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Home * Knowledge * Opening Book * NIC-Key

a system of classification for chess openings, variations and subvariations by NICBase, New In Chess. Instead of the abstract ECO codes like 'A' to 'E', the openings are given lettercombinations that follow directly from the descriptive opening names, like 'SI" for the Sicilian Defence and 'KI' for the King's Indian Defence. Variations and subvariations are given numbercombinations that enable it to give every sub(sub)variation a unique code. The NIC-Key has been used internationally since 1984 and according to the NIC-site, is still evolving [1] .

Main Keys


NIC Opening Moves ECO
AL Alekhine's Defence 1.e4 Nf6 B02–B05
BI Benoni Defense 1.d4 Nf6 2.c4 c5 3.d5 A56–A79
CA Catalan Opening 1.d4 Nf6 2.c4 e6 3.g3 E00–E09
CK Caro-Kann Defence 1.e4 c6 B10–B19
EO English Opening 1.c4 A10-A39
FR French Defence 1.e4 e6 C00–C19
GI Grunfeld-Indian 1.d4 Nf6 2.c4 g6 3.Nc3 d5 D70–D99
HD Dutch Defence 1.d4 f5 A80–A99
IG Italian Game 1.e4 e5 2.Nf3 Nc6 3.Bc4 C50–C59
Bishop's Opening 1.e4 e5 2.Bc4 C23–C24
KF King's Fianchetto 1.e4 g6 B06
KG King's Gambit 1.e4 e5 2.f4 C30–C39
KI King's Indian 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 E70–E99
KP King's Pawn Openings 1.e4 e5 C20–C22
NI Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 E20–E59
OI Old Indian 1.d4 Nf6 2.c4 d6 A53–A55
PU Pirc Defence 1.e4 d6 B07–B09
QG Queen's Gambit Accepted 1.d4 d5 2.c4 dxc4 D20–D29
QI Queen's Indian 1.d4 Nf6 2.c4 e6 3.Nf3 b6 E12–E19
QO Queen's Gambit 1.d4 d5 2.c4 e6 D30–D69
QP Queen's Pawn Openings 1.d4 Nf6 A45–A52
1.d4 d5 D00–D09
1.d4 A40–A44
RE Reti Opening 1.Nf3 (d5 2.c4) A09
RG Russian Game-Petroff 1.e4 e5 2.Nf3 Nf6 C42–C43
RL Ruy Lopez-Spanish 1.e4 e5 2.Nf3 Nc6 3.Bb5 C60–C99
SD Scandinavian Defence 1.e4 d5 B01
SI Sicilian Defence 1.e4 c5 B20–B99
SL Slav Defence 1.d4 d5 2.c4 c6 D10–D19
Semi-Slav Defense 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 D43–D49
SO Scotch Opening 1.e4 e5 2.Nf3 Nc6 3.d4 C44–C45
TD Tarrasch Defence 1.d4 d5 2.c4 e6 (3.Nc3 c5) D32–D35
VG Vienna Game 1.e4 e5 2.Nc3 C25–C29
VO Various Openings 1.e4 B00

See also

External Links


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