user3131: I'm a chess player with ELO 1600. Now I'm trying to learn transpositions in chess. QGA is my favorite opening as white. But most of the time black chooses Queen's Gambit Declined. So now I'm trying to get to get QGA by transposition. Chess is all about positions. But I just want to know:
Are there any transpositions available in between QGA and other openings? 

user1485: One transposition white can try is from the French Exchange variation (if you know your opponent plays the French).
[FEN ""]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. c4 dxc4 (4... Nf6) 5. Bxc4

It transposes to the variation 1. d4 d5 2. c4 dxc4 3. e3 e5 4. Bxc4 exd4 5. exd4 from this question.
In the French move order, clever black players won't take the pawn on c4 already on move 4, but will wait until white plays Be2. If white then later regains a pawn with Bxc4, the bishop will have lost a tempo.

3131: <p>I'm a chess player with ELO 1600. Now I'm trying to learn transpositions in chess. QGA is my favorite opening as white. But most of the time black chooses Queen's Gambit Declined. So now I'm trying to get to get QGA by transposition. Chess is all about positions. But I just want to know:</p>

<p><strong>Are there any transpositions available in between QGA and other openings?</strong> </p>
 1485: <p>One transposition white can try is from the French Exchange variation (if you know your opponent plays the French).</p>

<pre><code>[FEN ""]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. c4 dxc4 (4... Nf6) 5. Bxc4
</code></pre>

<p>It transposes to the variation <code>1. d4 d5 2. c4 dxc4 3. e3 e5 4. Bxc4 exd4 5. exd4</code> from <a href="https://chess.stackexchange.com/questions/5627/best-continuation-for-this-counter-to-queens-gambit-accepted">this question</a>.</p>

<p>In the French move order, clever black players won't take the pawn on <code>c4</code> already on move 4, but will wait until white plays <code>Be2</code>. If white then later regains a pawn with <code>Bxc4</code>, the bishop will have lost a tempo.</p>
