longest DTC in the endgame KQPKQ depending on the place of the white pawn

I remember some statistics by Guy Haworth from the endgame KQPKQ (queen + pawn vs queen). One of the statistics was the maximum DTC depending on the place of the white pawn (due to symmetry, it can ...
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1answer
177 views

Endgame Tablebase, what is it?

I've been reading and enjoying the site immensely. What is the Endgame Tablebase? I see it referenced frequently. TIA
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1answer
318 views

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.
3
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1answer
550 views

How many positions are there in n-pieces endgame tablebases for different values of n? [duplicate]

Note that I don't want the exact values, I only need approximations. And I am only interested in small values of n (not more than 12).
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2answers
272 views

What is the smallest possible size of Nalimov endtables?

I have recently found the following place, where I can find the outcome for any 6-piece endgame with Nalimov endtables. I was surprised to see this, because I have recently read that set of tables ...
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4answers
5k views

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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4answers
13k views

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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3answers
549 views

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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2answers
1k views

Computer endgame strength without tablebases

I have seen that engines aren't particularly strong in the openings without access to a book. How strong are modern engines in the endgame when they are not allowed access to tablebases? E.g., can ...