Answers.Body: <p>On ETD's encouragement, an addendum to his excellent answer.</p>
  
  <p><a href="http://kirill-kryukov.com/chess/discussion-board/viewtopic.php?f=6&amp;t=6941#p76732" rel="nofollow noreferrer">http://kirill-kryukov.com/chess/discussion-board/viewtopic.php?f=6&amp;t=6941#p76732</a> provides a spreadsheet with w/d/l statistics for most common piece combinations from 6-men nalimov tablebases. Screenshot of a part of the spreadsheet below (might have to zoom in..).</p>
  
  <p><strong>EDIT 2018:</strong>
  For up to 7 men, Syzygy tables (also with win percentages) are available: <a href="https://syzygy-tables.info/" rel="nofollow noreferrer">https://syzygy-tables.info/</a></p>
  
  <p><img src="https://i.sstatic.net/MUhlL.png" alt="Screenshot of a part of the spreadsheet"></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2015-06-22T20:19:34.347Z
Answers.LastActivityDate: 2018-09-25T15:08:45.233Z
Answers.LastEditDate: 2018-09-25T15:08:45.233Z
Answers.UserDisplayName: GloriaVictis
Answers.Body: <p>This is end game theory... Usually this comparison is not done in middle game tactics or openings (obviously).</p>
  
  <p>However, my best advice for you is to read about end game books, which completely cover scenarios of rook &amp;bishop vs 2 Knights and MANY MANY other scenarios.</p>
  
  <p>If you want a suggestion, read <strong><em>Domination in 2,545 end game studies</em></strong>. You won't be disappointed and you will find what you want, that I assure you.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-03-05T21:21:41.370Z
Answers.LastActivityDate: 2015-03-05T21:21:41.370Z
Answers.UserDisplayName: Chessbrain
Answers.Body: <p>I don't know a single source tabulating the winning percentages for all 6-piece endings, but at least some amount of summarizing information can probably be found scattered throughout Nunn's <em>Secrets of ... Endings</em> series of books, which are essentially translations from tablebase to human-usable information. But there is a spreadsheet <a href="http://chess.jaet.org/endings/docs/" rel="nofollow">available from Tamplin's chess endgame site</a>, <em>3-5 Man Results and Maximals</em>, that contains the percentage winning statistics across all &lt; 6-man endgames. A sample of the data:</p>
  
  <pre><code>Endgame     wtm(=)  btm(=)      wtm(1-0)    btm(1-0)        wtm(0-1)    btm(0-1)
  
  KK          100.00  100.00      0.00        0.00            0.00        0.00
  KBK         100.00  100.00      0.00        0.00            0.00        0.00
  KNK         100.00  100.00      0.00        0.00            0.00        0.00
  KPK         23.49   41.91       76.51       58.09           0.00        0.00
  KQK         0.00    10.32       100.00      89.68           0.00        0.00
  KRK         0.00    9.97        100.00      90.03           0.00        0.00
  
  ...
  
  KRNKP       1.53    17.10       98.45       78.39           0.01        4.51
  KRNKQ       41.12   19.71       35.44       2.10            23.43       78.19
  KRNKR       63.29   93.60       36.63       3.24            0.07        3.16
  
  ...
  </code></pre>
  
  <p>The first, third and fifth numerical columns give the percentage of white-to-move positions that are, respecitively, draws, white wins or black wins. And the other columns give similar information for the black-to-move positions. I'd think it unlikely that a similar table for 6-man positions doesn't already exist out there in the ether somewhere, but I don't know where such is located.</p>
  
  <hr>
  
  <p><strong>EDIT:</strong> Sure enough, the second edition of Nunn's <em>Secrets of Pawnless Endings</em> (and <strong>not</strong> the first edition which predated available 6-man tablebases) does go at least partly toward what you're after. There is a summary table (pp. 325-329) that, while not providing the numerical detail of the table above, does include for each 6-man piece combination at least an indication of whether it is generally won or drawn (presumably based on whether a majority of positions are theoretically won or not, as above), along with information about the longest win and longest reciprocal zugzwang for each ending.</p>
  
  <p>To use your example, Nunn notes that KRBKNN is generally a win for White, while the longest win is 223 moves from the following position:</p>
  
  <pre><code>[fen "1K6/5BR1/2n5/2n2k2/8/8/8/8 w - - 0 1"]
  </code></pre>
  
  <p>Some of the endings also get discussed in the text. For instance, Nunn gives an optimal line from the above position and attempts to give annotations that make the very complex play involved understandable. (Partial spoiler: <code>1.Kc8!</code> is the only winning move at the start.)</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-03-05T23:42:19.370Z
Answers.LastActivityDate: 2015-03-06T00:02:45.093Z
Answers.LastEditDate: 2015-03-06T00:02:45.093Z
Answers.UserDisplayName: ETD
Body: <p>Is there a site or document which shows what the winning chances are of every "Specific Pieces vs. Specific Pieces" endgame?</p>
  
  <p>e.g. What are the winning chances of Rook &amp; Bishop vs 2 Knights?</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-03-05T16:59:27.343Z
Comments.Text: What do you mean by "winning chances"?
Comments.UserDisplayName: JiK
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-03-05T17:03:44.773Z
Comments.Text: Try http://www.shredderchess.com/online-chess/online-databases/endgame-database.html
Comments.UserDisplayName: Tony Ennis
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-03-05T17:46:32.333Z
Comments.Text: do you mean theoretical result, or chances in that a position can be a draw but white has good chances of winngin.
Comments.UserDisplayName: CognisMantis
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-03-05T17:50:44.630Z
Comments.Text: If we knew why you wanted to know this, we could give you better answers.
Comments.UserDisplayName: Tony Ennis
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-03-06T14:11:08.733Z
Comments.Text: @JiK like, Queen and king vs lone king is somewhat like 99% winning, 
  
  a position like this would end in a draw:
  
  6K1/8/8/8/8/8/8/kQ6 b - - 0 1
Comments.UserDisplayName: user5649
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-09-25T19:53:41.187Z
Comments.Text: Note that the possible positions in a 6-man ending are not equally likely to appear in a real-life chess match, so it is somewhat dubious from a statistical point of view to compute a winning percentage by considering them all equiprobable.
Comments.UserDisplayName: Federico Poloni
Tags: <endgame><statistics><tablebases>
Title: What are the winning chances of every pieces? (6men egtb)
ThreadText: # What are the winning chances of every pieces? (6men egtb)
  
  (Asked by: username_0 on 2015-03-05)
  
  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?
  
  **Tags:** endgame, statistics, tablebases
  
  > **Comments:**
  > **username_1**: What do you mean by "winning chances"?  
  > **username_2**: Try http://www.shredderchess.com/online-chess/online-databases/endgame-database.html  
  > **username_3**: do you mean theoretical result, or chances in that a position can be a draw but white has good chances of winngin.  
  > **username_2**: If we knew why you wanted to know this, we could give you better answers.  
  > **username_0**: @username_1 like, Queen and king vs lone king is somewhat like 99% winning,   a position like this would end in a draw:  6K1/8/8/8/8/8/8/kQ6 b - - 0 1  
  > **username_4**: Note that the possible positions in a 6-man ending are not equally likely to appear in a real-life chess match, so it is somewhat dubious from a statistical point of view to compute a winning percentage by considering them all equiprobable.  
  
  ---
  
  ## 3 answers
  
  ### Answer by username_7 on 2015-03-05. Score: 4 | Accepted answer
  
  I don't know a single source tabulating the winning percentages for all 6-piece endings, but at least some amount of summarizing information can probably be found scattered throughout Nunn's Secrets of ... Endings series of books, which are essentially translations from tablebase to human-usable information. But there is a spreadsheet available from Tamplin's chess endgame site, 3-5 Man Results and Maximals, that contains the percentage winning statistics across all < 6-man endgames. A sample of the data:
  Endgame     wtm(=)  btm(=)      wtm(1-0)    btm(1-0)        wtm(0-1)    btm(0-1)
  
  KK          100.00  100.00      0.00        0.00            0.00        0.00
  KBK         100.00  100.00      0.00        0.00            0.00        0.00
  KNK         100.00  100.00      0.00        0.00            0.00        0.00
  KPK         23.49   41.91       76.51       58.09           0.00        0.00
  KQK         0.00    10.32       100.00      89.68           0.00        0.00
  KRK         0.00    9.97        100.00      90.03           0.00        0.00
  
  ...
  
  KRNKP       1.53    17.10       98.45       78.39           0.01        4.51
  KRNKQ       41.12   19.71       35.44       2.10            23.43       78.19
  KRNKR       63.29   93.60       36.63       3.24            0.07        3.16
  
  ...
  
  The first, third and fifth numerical columns give the percentage of white-to-move positions that are, respecitively, draws, white wins or black wins. And the other columns give similar information for the black-to-move positions. I'd think it unlikely that a similar table for 6-man positions doesn't already exist out there in the ether somewhere, but I don't know where such is located.
  
  EDIT: Sure enough, the second edition of Nunn's Secrets of Pawnless Endings (and not the first edition which predated available 6-man tablebases) does go at least partly toward what you're after. There is a summary table (pp. 325-329) that, while not providing the numerical detail of the table above, does include for each 6-man piece combination at least an indication of whether it is generally won or drawn (presumably based on whether a majority of positions are theoretically won or not, as above), along with information about the longest win and longest reciprocal zugzwang for each ending.
  To use your example, Nunn notes that KRBKNN is generally a win for White, while the longest win is 223 moves from the following position:
  [fen "1K6/5BR1/2n5/2n2k2/8/8/8/8 w - - 0 1"]
  
  Some of the endings also get discussed in the text. For instance, Nunn gives an optimal line from the above position and attempts to give annotations that make the very complex play involved understandable. (Partial spoiler: 1.Kc8! is the only winning move at the start.)
  
  
  ---
  
  ### Answer by username_5 on 2015-06-22. Score: 3
  
  On username_7's encouragement, an addendum to his excellent answer.
  
  <http://kirill-kryukov.com/chess/discussion-board/viewtopic.php?f=6&t=6941#p76732> provides a spreadsheet with w/d/l statistics for most common piece combinations from 6-men nalimov tablebases. Screenshot of a part of the spreadsheet below (might have to zoom in..).
  
  **EDIT 2018:**
  For up to 7 men, Syzygy tables (also with win percentages) are available: <https://syzygy-tables.info/>
  
  ![Screenshot of a part of the spreadsheet](https://i.sstatic.net/MUhlL.png)
  
  
  ---
  
  ### Answer by username_6 on 2015-03-05. Score: -1
  
  This is end game theory... Usually this comparison is not done in middle game tactics or openings (obviously).
  
  However, my best advice for you is to read about end game books, which completely cover scenarios of rook &bishop vs 2 Knights and MANY MANY other scenarios.
  
  If you want a suggestion, read ***Domination in 2,545 end game studies***. You won't be disappointed and you will find what you want, that I assure you.
  
  
  ---
  
  