Longest Book Moves for Uncommon (Offbeat) Openings (no transitions)

1. a3

1. a4

1. b4

1. c3

1. d3

1. e3

1. f3

1. f4

1. g4

1. h3

1. h4

1. Na3

1. Nc3

1. Nh3

No moves are allowed that transpose to other e4, d4, c4, b3, g3, or Nf3 openings (such as a b4 Polish transposing to an Evans Gambit).

Also no transpositions to any other opening on the list (so an Anderssen transposing to a Polish like in 1. a3 e5 2. b4 would count as a Polish).

I have found an opening in the Grob’s: Grob Opening: Grob Gambit, Fritz Gambit, Romford Countergambit, 4.Bxb7 Nd7 5.Bxa8 Qxa8 (only one move in the Master Game database).

What else is there?

So I have 1. g4 d5 2. Bg2 Bxg4 3. c4 d4 4. Bxb7 Nd7 5. Bxa8 Qxa8 for the Grob, and 1. Nc3 d5 2. e3 e5 3. Qh5 Nf6 4. Qd1 Ng8 for the Van Geet. Anything longer or new?

If you you knew some of these openings at the master level you can easily get 20+ moves that will still be "book" for all intents and purposes