Opening trainer
Learn chess openings by playing them: pick a course, play the book moves on the board, and the board answers with the main replies. Free, no signup. Every line you play clean stays learned, and the counter keeps score — 73 courses, from the Sicilian to the London.
Sicilian Defense
253 lines · B20–B99 · you play Black
Ruy Lopez
154 lines · C60–C99 · you play White
French Defense
128 lines · C00–C19 · you play Black
Queen's Gambit Declined
124 lines · D02–D69 · you play Black
English Opening
115 lines · A10–C20 · you play White
Italian Game
114 lines · C50–C59 · you play White
King's Gambit Accepted
92 lines · C33–C39 · you play Black
Caro-Kann Defense
73 lines · B10–B19 · you play Black
King's Indian Defense
73 lines · E60–E99 · you play White
Nimzo-Indian Defense
55 lines · E20–E59 · you play Black
Queen's Pawn Game
50 lines · A40–D05 · you play White
Queen's Indian Defense
47 lines · E12–E19 · you play Black
Dutch Defense
43 lines · A80–A99 · you play Black
Semi-Slav Defense
40 lines · D30–D49 · you play Black
Queen's Gambit Accepted
39 lines · D20–D29 · you play Black
Grünfeld Defense
38 lines · A56–E60 · you play Black
Benoni Defense
37 lines · A40–A79 · you play Black
Indian Defense
37 lines · A43–E60 · you play Black
Alekhine Defense
36 lines · B02–B05 · you play Black
King's Gambit Declined
36 lines · C30–C32 · you play Black
Zukertort Opening
35 lines · A04–A41 · you play White
Nimzowitsch Defense
33 lines · B00–B00 · you play Black
Scotch Game
33 lines · C44–C45 · you play White
Pterodactyl Defense
31 lines · A40–B27 · you play Black
Van Geet Opening
30 lines · A00–C31 · you play White
Modern Defense
30 lines · A04–B27 · you play Black
Scandinavian Defense
30 lines · B01–B01 · you play Black
Petrov's Defense
30 lines · C42–C43 · you play Black
Slav Defense
30 lines · D10–D19 · you play Black
Philidor Defense
29 lines · C41–C41 · you play Black
Four Knights Game
29 lines · C47–C50 · you play Black
Réti Opening
28 lines · A09–A14 · you play White
King's Pawn Game
27 lines · B07–C44 · you play White
Bishop's Opening
27 lines · C23–C43 · you play White
Vienna Game
24 lines · C25–C29 · you play White
Bird Opening
23 lines · A02–B21 · you play White
Polish Opening
21 lines · A00–A05 · you play White
Catalan Opening
21 lines · E00–E09 · you play White
Hungarian Opening
17 lines · A00–A07 · you play White
Pirc Defense
17 lines · B00–B09 · you play Black
Blackmar-Diemer Gambit Accepted
17 lines · D00–D00 · you play Black
Tarrasch Defense
17 lines · D32–D34 · you play Black
King's Indian Attack
16 lines · A05–A08 · you play Black
Latvian Gambit
15 lines · C40–C44 · you play Black
Bogo-Indian Defense
15 lines · E11–E11 · you play Black
Blackmar-Diemer Gambit
13 lines · D00–D00 · you play White
Grob Opening
12 lines · A00–A00 · you play White
Neo-Grünfeld Defense
12 lines · D70–D79 · you play Black
Nimzo-Larsen Attack
11 lines · A01–A06 · you play White
Old Indian Defense
11 lines · A41–A55 · you play White
Vienna Gambit, with Max Lange Defense
10 lines · C25–C25 · you play White
Ponziani Opening
10 lines · C44–C44 · you play White
Rat Defense
9 lines · A41–C00 · you play White
Center Game
9 lines · C21–C22 · you play White
Kádas Opening
8 lines · A00–A00 · you play White
Benko Gambit Accepted
8 lines · A57–A59 · you play Black
Blackmar-Diemer Gambit Declined
8 lines · D00–D00 · you play Black
Englund Gambit
7 lines · A40–A40 · you play Black
Owen Defense
7 lines · B00–B00 · you play Black
Ware Opening
6 lines · A00–A00 · you play White
Trompowsky Attack
6 lines · A45–A45 · you play White
Benko Gambit Declined
6 lines · A57–A57 · you play White
Latvian Gambit Accepted
6 lines · C40–C40 · you play White
Barnes Opening
5 lines · A00–C20 · you play White
English Defense
5 lines · A40–A40 · you play Black
Benko Gambit
5 lines · A57–A59 · you play Black
Danish Gambit Accepted
5 lines · C21–C21 · you play Black
Richter-Veresov Attack
5 lines · D01–D01 · you play White
Van't Kruijs Opening
4 lines · A00–A00 · you play White
Borg Defense
4 lines · A40–B00 · you play Black
Englund Gambit Declined
4 lines · A40–A40 · you play White
Torre Attack
4 lines · A46–A48 · you play White
London System
4 lines · A48–D02 · you play White
How it works
- Pick a course and a side — you only ever play your own moves.
- The board answers with the main replies; you find the book move at every turn. A wrong move is simply not the book move here.
- Finish a line without mistakes or help and it stays learned. Learn every line and the course is done.
The lines come from real master play, grouped into courses by opening family — 253+ lines in the biggest one. When a game review tells you that you left book theory early, this is where you come to fix exactly that opening.