user14122: If a player intentionally damages a chess set (e.g. breaks a piece in two, cracks the board, etc.), is there a specific penalty under FIDE rules? I'm not talking about moving pieces around surreptitiously or attempting to obscure the current game state, but something like a player getting angry and, while lawfully moving their knight, they bite it with their teeth, drool on it, or crack it with their hands before putting it back down.
It seems like it might fall under Rule 11.1, which provides

11.1 The players shall take no action that will bring the game of chess into disrepute.

According to 11.6, such a violation "shall lead to penalties in accordance with Article 12.9."
Would such an act fall under this general rule of sportsmanship, or is there a specific penalty (or specifically no penalty at all) for this?

user12523: First of all I would consider the Preface:

The Laws of Chess cannot cover all possible situations that may arise
  during a game, nor can they regulate all administrative questions.
  Where cases are not precisely regulated by an Article of the Laws, it
  should be possible to reach a correct decision by studying analogous
  situations which are regulated in the Laws.

I think it should be obvious that the sort of behavior you describe is wrong even if there is no rule that explicitly says "biting, drooling on, or cracking pieces is not allowed". :-)
But you can also consider

11.5. It is forbidden to distract or annoy the opponent in any manner whatsoever [...]

I don't think any arbiter would question your claim of being annoyed if your opponent is chewing on the pieces!

14122: <p>If a player intentionally damages a chess set (e.g. breaks a piece in two, cracks the board, etc.), is there a specific penalty under FIDE rules? I'm not talking about moving pieces around surreptitiously or attempting to obscure the current game state, but something like a player getting angry and, while lawfully moving their knight, they bite it with their teeth, drool on it, or crack it with their hands before putting it back down.</p>

<p>It seems like it <em>might</em> fall under <a href="https://www.fide.com/fide/handbook.html?id=208&amp;view=article" rel="noreferrer">Rule 11.1</a>, which provides</p>

<blockquote>
  <p>11.1 The players shall take no action that will bring the game of chess into disrepute.</p>
</blockquote>

<p>According to 11.6, such a violation "shall lead to penalties in accordance with Article 12.9."</p>

<p>Would such an act fall under this general rule of sportsmanship, or is there a specific penalty (or specifically no penalty at all) for this?</p>
 12523: <p>First of all I would consider the Preface:</p>

<blockquote>
  <p>The Laws of Chess cannot cover all possible situations that may arise
  during a game, nor can they regulate all administrative questions.
  Where cases are not precisely regulated by an Article of the Laws, it
  should be possible to reach a correct decision by studying analogous
  situations which are regulated in the Laws.</p>
</blockquote>

<p>I think it should be obvious that the sort of behavior you describe is wrong even if there is no rule that explicitly says "biting, drooling on, or cracking pieces is not allowed". :-)</p>

<p>But you can also consider</p>

<blockquote>
  <p>11.5. It is forbidden to distract or annoy the opponent in any manner whatsoever [...]</p>
</blockquote>

<p>I don't think any arbiter would question your claim of being annoyed if your opponent is chewing on the pieces!</p>
