Ordinary xy-exchange openings

These are openings without the white x-pawn and black y-pawn. No doubled pawns are allowed. My current classification program:

• Make a list of all ordinary xy-openings from Game Explorer for all fixed x and y.
• Compare them, in particular, calculating distances between them in HFZ http://www.chess.com/forum/view/chess-openings/distance-between-openings and other metrics.

Example: current list of ordinary ed-openings up to B22.

Van Geet Opening: Gruenfeld Defense (A00)
1.Nc3 d5 2.e4 dxe4 3.Nxe4 e5

Nimzowitsch Defense: El Columpio Defense, Exchange Variation (B00)
1.e4 Nc6 2.Nf3 Nf6 3.e5 Ng4 4.d4 d6 5.h3 Nh6 6.exd6 Qxd6

Nimzowitsch Defense: Scandinavian Variation, Exchange Variation (B00)
1.e4 Nc6 2.d4 d5 3.exd5 Qxd5

B01: Scandinavian Variations

Alekhine Defense: Modern Variation, Larsen Variation (B04)
1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 dxe5 5.Nxe5

Caro-Kann Defense: Alekhine Gambit Declined (B15)
1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6 5.Bd3 Nbd7

Caro-Kann Defense: Main Line (B15)
1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4

Caro-Kann Defense: Finnish Variation (B16)
1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 h6

B17-B19: Karpov and Classical Variations

Sicilian Defense: Alapin Variation, Barmen Defense (B22)
1.e4 c5 2.c3 d5 3.exd5 Qxd5

Sicilian Defense: Alapin Variation, Barmen Defense Modern Line (B22)
1.e4 c5 2.c3 d5 3.exd5 Qxd5 4.d4 Nf6 5.Nf3 Bg4