user17401: So let's say I capture en passant with a pawn. Using the same pawn, I get to the 8th rank. Can I promote that pawn into anything else? I've heard of this restriction in various ways. Some say it can become a rook at best, and some say it just stays as a pawn, but it moves backwards. 
Please let me know if this is a classic case of "I'm losing better make some stuff," or an actual rule. 

user17408: The fact that a pawn has made an en passant capture does not alter or limit its capabilities at all, including its ability to promote to a queen or other piece when it reaches the eighth rank. 

user15365: For as long as I can remember, there has never been a rule like that in any official matter. The pawn captures en passant and lately it can promote like any other pawn.

user8214: From FIDE rules (3.7 e): 

When a pawn reaches the rank furthest from its starting position it must be exchanged as part of the same move on the same square for a new queen, rook, bishop or knight of the same colour. The player’s choice is not restricted to pieces that have been captured previously. This exchange of a pawn for another piece is called ‘promotion’ and the effect of the new piece is immediate.

There is no restrictions whatsoever about capturing en passant. 

17401: <p>So let's say I capture en passant with a pawn. Using the same pawn, I get to the 8th rank. Can I promote that pawn into anything else? I've heard of this restriction in various ways. Some say it can become a rook at best, and some say it just stays as a pawn, but it moves backwards. </p>

<p>Please let me know if this is a classic case of "I'm losing better make some stuff," or an actual rule. </p>
 17408: <p>The fact that a pawn has made an en passant capture does not alter or limit its capabilities at all, including its ability to promote to a queen or other piece when it reaches the eighth rank. </p>
 15365: <p>For as long as I can remember, there has never been a rule like that in any official matter. The pawn captures en passant and lately it can promote like any other pawn.</p>
 8214: <p>From FIDE rules (<a href="http://www.fide.com/fide/handbook?id=124&amp;view=article" rel="noreferrer">3.7 e</a>): </p>

<blockquote>
  <p>When a pawn reaches the rank furthest from its starting position it must be exchanged as part of the same move on the same square for a new queen, rook, bishop or knight of the same colour. The player’s choice is not restricted to pieces that have been captured previously. This exchange of a pawn for another piece is called ‘promotion’ and the effect of the new piece is immediate.</p>
</blockquote>

<p>There is no restrictions whatsoever about capturing en passant. </p>
