user12189: Playing a friendly game against my son (but with Touch-and-Move in force), I was going to promote a pawn to a queen, so I fished out my queen from among the captured pieces, and placed it on the eighth rank. But before removing my pawn to complete the move, I realised that this would lose me the game.
My question is: Am I required to complete the move, and promote to a queen? The law says that if I touch any piece on the board I must move or capture it. Does this situation count?

user17823: Yes, you should promote to a Queen forcibly. FIDE rules say that (emphasis mine):

4.4 If a player having the move:
[...]
4.4.4 promotes a pawn, the choice of the piece is finalised, when the piece has touched the square of promotion.

You placed the Queen in the promotion square, so you should promote to it.

However, I would suggest not to promote this way. Instead, you can move your pawn to the promotion square, then put the piece you want there.

12189: <p>Playing a friendly game against my son (but with Touch-and-Move in force), I was going to promote a pawn to a queen, so I fished out my queen from among the captured pieces, and placed it on the eighth rank. But before removing my pawn to complete the move, I realised that this would lose me the game.</p>

<p>My question is: Am I required to complete the move, and promote to a queen? The law says that if I touch any piece <em>on the board</em> I must move or capture it. Does this situation count?</p>
 17823: <p>Yes, you should promote to a Queen forcibly. FIDE rules say that (emphasis mine):</p>
<blockquote>
<p>4.4 If a player having the move:<br />
[...]<br />
4.4.4 promotes a pawn, the choice of the piece is finalised, <strong>when the piece has touched the square of promotion</strong>.</p>
</blockquote>
<p>You placed the Queen in the promotion square, so you should promote to it.</p>
<hr />
<p>However, I would suggest not to promote this way. Instead, you can move your pawn to the promotion square, then put the piece you want there.</p>
