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A45-A50 Queen's Pawn 1.d4 Nf6
A51-A52 Budapest Gambit
A53-A55 Old Indian Defence
A56 Czech Benoni
A57-A59 Benko/Volga Gambit
A60-A79 Modern Benoni
A80-A99 Dutch Defence
B00-B99 Semi-open games (not including the French defence)
o B00 King's Pawn Opening
o B01 Scandinavian Defence
o B02-B05 Alekhine Defence
o B06 Modern/Robatsch Defence
o B07-B09 Pirc Defence
o B10-B19 Caro-Kann Defence
o B20-B99 Sicilian Defence
C00-C99 Open games (including the French defence)
o C00-C19 French Defence
o C20 King's Pawn Game
o C21 Danish Gambit
o C22 Center Game
o C23-C24 Bishop's Opening
o C25-C29 Vienna Game
o C30-C32 King's Gambit Declined
o C33-C39 King's Gambit Accepted
o C40 Latvian Gambit
o C41 Philidor Defence
o C42-C43 Petroff Defence, 3.Nxe5
o C44 Ponziani Opening
o C45 Scotch Game
o C46 Three Knights' Game
o C47-C49 Four Knights' Game
o C50 Italian Game - Giuoco Pianissimo
o C51-C52 Evans' Gambit
o C53-C54 Giuoco Piano, 4.c3
o C55-C59 Two Knights' Defence
o C60-C99 Ruy Lopez
D00-D99 Closed and semi-closed games
o D00-D03 Queen's Pawn Game
o D04-D05 Colle System
o D06-D09 Queen's Gambit, Irregular
o D10-D19 Slav Defence
o D20-D29 Queen's Gambit Accepted
o D30 Queen's Gambit Declined: Slav
o D31 Queen's Gambit Declined: Semi-Slav
o D32-D34 Queen's Gambit Declined: Tarrasch Defence
o D35-D42 Queen's Gambit Declined
o D43-D49 Queen's Gambit Declined: Semi-Slav main line
o D50-D69 Queen's Gambit Declined: Classical
o D70-D99 Grünfeld Defence
E00-E99: Indian defences
o E00 Indian Defences
o E01-E09 Catalan Opening
o E10 Blumenfeld Gambit
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