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I recently started an online game as White beginning

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

And 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?

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3 Answers 3 I've been using this for my correspondence games at, hope this helps you.

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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.

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

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