user1894: Does anybody know a nice chess puzzle, where question states: "Exactly one piece is drawn incorrectly on this diagram, another piece must be drawn on it's position. Find incorrectly drawn piece."? One needs to make retrograde analysis of the given position and find, which from all pieces is drawn incorrectly.
I really would like to find such a puzzle. 

P.S. I would rather like to find Old puzzle like this than to see you creating a new one, because:

I understand that it is easy to create a simple puzzle like this. But this would be too simple.
When you try to create it, it is easy to miss some combination. Meanwhile old puzzles are checked "by time".

But if you really would like to try to create a nice puzzle like this - you are welcome.

user4221: Raymond Smullyan's Chess Mysteries of the Arabian Knights has some problems where one of the pieces is actually a different piece; you have to figure out which piece.
The problems there which fit this description appear to be these:
3 5 23 28 29 30 39 41 42 43

1894: <p>Does anybody know a nice chess puzzle, where question states: "Exactly one piece is drawn incorrectly on this diagram, another piece must be drawn on it's position. Find incorrectly drawn piece."? One needs to make retrograde analysis of the given position and find, which from all pieces is drawn incorrectly.</p>

<p>I really would like to find such a puzzle. </p>

<hr>

<p>P.S. I would rather like to <em>find</em> Old puzzle like this than to see you <em>creating</em> a new one, because:</p>

<ol>
<li><p>I understand that it is easy to create a simple puzzle like <a href="http://braingames.ru/chess/kw11pb22pb31pb33kb32rw21rw12.gif" rel="nofollow">this</a>. But this would be too simple.</p></li>
<li><p>When you try to create it, it is easy to miss some combination. Meanwhile old puzzles are checked "by time".</p></li>
</ol>

<p>But if you really would like to try to create a nice puzzle like this - you are welcome.</p>
 4221: <p>Raymond Smullyan's <em>Chess Mysteries of the Arabian Knights</em> has some problems where one of the pieces is actually a different piece; you have to figure out which piece.</p>

<p>The problems there which fit this description appear to be these:</p>

<p>3 5 23 28 29 30 39 41 42 43</p>
