7 pieces tablebases


7 pieces tablebases

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Thibault de Vassal    (2016-04-16)
7 pieces tablebases

Hi all, I just realized that 7-pieces tablebases (Lomonosov tablebases) have been produced... 100 Tb would be necessary to use it!! Looks like that it is available on another chess website, but not for free yet.

It would be useful in the last game of the 13th round robin final :)


Herbert Kruse    (2016-04-17 02:47:32)
7 pieces tablebases

the lomonosov android app says draw

Thibault de Vassal    (2017-11-15 17:10:55)
7 pieces tablebases

Wow, fascinating informations from 7 pieces tablebases in here:


More than 540 moves are necessary to checkmate in some situations!

It would only take 1 To for 7p Syzygy Endgame Tablebases while Lomonosov takes 140 To

Thibault de Vassal    (2017-11-15 18:02:00)
7 pieces tablebases

By the way, do I read/understand correctly that Queen+Rook+Bishop can win against Queen+Queen in any endgame ??

How's that possible?!

Ilmars Cirulis    (2017-11-20 17:44:49)
7 pieces tablebases

Probably the QRB wins against QQ too often to not mention the rare wins (that are shorter too, probably) in the other direction is missing from Wikipedia article.

One has to find complete statistics somewhere as Wikipedia article doesn't help in this case.

Ilmars Cirulis    (2017-11-20 17:48:28)
7 pieces tablebases

I messed up the grammar, but it should be understandable with some effort.

Ilmars Cirulis    (2017-11-21 08:29:46)
7 pieces tablebases

[kqrb4/8/8/8/8/8/8/KQQ5 w - - 0 1] - for example, this is won for the white. :D

Christoph Schroeder    (2018-08-14 18:17:02)
7 pieces tablebases

Some years ago, ICCF has introduced a very useful rule: as soos as a 7 men position is reached, players have the right to claim a win resp. a draw according to what the tablebase says.

Can this be implemented here, too?

Thibault de Vassal    (2018-08-14 19:59:12)
7 pieces tablebases

I always thought that this rule was a bit unfair for players who actually just want to play the game, particularly when not using any engine and/or when rated below 2200... but maybe we could add this rule only when both players are rated over 2200 (or 2000). Any idea?

Christoph Schroeder    (2018-08-16 03:25:38)
7 pieces tablebases

If the rule is introduced, the no-engine-tournaments obviously should be excluded. For all other tournaments (where engines, databases and tablebases are allowed) I see no reason for any exceptions.

Rotom Monotua    (2018-08-16 14:36:55)
7 pieces tablebases

Just a question. Are the tablebases considering the 50 moves rule?
Should a game which is according to the tablebases won (e.g. win in 120 moves" still won if the 50 move rule would settle a draw?

Christoph Schroeder    (2018-08-17 17:37:38)
7 pieces tablebases

According to the ICCF rules, a game is won if the tablebase gives it as a win - no matter how many moves to mate are necessary.

The 50 moves rule was designed to stop playing on forever without making any winning tries. It is a logical development to set it out of order in these cases where a forced win can be proven.

Christoph Schroeder    (2018-08-18 01:03:49)
7 pieces tablebases

Regarding the argument that this rule might be unfair for players who don't want to use engines/databases, I would like answer with a comparison:

If I participate in a bicycle race - but as a runner (without a bicycle), this is strange enough, but maybe allowed. Much more strange, however, is the idea that the organizer of the bicycle race could be urged to adjust the bicycle race rules for the needs of the runners.

Thibault de Vassal    (2018-08-18 01:35:55)
7 pieces tablebases

I understand the comparison (quite funny by the way), but all players do not particularly race in all tournaments - maybe this would make more sense in WCH cycle than in regular tournaments.

@Rotom: Good question... maybe tablebases do not consider it while a software using tablebases could consider it. I don't know as I don't use it for a while.