Answers.Body: <p><a href="http://chessok.com/?page_id=27966">http://chessok.com/?page_id=27966</a></p>
  
  <p>History Note</p>
  
  <p>The first ending tablebases - for all 4-piece endgames - were built by the end of the 80-s. In the beginning of the 90-s, the same task was done for 5-pieces. In 2005, 6-piece endings were solved in Nalimov Tablebases which are now used by many professional chess programs and services.</p>
  
  <p>Experts didn’t expect 7-piece endings to be cracked and catalogued until after 2015, but Convekta Ltd, namely programmers Zakharov and Makhnichev - the developers of the Aquarium interface - managed to solve this task in just 6 months using a new algorithm designed specifically for this purpose and run on the Lomonosov supercomputer based in the Moscow State University.
  Lomonosov Tablebases</p>
  
  <p>As a result, we now have 525 tablebases of the 4 vs. 3 type and 350 tablebases of the 5 vs. 2 type. The calculations for 6 pieces playing against a lone king weren’t done because the outcome is rather obvious.</p>
  
  <p>The total volume of all tablebases is 140 000 gigabytes, which is obviously too much for personal computers. Lomonosov Tablebases will be accessible online from the Aquarium interface and on the chessok.com website. All users of ChessOK Aquarium, Houdini Aquarium and Chess Assistant products get free access to the service for the period specified in their product description.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2014-09-29T02:52:46.523Z
Answers.LastActivityDate: 2014-09-29T02:52:46.523Z
Answers.UserDisplayName: the_king
Answers.Body: <p>The 7 piece EGTB is not yet freely available online, as far as I know. Building the tablebase is costly in time and resources and the storage space is not cost-free either.
  <br>
  <br>Concerning <a href="http://tb7.chessok.com/">http://tb7.chessok.com/</a> do not be too disappointed, because they mention this explicitly (at least today, maybe not on April 11th when you tried):
  <br> "<em>Currently the tablebases are only accessible by legal owners of Chess Asssitant 14, ChessOk Aquarium 2014 or Houdini 4 Aquarium. Later, more users will be able to use the service.</em>"
  <br>
  <br>And on <a href="http://tb7.chessok.com/signup">their signup page</a>: 
  <br>" <em>After registration you will be able to:
  <br>probe 6-man ending tablebases; 
  <br>(...)
  <br>probe 7-man tablebases (license key required – see the next page).</em>"</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2014-04-19T15:26:55.247Z
Answers.LastActivityDate: 2014-04-19T15:26:55.247Z
Answers.UserDisplayName: Eric
Answers.Body: <p><a href="https://syzygy-tables.info/" rel="nofollow noreferrer">https://syzygy-tables.info/</a> allows to look up 7-men endgame positions. It does not give DTM information for 6- and 7-men endgames, only DTZ50+. On one hand, it is compliant with 50-move rule, OTOH, DTZ50-optimal play can be ugly (if it is possible to push a pawn or sacrifice a piece, it will).</p>
  
  <p>Also available for download: <a href="https://tablebase.lichess.ovh/tables/standard/" rel="nofollow noreferrer">https://tablebase.lichess.ovh/tables/standard/</a></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-07-18T13:11:06.033Z
Answers.LastActivityDate: 2018-08-19T17:53:55.210Z
Answers.LastEditDate: 2018-08-19T17:53:55.210Z
Answers.UserDisplayName: user16979
Answers.Body: <h3>Original Answer:</h3>
  
  <p>7-men Lomonosov is <a href="https://play.google.com/store/apps/details?id=com.convekta.android.lomonosovtb" rel="noreferrer">free as an Android application</a>.</p>
  
  <hr>
  
  <h3>Update - September 2018:</h3>
  
  <p>7-men Syzygy is <a href="https://syzygy-tables.info/" rel="noreferrer">available for free</a>. Also <a href="https://lichess.org/blog/W3WeMyQAACQAdfAL/7-piece-syzygy-tablebases-are-complete" rel="noreferrer">available from Lichess</a>.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2016-01-30T03:49:40.050Z
Answers.Text: Yes, you don't need a license key to probe 7 piece positions with the app!
Answers.UserDisplayName: Brent Baccala
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-02-06T15:56:04.363Z
Answers.Text: The comments on the Google Play store seem to indicate that the app no longer works. I can't verify that since I don't yet have an Android device.
Answers.UserDisplayName: rajb245
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2015-12-29T01:03:45.537Z
Answers.LastActivityDate: 2018-09-15T11:25:20.700Z
Answers.LastEditDate: 2018-09-15T11:25:20.700Z
Answers.UserDisplayName: ferit
Body: <p>The only 7 piece site I heard about is <a href="http://tb7.chessok.com/" rel="noreferrer">http://tb7.chessok.com/</a> , 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 an error about service not being avaiable. Has anyone had better luck or know of any other site with 7 pieces tablebases?</p>
  
  <p>Update: in the end I discovered that FinalGen solved a vast majority of positions I was interested in, included those with more than 7 pieces. <a href="http://finalgenchess.ovh/home_ing.php" rel="noreferrer">http://finalgenchess.ovh/home_ing.php</a></p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-04-12T18:40:11.440Z
Comments.Text: possible duplicate of [What is the status for seven man end game table bases?](http://chess.stackexchange.com/questions/351/what-is-the-status-for-seven-man-end-game-table-bases)
Comments.UserDisplayName: RemcoGerlich
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-04-13T04:41:38.480Z
Comments.Text: I had looked for a dup, but somehow missed that question... My emphasis is on FREE though. Is it correct to assume that chessok site only provides free access to 6 pieces and less, while 7 pieces require a license key?
Comments.UserDisplayName: Joe
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-04-13T11:50:24.430Z
Comments.Text: As far as I know, yes. I think they're the only ones who've made 7 piece tablebases, and as they take 140TB storage space, I think they'd like to have some return on their investment.
Comments.UserDisplayName: RemcoGerlich
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-04-13T19:37:39.577Z
Comments.Text: @RemcoGerlich fair enough; but if that's the case I wish it was made clear on their website what part is free, and what part is not; the error message that shows up when I add the 7th piece seems rather cryptic.
Comments.UserDisplayName: Joe
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-12-29T01:15:38.197Z
Comments.Text: @Joe I have an answer suggesting a free access to 7-men Lomonosov.
Comments.UserDisplayName: ferit
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-02-26T09:05:06.657Z
Comments.Text: mtu-media.com does not exist
Comments.UserDisplayName: M.M
Tags: <software><endgame><tablebases>
Title: Is there a freely available online 7 piece Endgame tablebase?
ThreadText: # Is there a freely available online 7 piece Endgame tablebase?
  
  (Asked by: username_0 on 2014-04-11)
  
  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 an error about service not being avaiable. Has anyone had better luck or know of any other site with 7 pieces tablebases?
  
  Update: in the end I discovered that FinalGen solved a vast majority of positions I was interested in, included those with more than 7 pieces. <http://finalgenchess.ovh/home_ing.php>
  
  **Tags:** software, endgame, tablebases
  
  > **Comments:**
  > **username_1**: possible duplicate of [What is the status for seven man end game table bases?](http://chess.stackexchange.com/questions/351/what-is-the-status-for-seven-man-end-game-table-bases)  
  > **username_0**: I had looked for a dup, but somehow missed that question... My emphasis is on FREE though. Is it correct to assume that chessok site only provides free access to 6 pieces and less, while 7 pieces require a license key?  
  > **username_1**: As far as I know, yes. I think they're the only ones who've made 7 piece tablebases, and as they take 140TB storage space, I think they'd like to have some return on their investment.  
  > **username_0**: @username_1 fair enough; but if that's the case I wish it was made clear on their website what part is free, and what part is not; the error message that shows up when I add the 7th piece seems rather cryptic.  
  > **username_2**: @username_0 I have an answer suggesting a free access to 7-men Lomonosov.  
  > **username_3**: mtu-media.com does not exist  
  
  ---
  
  ## 4 answers
  
  ### Answer by username_2 on 2015-12-29. Score: 17 | Accepted answer
  
  ### Original Answer:
  
  7-men Lomonosov is [free as an Android application](https://play.google.com/store/apps/details?id=com.convekta.android.lomonosovtb).
  
  ---
  
  ### Update - September 2018:
  
  7-men Syzygy is [available for free](https://syzygy-tables.info/). Also [available from Lichess](https://lichess.org/blog/W3WeMyQAACQAdfAL/7-piece-syzygy-tablebases-are-complete).
  
  > **Comments:**
  > **username_7**: Yes, you don't need a license key to probe 7 piece positions with the app!  
  > **username_8**: The comments on the Google Play store seem to indicate that the app no longer works. I can't verify that since I don't yet have an Android device.  
  
  ---
  
  ### Answer by username_4 on 2014-09-29. Score: 7
  
  <http://chessok.com/?page_id=27966>
  
  History Note
  
  The first ending tablebases - for all 4-piece endgames - were built by the end of the 80-s. In the beginning of the 90-s, the same task was done for 5-pieces. In 2005, 6-piece endings were solved in Nalimov Tablebases which are now used by many professional chess programs and services.
  
  Experts didn’t expect 7-piece endings to be cracked and catalogued until after 2015, but Convekta Ltd, namely programmers Zakharov and Makhnichev - the developers of the Aquarium interface - managed to solve this task in just 6 months using a new algorithm designed specifically for this purpose and run on the Lomonosov supercomputer based in the Moscow State University.
  Lomonosov Tablebases
  
  As a result, we now have 525 tablebases of the 4 vs. 3 type and 350 tablebases of the 5 vs. 2 type. The calculations for 6 pieces playing against a lone king weren’t done because the outcome is rather obvious.
  
  The total volume of all tablebases is 140 000 gigabytes, which is obviously too much for personal computers. Lomonosov Tablebases will be accessible online from the Aquarium interface and on the chessok.com website. All users of ChessOK Aquarium, Houdini Aquarium and Chess Assistant products get free access to the service for the period specified in their product description.
  
  
  ---
  
  ### Answer by username_5 on 2014-04-19. Score: 5
  
  The 7 piece EGTB is not yet freely available online, as far as I know. Building the tablebase is costly in time and resources and the storage space is not cost-free either.
    
    
  Concerning <http://tb7.chessok.com/> do not be too disappointed, because they mention this explicitly (at least today, maybe not on April 11th when you tried):
    
   "*Currently the tablebases are only accessible by legal owners of Chess Asssitant 14, ChessOk Aquarium 2014 or Houdini 4 Aquarium. Later, more users will be able to use the service.*"
    
    
  And on [their signup page](http://tb7.chessok.com/signup):
    
  " *After registration you will be able to:
    
  probe 6-man ending tablebases;
    
  (...)
    
  probe 7-man tablebases (license key required – see the next page).*"
  
  
  ---
  
  ### Answer by username_6 on 2018-07-18. Score: 4
  
  <https://syzygy-tables.info/> allows to look up 7-men endgame positions. It does not give DTM information for 6- and 7-men endgames, only DTZ50+. On one hand, it is compliant with 50-move rule, OTOH, DTZ50-optimal play can be ugly (if it is possible to push a pawn or sacrifice a piece, it will).
  
  Also available for download: <https://tablebase.lichess.ovh/tables/standard/>
  
  
  ---
  
  