I was reading this question: How to know how good an opening defense scores, and it got me wondering...Have there been very lopsided opening scores in the lower levels. For example, if we found out that the
Halloween Gambit: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Nxe5 scores 90% in under 1800 level category it would be quite an anomaly.
One kind of an anomaly that I can think of at the top-level is the Traxler:
[FEN ""] 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4. Ng5 Bc5
According to chessgames database black scored 60.1 % wins and 15.9 % draws in 308 games. Of course we don't know relative strength of the players, maybe stronger players had black pieces.
Tony Ennis pointed out that according to 365chess.com there is no advantage for black in the Traxler.