Answers.Body: <p>As simple as a Knight or even a pawn, if you consider the fact that your opponent's pieces can block the escape squares too. </p>
  
  <p>Example: </p>
  
  <p>W: Kf1, Nf2</p>
  
  <p>B: Kh1, h2. </p>
  
  <p>The Assume that white played Nf2# in the last move. So, white has just used one knight to checkmate black king. </p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-18T09:23:04.943Z
Answers.Text: The question specifies that the opponent has only the king left.
Answers.UserDisplayName: BlindKungFuMaster
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-16T19:26:01.490Z
Answers.LastActivityDate: 2015-12-16T19:26:01.490Z
Answers.UserDisplayName: Arun J
Answers.Body: <pre><code>There are many answers to your question, 
  
  1) A rook 
  2) Any 2 minor pieces (Minor pieces:  Bishop, Night)
  3) A Queen
  4) 1 pawn :)
  </code></pre>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-16T15:28:42.797Z
Answers.Text: All of those answer should include king. Also you cannot checkmate with only two knights and a king. (your 2nd case fails in that condition).
Answers.UserDisplayName: Saeed Amiri
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-17T00:58:08.417Z
Answers.Text: @SaeedAmiri No, you can checkmate with two knights, it's possible just not forced. Your statement is therefore false.
Answers.UserDisplayName: SmallChess
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-17T10:46:42.547Z
Answers.Text: @StudentT, According to the question : "What are the minimum sets of pieces required", it means we are talking in the context of force mate. Also if you want interpret it like this (somehow funny), I should inform you it's even impossible to checkmate with two knights (as you wrote), they cannot cover required squares. You need at least one another piece to checkmate your opponent (e.g king).
Answers.UserDisplayName: Saeed Amiri
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-17T23:57:13.723Z
Answers.Text: If the 2 minor pieces are bishops, they must be on opposite color squares.
Answers.UserDisplayName: bof
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Answers.CreationDate: 2015-12-16T14:17:03.413Z
Answers.LastActivityDate: 2015-12-16T14:17:03.413Z
Answers.UserDisplayName: Raja
Answers.Body: <ul>
  <li>King + Bishop + Knight</li>
  <li>King + Bishop + Bishop </li>
  <li>King + Rook</li>
  <li>King + Queen</li>
  <li>and don't forget the unlikely King + Knight + Knight + Knight</li>
  </ul>
  
  <p>Assuming the lone King is attempting to avoid checkmate.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-17T10:13:37.950Z
Answers.Text: King + Knight + Knight + Knight?
Answers.UserDisplayName: bof
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-17T23:40:46.290Z
Answers.Text: @bof I doinked around with Nalimov endgame tables and could not find a case where three knights wasn't enough.  Editing.
Answers.UserDisplayName: Tony Ennis
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-17T23:51:09.553Z
Answers.Text: I never studied K+3N vs. K (and never saw it in a game!) bit I dimly recall that it was a win according to Fine's *Basic Chess Endings*.
Answers.UserDisplayName: bof
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-16T12:16:20.940Z
Answers.LastActivityDate: 2015-12-17T23:41:23.860Z
Answers.LastEditDate: 2015-12-17T23:41:23.860Z
Answers.UserDisplayName: Tony Ennis
Body: <p>What are the minimum sets of pieces required for checkmate when the opponent has no other piece that the king?</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-12-16T12:25:57.730Z
Comments.Text: Have a look at this question: http://chess.stackexchange.com/questions/5028/what-is-sufficient-mating-material
Comments.UserDisplayName: Dag Oskar Madsen
Tags: <checkmate><check><pieces><minor-pieces>
Title: Minimum sets of pieces required for checkmate?
ThreadText: # Minimum sets of pieces required for checkmate?
  
  (Asked by: username_0 on 2015-12-16)
  
  What are the minimum sets of pieces required for checkmate when the opponent has no other piece that the king?
  
  **Tags:** checkmate, check, pieces, minor-pieces
  
  > **Comments:**
  > **username_1**: Have a look at this question: http://chess.stackexchange.com/questions/5028/what-is-sufficient-mating-material  
  
  ---
  
  ## 3 answers
  
  ### Answer by username_8 on 2015-12-16. Score: 6 | Accepted answer
  
  * King + Bishop + Knight
  * King + Bishop + Bishop
  * King + Rook
  * King + Queen
  * and don't forget the unlikely King + Knight + Knight + Knight
  
  Assuming the lone King is attempting to avoid checkmate.
  
  > **Comments:**
  > **username_7**: King + Knight + Knight + Knight?  
  > **username_8**: @username_7 I doinked around with Nalimov endgame tables and could not find a case where three knights wasn't enough.  Editing.  
  > **username_7**: I never studied K+3N vs. K (and never saw it in a game!) bit I dimly recall that it was a win according to Fine's *Basic Chess Endings*.  
  
  ---
  
  ### Answer by username_2 on 2015-12-16. Score: 2
  
  As simple as a Knight or even a pawn, if you consider the fact that your opponent's pieces can block the escape squares too.
  
  Example:
  
  W: Kf1, Nf2
  
  B: Kh1, h2.
  
  The Assume that white played Nf2# in the last move. So, white has just used one knight to checkmate black king.
  
  > **Comments:**
  > **username_3**: The question specifies that the opponent has only the king left.  
  
  ---
  
  ### Answer by username_4 on 2015-12-16. Score: 1
  
  There are many answers to your question, 
  
  1) A rook 
  2) Any 2 minor pieces (Minor pieces:  Bishop, Night)
  3) A Queen
  4) 1 pawn :)
  
  > **Comments:**
  > **username_5**: All of those answer should include king. Also you cannot checkmate with only two knights and a king. (your 2nd case fails in that condition).  
  > **username_6**: @SaeedAmiri No, you can checkmate with two knights, it's possible just not forced. Your statement is therefore false.  
  > **username_5**: @StudentT, According to the question : "What are the minimum sets of pieces required", it means we are talking in the context of force mate. Also if you want interpret it like this (somehow funny), I should inform you it's even impossible to checkmate with two knights (as you wrote), they cannot cover required squares. You need at least one another piece to checkmate your opponent (e.g king).  
  > **username_7**: If the 2 minor pieces are bishops, they must be on opposite color squares.  
  
  ---
  
  