Double King Pawn or Open Games (1.e4 e5).
Single King Pawn or Semi-Open Games (1.e4 other).
Double Queen Pawn or Closed Games (1.d4 d5).
Single Queen Pawn or Semi-Closed Games (1.d4 other).
Flank openings (including 1.c4, 1.Nf3, 1.f4, and others).
Unusual first moves, opening traps or irregular chess openings for White and Black.