user-1: I recently started an online game as White that began as follows.
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]
1. Nf3 f5  2. d3 Nc6  3. e4 e5

Here I deliberately decided to lose a tempo with 4. d4 and transpose into a Vienna reversed with the Black pieces.  I knew what I was doing and therefore was able to avail myself of various resources (books/databases) on the Vienna game, but this got me to wondering. Are there any databases against which you can enter a position, and it will also look for the reversed position? 

user885: Not to my knowledge. Although, a simple solution would be to manually input the moves with sides reversed.

user970: http://chessok.com/?page_id=352
I've been using this for my correspondence games at chess.com, hope this helps you.

user8309: Chessbase opening trees (ctg) detect white/black transpositions.  My database has 59 games starting 1.e3, 9 games where black answered 1...e5, but then 28000+ games for 2.e4.

-1: <p>I recently started an online game as White that began as follows.</p>

<pre><code>[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]
1. Nf3 f5  2. d3 Nc6  3. e4 e5
</code></pre>

<p>Here I deliberately decided to lose a tempo with 4. d4 and transpose into a Vienna reversed with the Black pieces.  I knew what I was doing and therefore was able to avail myself of various resources (books/databases) on the Vienna game, but this got me to wondering. Are there any databases against which you can enter a position, and it will also look for the reversed position? </p>
 885: <p>Not to my knowledge. Although, a simple solution would be to manually input the moves with sides reversed.</p>
 970: <p><a href="http://chessok.com/?page_id=352" rel="nofollow">http://chessok.com/?page_id=352</a>
I've been using this for my correspondence games at chess.com, hope this helps you.</p>
 8309: <p>Chessbase opening trees (ctg) detect white/black transpositions.  My database has 59 games starting 1.e3, 9 games where black answered 1...e5, but then 28000+ games for 2.e4.</p>
