In sharp contrast to 1.d4 and 1.e4, the A00 openings threaten nothing. Even if White could play without an intervening move by Black (1.a4 -- 2.h4 is one horrible example), the position would not offer an overwhelming advantage. The worst of the A00 openings weaken White's position without any compensation. Which moves are the worst?
Let's return to the table of first moves. For the A00 openings, the last column shows a number instead of an ECO code. This number is a count of the games on the ChessLab database (the same source as the 'W%-B%-D%' column). A count of '>50' means that there are more games than can be captured by a single download. This lets us classify further the A00 openings.
The openings headed '1.b4 Sokolsky' are relatively popular openings where White and Black have approximately equal chances of winning the game. 1.g3 even preserves White's initial advantage.
The openings headed '1.a3 Anderssen' are also relatively popular, but White has ceded a substantial advantage to Black. It's a mystery why 1.h3 appears superior to 1.a3, or why 1.d3 is significantly better than 1.e3, but that's what the stats say.
The openings headed '1.a4 Ware' are unpopular openings, where the results confirm the unpopularity. What's the worst of the worst? It might be 1.f3, the Barnes Opening. This move neglects development, weakens further White's weakest square (f2), and blocks the best move for the Knight on g1. Can a single move do more positional harm?