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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164 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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0answers
37 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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0answers
18 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) ?
4
votes
1answer
147 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-men-tablebases. Unfortunately, even the pwanless 7-men-tablebases are not available online. So, ...
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0answers
37 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
82 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
46 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 ...
1
vote
2answers
64 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 ...
0
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0answers
116 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 ...
0
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0answers
43 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 ...
0
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0answers
138 views

Can someone check the following claim?

Can someone check this claim I found out using SCID and a tablebase : Consider the endgame queen+pawn vs queen (KQPKQ) Suppose, the white pieces have the following positions King on g7 Queen on ...
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vote
2answers
90 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?
1
vote
1answer
73 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 ...
0
votes
1answer
93 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 ...
4
votes
2answers
194 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 ...
1
vote
1answer
152 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 ...
1
vote
1answer
104 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 ...
2
votes
1answer
59 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
2
votes
1answer
78 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
votes
1answer
140 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).
4
votes
3answers
870 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 ...
10
votes
2answers
3k 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 ...
3
votes
2answers
186 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 ...
8
votes
2answers
628 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 ...
13
votes
4answers
5k views

Can a rook win against a knight in the endgame?

Suppose we have just rook and our opponent has just one knight which is near to his king is it possible to win this game theoretically? For example, in the following position (white to move), is it ...
20
votes
3answers
3k views

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 ...