lichess-org/chess-openings: 2026.04.16 - Initial Release

First release of the chess openings dataset repo, for archival purposes and to facilitate versioning for the mobile app.

What's Changed

Making the file legal Json by @rpdelaney in https://github.com/lichess-org/chess-openings/pull/2

Proper names for players, who have non-ASCII characters in their names by @hauva69 in https://github.com/lichess-org/chess-openings/pull/3

Added human-readable, corrected list of ECO codes. by @louchesprocket in https://github.com/lichess-org/chess-openings/pull/6

Change formatting for Accepted and Declined gambits by @ChameleonTartu in https://github.com/lichess-org/chess-openings/pull/10

Fix various inconsistencies in names by @Rested in https://github.com/lichess-org/chess-openings/pull/11

Improvements to Kieseritzky Gambit by @fynsta in https://github.com/lichess-org/chess-openings/pull/13

Update a.tsv by @fynsta in https://github.com/lichess-org/chess-openings/pull/15

Modern Variations Cleanup by @fynsta in https://github.com/lichess-org/chess-openings/pull/17

Fix Caro-Kann Defense: Labahn Attack by @fynsta in https://github.com/lichess-org/chess-openings/pull/18

Some improvements by @fynsta in https://github.com/lichess-org/chess-openings/pull/19

Remove more inconsistencies by @fynsta in https://github.com/lichess-org/chess-openings/pull/20

Indian Game -> Indian Defense by @fynsta in https://github.com/lichess-org/chess-openings/pull/22

Fix Taimanov by @fynsta in https://github.com/lichess-org/chess-openings/pull/23

Correct Rhamphorhynchus spelling by @fynsta in https://github.com/lichess-org/chess-openings/pull/24

C41 Philidor Defense: Alapin-Blackburne gambit -> Albin-Blackburne by @benediktwerner in https://github.com/lichess-org/chess-openings/pull/25

Add JSON exporter by @pierotofy in https://github.com/lichess-org/chess-openings/pull/29

Change some commas to colons / make Nimzo-Larsen naming consistent by @dtpc in https://github.com/lichess-org/chess-openings/pull/33

add caro kann apocalypse attack by @cmgchess in https://github.com/lichess-org/chess-openings/pull/36

added Caro Kann : Campomanes Attack by @cmgchess in https://github.com/lichess-org/chess-openings/pull/37

added saemish gambit by @cmgchess in https://github.com/lichess-org/chess-openings/pull/38

Correct Vienna Gambit to have C29 by @benediktwerner in https://github.com/lichess-org/chess-openings/pull/39

remove independent C44: tayler opening by @cmgchess in https://github.com/lichess-org/chess-openings/pull/40

Some Nimzowitsch Defense fixes by @fynsta in https://github.com/lichess-org/chess-openings/pull/41

Add missing "Accepted" by @fynsta in https://github.com/lichess-org/chess-openings/pull/42

Change ECO A41 King's Pawn Game: Maróczy Defense to B07 by @cmgchess in https://github.com/lichess-org/chess-openings/pull/44

kid fianchetto benjamin defense A49->E61 by @cmgchess in https://github.com/lichess-org/chess-openings/pull/45

A10->E61 kid semi classical exchange + A80->D00 blackmar-diemer netherlands by @cmgchess in https://github.com/lichess-org/chess-openings/pull/47

Fixes #46 by @fynsta in https://github.com/lichess-org/chess-openings/pull/48

More fixes by @cmgchess in https://github.com/lichess-org/chess-openings/pull/49

zukertort reversed mexican A00->A06 by @cmgchess in https://github.com/lichess-org/chess-openings/pull/50

more fixes by @cmgchess in https://github.com/lichess-org/chess-openings/pull/51

Van Geet: Nowokunski confusion by @cmgchess in https://github.com/lichess-org/chess-openings/pull/53

more fixes by @cmgchess in https://github.com/lichess-org/chess-openings/pull/54

Morphy Gambit: e4 before d4 by @benediktwerner in https://github.com/lichess-org/chess-openings/pull/58

Make Maroczy Defense actually a King's Pawn Game by @benediktwerner in https://github.com/lichess-org/chess-openings/pull/59

Completed changes in accordance with #56 regarding the Giuco Piano. by @hitansh1299 in https://github.com/lichess-org/chess-openings/pull/61

Fix lint for the A and B lists. by @allanjoseph98 in https://github.com/lichess-org/chess-openings/pull/60

Use enumerate by @Masynchin in https://github.com/lichess-org/chess-openings/pull/63

Bastrikov quickfix by @allanjoseph98 in https://github.com/lichess-org/chess-openings/pull/64

Misc move order fixes by @allanjoseph98 in https://github.com/lichess-org/chess-openings/pull/65

De-dup the C,D and E lists. by @allanjoseph98 in https://github.com/lichess-org/chess-openings/pull/67

Delete openings with 0 games played by @allanjoseph98 in https://github.com/lichess-org/chess-openings/pull/69

Misc corrections by @allanjoseph98 in https://github.com/lichess-org/chess-openings/pull/68

Alekhine: Two pawn -> pawns by @benediktwerner in https://github.com/lichess-org/chess-openings/pull/70

Added Italian Game: Paris Defence by @sgen in https://github.com/lichess-org/chess-openings/pull/72

Blumenfeld countergambit was announced too early by @rizka10 in https://github.com/lichess-org/chess-openings/pull/73

qpg: Veresov Attack -> Richter-Veresov Attack by @SandroMartens in https://github.com/lichess-org/chess-openings/pull/74

Update d.tsv by @alexandru-duca in https://github.com/lichess-org/chess-openings/pull/75

Blackmar-Diemer Gambit move order by @alexandru-duca in https://github.com/lichess-org/chess-openings/pull/76

Scandinavian Defense: Portuguese Gambit by @alexandru-duca in https://github.com/lichess-org/chess-openings/pull/78

Blackmar-Diemer Gambit Overhaul by @alexandru-duca in https://github.com/lichess-org/chess-openings/pull/79

fix #80 by @cmgchess in https://github.com/lichess-org/chess-openings/pull/81

changed accelerated dragon simagin move order to start with 1.e4 by @cmgchess in https://github.com/lichess-org/chess-openings/pull/82

move order changes by @cmgchess in https://github.com/lichess-org/chess-openings/pull/83

More move order changes by @cmgchess in https://github.com/lichess-org/chess-openings/pull/84

Moscow Variation -> Canal Attack by @LesCyclopes in https://github.com/lichess-org/chess-openings/pull/85

Accelerated Fianchetto -> Accelerated Dragon by @LesCyclopes in https://github.com/lichess-org/chess-openings/pull/86

Organised some London lines by @SandroMartens in https://github.com/lichess-org/chess-openings/pull/87

Alekhine Defense: Exchange Variation, Voronezh Variation by @xaverh in https://github.com/lichess-org/chess-openings/pull/91

Scandinavian Defense: Valencian Variation by @sergi-nda in https://github.com/lichess-org/chess-openings/pull/93

Added the Dubov Tarrasch by @Zinkelburger in https://github.com/lichess-org/chess-openings/pull/100

+B30 Silician Defense: Portsmouth Gambit by @TheMadSword in https://github.com/lichess-org/chess-openings/pull/102

French Defense: Winawer Variation, Portisch-Hook Variation by @xaverh in https://github.com/lichess-org/chess-openings/pull/103

Indian Defense: Anti-Grünfeld, Basman-Williams Attack by @xaverh in https://github.com/lichess-org/chess-openings/pull/104

King's Gambit Accepted: Wagenbach Defense by @xaverh in https://github.com/lichess-org/chess-openings/pull/105

Sicilian Defense: Smith-Morra Gambit Accepted, Finegold Defense by @xaverh in https://github.com/lichess-org/chess-openings/pull/106

B50 kopec system by @cmgchess in https://github.com/lichess-org/chess-openings/pull/107

Valencian Variation: Add Ilundain Variation by @sergi-nda in https://github.com/lichess-org/chess-openings/pull/113

Valencian Variation: Add Main Line by @sergi-nda in https://github.com/lichess-org/chess-openings/pull/114

d10 slav exchange boor attack by @cmgchess in https://github.com/lichess-org/chess-openings/pull/116

Dutch stonewall vs classical by @SebasF1349 in https://github.com/lichess-org/chess-openings/pull/118

Four Knights Game: Spanish Variation fixes by @SebasF1349 in https://github.com/lichess-org/chess-openings/pull/120

Dutch fixes by @cmgchess in https://github.com/lichess-org/chess-openings/pull/121

Dutch move order fixes by @cmgchess in https://github.com/lichess-org/chess-openings/pull/122

Update d.tsv by @sergi-nda in https://github.com/lichess-org/chess-openings/pull/124

Alekhine Defense: Two Pawns Attack, Tate Variation by @xaverh in https://github.com/lichess-org/chess-openings/pull/125

Reversed Grünfeld by @xaverh in https://github.com/lichess-org/chess-openings/pull/126

move order fixes KID fianchetto by @cmgchess in https://github.com/lichess-org/chess-openings/pull/128

Kid fianchetto eco fixes by @cmgchess in https://github.com/lichess-org/chess-openings/pull/129

Move order fixes by @cmgchess in https://github.com/lichess-org/chess-openings/pull/130

Add E05 line (was mis-classified as E06) by @jdart1 in https://github.com/lichess-org/chess-openings/pull/132

B30 fixes by @jdart1 in https://github.com/lichess-org/chess-openings/pull/133

add A08 line (was mis-classified as A05) by @jdart1 in https://github.com/lichess-org/chess-openings/pull/135

add some Semi-Slav lines to better handle transpositions by @jdart1 in https://github.com/lichess-org/chess-openings/pull/136

add common A90 line by @jdart1 in https://github.com/lichess-org/chess-openings/pull/137

add A01 line (can be reached via transposition from 1. c4) by @jdart1 in https://github.com/lichess-org/chess-openings/pull/138

add a B13 line (can be reached by transposition) by @jdart1 in https://github.com/lichess-org/chess-openings/pull/139

add a common C54 line (currently misclassified as C50) by @jdart1 in https://github.com/lichess-org/chess-openings/pull/140

fix classification for Giuoco Piano/Two Knights (C53-C56), add some positions by @jdart1 in https://github.com/lichess-org/chess-openings/pull/141

Add some English Opening lines, to better handle transpositions by @jdart1 in https://github.com/lichess-org/chess-openings/pull/143

add a D85 line (can be reached by transposition) by @jdart1 in https://github.com/lichess-org/chess-openings/pull/145

Fix English Neo-Catalan Move Order by @cristivlas in https://github.com/lichess-org/chess-openings/pull/146

More English Opening Move Order Fixes by @cristivlas in https://github.com/lichess-org/chess-openings/pull/147

relocate A00 Van Geet Opening: Caro-Kann Variation, St. Patrick's Attack to the other Caro-Kann lines by @HaonRekcef in https://github.com/lichess-org/chess-openings/pull/148

Improve Move Orders for Rapport-Jobava London and Chigorin by @HaonRekcef in https://github.com/lichess-org/chess-openings/pull/149

fix move orders with e6 in the London by @HaonRekcef in https://github.com/lichess-org/chess-openings/pull/150

Add a D85 line. Lacking this some D85 are misclassified, e.g. as A34 by @jdart1 in https://github.com/lichess-org/chess-openings/pull/152

E43 fix by @jdart1 in https://github.com/lichess-org/chess-openings/pull/151

Add 'Adhiban Gambit' by @TheForkPower in https://github.com/lichess-org/chess-openings/pull/153

Add ultra-symmetrical English opening Variation by @TheForkPower in https://github.com/lichess-org/chess-openings/pull/154

Additional moves for the "Reversed Grünfeld" by @xaverh in https://github.com/lichess-org/chess-openings/pull/155

Barry Attack proper by @xaverh in https://github.com/lichess-org/chess-openings/pull/158

Additional line for move orders in the Anglo-Grünfeld by @xaverh in https://github.com/lichess-org/chess-openings/pull/159

Quade -> Quaade by @Malorra in https://github.com/lichess-org/chess-openings/pull/161

Additional line for Scotch Game: Lolli Variation by @xaverh in https://github.com/lichess-org/chess-openings/pull/160

C96 Ruy Lopez: Closed, Chigorin Defense, Gajewski Gambit by @xaverh in https://github.com/lichess-org/chess-openings/pull/162

Amar Gambit -> Paris Gambit by @Malorra in https://github.com/lichess-org/chess-openings/pull/163

Alien Gambit by @drainwordlee in https://github.com/lichess-org/chess-openings/pull/164

Adding Cologne Gambit and Celadon Variation by @Malorra in https://github.com/lichess-org/chess-openings/pull/165

Adding the Koola-Koola Variation: by @Malorra in https://github.com/lichess-org/chess-openings/pull/166

add B92 line by @jdart1 in https://github.com/lichess-org/chess-openings/pull/170

Add Siberian Variation by @Malorra in https://github.com/lichess-org/chess-openings/pull/171

Add Siberian Trap by @Malorra in https://github.com/lichess-org/chess-openings/pull/172

Remove redundant line in Danish Gambit by @Malorra in https://github.com/lichess-org/chess-openings/pull/175

Unify spelling Karlsbad -> Carlsbad by @xaverh in https://github.com/lichess-org/chess-openings/pull/178

add D45 line plus one for D46 by @jdart1 in https://github.com/lichess-org/chess-openings/pull/181

add C54 line by @jdart1 in https://github.com/lichess-org/chess-openings/pull/180

add Caro-Kann Endgame Offer & Endgame Variation by @jdart1 in https://github.com/lichess-org/chess-openings/pull/179

Fix https://github.com/lichess-org/lila/issues/15592 by @fynsta in https://github.com/lichess-org/chess-openings/pull/182

Remove unnecessary line by @Malorra in https://github.com/lichess-org/chess-openings/pull/183

Remove redundant line by @Malorra in https://github.com/lichess-org/chess-openings/pull/184

Small improvements by @Malorra in https://github.com/lichess-org/chess-openings/pull/185

add some Ponziani Opening lines by @jdart1 in https://github.com/lichess-org/chess-openings/pull/186

fixes for Bogo-Indian + Catalan by @jdart1 in https://github.com/lichess-org/chess-openings/pull/188

add some French Defense Classical/Steinitz lines with early ..a6 by @jdart1 in https://github.com/lichess-org/chess-openings/pull/189

add an A29 line by @jdart1 in https://github.com/lichess-org/chess-openings/pull/190

Added an A06 line by @EthanHiser in https://github.com/lichess-org/chess-openings/pull/199

Link to Hugging Face version by @cakiki in https://github.com/lichess-org/chess-openings/pull/201

Sorensen gambit issue #200 by @esmith1092 in https://github.com/lichess-org/chess-openings/pull/202

Update a.tsv by @ryathom57 in https://github.com/lichess-org/chess-openings/pull/203

English Opening fixes by @jdart1 in https://github.com/lichess-org/chess-openings/pull/204

Add Martian Gambit (B18) by @TheForkPower in https://github.com/lichess-org/chess-openings/pull/205

add some transpositions into D46 by @jdart1 in https://github.com/lichess-org/chess-openings/pull/206

add Delayed Alapin Variation by @jdart1 in https://github.com/lichess-org/chess-openings/pull/208

add a transposition into E04 by @jdart1 in https://github.com/lichess-org/chess-openings/pull/209

French Winawer: Poisoned Pawn, Eingorn and Warsaw variations by @seccohazy in https://github.com/lichess-org/chess-openings/pull/211

add a D11 line by @jdart1 in https://github.com/lichess-org/chess-openings/pull/212

Four Knights Game: Glek System by @seccohazy in https://github.com/lichess-org/chess-openings/pull/213

Small improvements in the Smith-Morra Gambit by @Malorra in https://github.com/lichess-org/chess-openings/pull/214

Correction for King's Gambit Accepted: Villemson Gambit by @seccohazy in https://github.com/lichess-org/chess-openings/pull/215

Add subvariations to Milner-Barry Gambit and King's Gambit Declined by @seccohazy in https://github.com/lichess-org/chess-openings/pull/216

Move order fixes in the French Defense by @seccohazy in https://github.com/lichess-org/chess-openings/pull/217

Nimzo-Indian Saemisch Variation starts after 4.a3 by @Allirey in https://github.com/lichess-org/chess-openings/pull/218

Corrections and additions in the Nimzo-Indian Defense by @seccohazy in https://github.com/lichess-org/chess-openings/pull/219

Consistency in the Nyezhmetdinov-Rossolimo Attack by @xaverh in https://github.com/lichess-org/chess-openings/pull/220

Guatemala Defense is part of Owen Defense by @Malorra in https://github.com/lichess-org/chess-openings/pull/221

Add Dilworth Gambit by @Zinkelburger in https://github.com/lichess-org/chess-openings/pull/222

Accomdate for move-orders in Semi-Slav defense v Rubinstein System by @xaverh in https://github.com/lichess-org/chess-openings/pull/223

e4 c5 2. Nc3 e6 3. d4 d5 is a French, by @hkopp in https://github.com/lichess-org/chess-openings/pull/225

Add a D24 line (was mis-classified as D37) by @jdart1 in https://github.com/lichess-org/chess-openings/pull/226

add a Worrall Attack line (C86) by @jdart1 in https://github.com/lichess-org/chess-openings/pull/229

Change Gedult Attack, Gedult Attack to Gedult Attack by @tigerros in https://github.com/lichess-org/chess-openings/pull/230

Add French Defense: Hecht-Reefschläger Variation by @seccohazy in https://github.com/lichess-org/chess-openings/pull/231

Nimzo Indian: Modern Variation, Romanishin Gambit by @seccohazy in https://github.com/lichess-org/chess-openings/pull/233

French Defense Classical fixes, add Shirov-Anand Variation by @seccohazy in https://github.com/lichess-org/chess-openings/pull/235

Update a.tsv by @ryathom57 in https://github.com/lichess-org/chess-openings/pull/236

add a C55 line by @jdart1 in https://github.com/lichess-org/chess-openings/pull/239

add some A29 lines with .. d6 by @jdart1 in https://github.com/lichess-org/chess-openings/pull/240

add some A65 lines by @jdart1 in https://github.com/lichess-org/chess-openings/pull/241

E38 + E59 updates by @jdart1 in https://github.com/lichess-org/chess-openings/pull/242

Add some A65 and E81 lines by @jdart1 in https://github.com/lichess-org/chess-openings/pull/243

B45 fixes by @jdart1 in https://github.com/lichess-org/chess-openings/pull/244

add some A48 lines by @jdart1 in https://github.com/lichess-org/chess-openings/pull/245

Add a C47 line (can be reached by transposition from Vienna Game) by @jdart1 in https://github.com/lichess-org/chess-openings/pull/246

reclassify/add some C18 and C19 lines by @jdart1 in https://github.com/lichess-org/chess-openings/pull/247

Add some C54 lines. by @jdart1 in https://github.com/lichess-org/chess-openings/pull/248

fixes for A11/A12/A14 by @jdart1 in https://github.com/lichess-org/chess-openings/pull/250

KID: Fianchetto Variation with Nf3 by @Frederico-Messa in https://github.com/lichess-org/chess-openings/pull/249

add some D45 and D46 lines by @jdart1 in https://github.com/lichess-org/chess-openings/pull/251

add C13 line by @jdart1 in https://github.com/lichess-org/chess-openings/pull/252

Fix French Defense Classical line by @seccohazy in https://github.com/lichess-org/chess-openings/pull/253

Revert "Fix French Defense Classical line" by @niklasf in https://github.com/lichess-org/chess-openings/pull/254

add a A48 line by @jdart1 in https://github.com/lichess-org/chess-openings/pull/255

add some C54 ines by @jdart1 in https://github.com/lichess-org/chess-openings/pull/256

Update c.tsv by @Chess4757 in https://github.com/lichess-org/chess-openings/pull/258

add some A37 lines by @jdart1 in https://github.com/lichess-org/chess-openings/pull/259

Added some B45 lines by @Chess4757 in https://github.com/lichess-org/chess-openings/pull/260

Fix some Polish opening and related lines by @jdart1 in https://github.com/lichess-org/chess-openings/pull/261

French Defense: Advance Variation, Kupreichik Variation by @xaverh in https://github.com/lichess-org/chess-openings/pull/263

C18 + C19 fixes by @jdart1 in https://github.com/lichess-org/chess-openings/pull/264

Added endgame variation for Semi-Tarrasch by @Chess4757 in https://github.com/lichess-org/chess-openings/pull/265

add some C19 lines by @jdart1 in https://github.com/lichess-org/chess-openings/pull/266

Added a C18, C54, and some C65 lines by @Chess4757 in https://github.com/lichess-org/chess-openings/pull/268

add D12 and D15 lines by @jdart1 in https://github.com/lichess-org/chess-openings/pull/269

Added some A07 lines by @Chess4757 in https://github.com/lichess-org/chess-openings/pull/270

add some A37 lines by @jdart1 in https://github.com/lichess-org/chess-openings/pull/275

McDonnell Attack, Toilet Variation by @LesCyclopes in https://github.com/lichess-org/chess-openings/pull/277

Four Knights Game: Naroditsky Variation by @LesCyclopes in https://github.com/lichess-org/chess-openings/pull/276

Sicilian Defense: Closed, Carlsen Variation by @LesCyclopes in https://github.com/lichess-org/chess-openings/pull/281

Albin Countergambit, Spassky Variation by @LesCyclopes in https://github.com/lichess-org/chess-openings/pull/278

Sicilian Defense: Alapin Variation, Anti-Alapin Gambit by @LesCyclopes in https://github.com/lichess-org/chess-openings/pull/282

Réti Opening: Advance Variation, Navara Gambit by @LesCyclopes in https://github.com/lichess-org/chess-openings/pull/283

Sicilian Defense: Dragon Variation, Hungarian Dragon by @LesCyclopes in https://github.com/lichess-org/chess-openings/pull/284

Add Caro-Kann Defense: Tartakower Variation, Perlis Line by @sergi-nda in https://github.com/lichess-org/chess-openings/pull/273

Sicilian Dragon, Yugoslav Attack, Chinese Dragon by @LesCyclopes in https://github.com/lichess-org/chess-openings/pull/285

Snyder Variation -> Czerniak Attack by @LesCyclopes in https://github.com/lichess-org/chess-openings/pull/287

Added the Carlsen Variation of the QGD by @Chess4757 in https://github.com/lichess-org/chess-openings/pull/289

Hyperaccelerated Fianchetto -> Hyperaccelerated Dragon by @LesCyclopes in https://github.com/lichess-org/chess-openings/pull/290

Added a C24 line by @Chess4757 in https://github.com/lichess-org/chess-openings/pull/291

Added D36, D53, D41, and D43 lines by @Chess4757 in https://github.com/lichess-org/chess-openings/pull/292

add a C83 line by @jdart1 in https://github.com/lichess-org/chess-openings/pull/293

Added B13 lines by @Chess4757 in https://github.com/lichess-org/chess-openings/pull/294

Added B77 and B78 lines by @Chess4757 in https://github.com/lichess-org/chess-openings/pull/297

c.tsv -- Ruy Lopez Steinitz Defense: transposition from Philidor Defense by @Panthee in https://github.com/lichess-org/chess-openings/pull/298

add some E11 lines by @jdart1 in https://github.com/lichess-org/chess-openings/pull/300

Added E57, E88, E81 and E71 lines by @Chess4757 in https://github.com/lichess-org/chess-openings/pull/304

E81 change by @Chess4757 in https://github.com/lichess-org/chess-openings/pull/308

Explain the filenames convention in README and CONTRIBUTING by @cakiki in https://github.com/lichess-org/chess-openings/pull/310

E14 and related fixes by @jdart1 in https://github.com/lichess-org/chess-openings/pull/311

Added Sicilian defense, Portland attack by @Chess4757 in https://github.com/lichess-org/chess-openings/pull/307

Add B30 anti-Sveshnikov starting position. by @jdart1 in https://github.com/lichess-org/chess-openings/pull/315

Added B07 line by @Chess4757 in https://github.com/lichess-org/chess-openings/pull/316

New Contributors

@rpdelaney made their first contribution in https://github.com/lichess-org/chess-openings/pull/2

@hauva69 made their first contribution in https://github.com/lichess-org/chess-openings/pull/3

@louchesprocket made their first contribution in https://github.com/lichess-org/chess-openings/pull/6

@ChameleonTartu made their first contribution in https://github.com/lichess-org/chess-openings/pull/10

@Rested made their first contribution in https://github.com/lichess-org/chess-openings/pull/11

@fynsta made their first contribution in https://github.com/lichess-org/chess-openings/pull/13

@benediktwerner made their first contribution in https://github.com/lichess-org/chess-openings/pull/25

@pierotofy made their first contribution in https://github.com/lichess-org/chess-openings/pull/29

@dtpc made their first contribution in https://github.com/lichess-org/chess-openings/pull/33

@cmgchess made their first contribution in https://github.com/lichess-org/chess-openings/pull/36

@hitansh1299 made their first contribution in https://github.com/lichess-org/chess-openings/pull/61

@allanjoseph98 made their first contribution in https://github.com/lichess-org/chess-openings/pull/60

@Masynchin made their first contribution in https://github.com/lichess-org/chess-openings/pull/63

@sgen made their first contribution in https://github.com/lichess-org/chess-openings/pull/72

@rizka10 made their first contribution in https://github.com/lichess-org/chess-openings/pull/73

@SandroMartens made their first contribution in https://github.com/lichess-org/chess-openings/pull/74

@alexandru-duca made their first contribution in https://github.com/lichess-org/chess-openings/pull/75

@LesCyclopes made their first contribution in https://github.com/lichess-org/chess-openings/pull/85

@xaverh made their first contribution in https://github.com/lichess-org/chess-openings/pull/91

@sergi-nda made their first contribution in https://github.com/lichess-org/chess-openings/pull/93

@Zinkelburger made their first contribution in https://github.com/lichess-org/chess-openings/pull/100

@TheMadSword made their first contribution in https://github.com/lichess-org/chess-openings/pull/102

@SebasF1349 made their first contribution in https://github.com/lichess-org/chess-openings/pull/118

@jdart1 made their first contribution in https://github.com/lichess-org/chess-openings/pull/132

@cristivlas made their first contribution in https://github.com/lichess-org/chess-openings/pull/146

@HaonRekcef made their first contribution in https://github.com/lichess-org/chess-openings/pull/148

@TheForkPower made their first contribution in https://github.com/lichess-org/chess-openings/pull/153

@Malorra made their first contribution in https://github.com/lichess-org/chess-openings/pull/161

@drainwordlee made their first contribution in https://github.com/lichess-org/chess-openings/pull/164

@EthanHiser made their first contribution in https://github.com/lichess-org/chess-openings/pull/199

@cakiki made their first contribution in https://github.com/lichess-org/chess-openings/pull/201

@esmith1092 made their first contribution in https://github.com/lichess-org/chess-openings/pull/202

@ryathom57 made their first contribution in https://github.com/lichess-org/chess-openings/pull/203

@seccohazy made their first contribution in https://github.com/lichess-org/chess-openings/pull/211

@Allirey made their first contribution in https://github.com/lichess-org/chess-openings/pull/218

@hkopp made their first contribution in https://github.com/lichess-org/chess-openings/pull/225

@tigerros made their first contribution in https://github.com/lichess-org/chess-openings/pull/230

@Frederico-Messa made their first contribution in https://github.com/lichess-org/chess-openings/pull/249

@niklasf made their first contribution in https://github.com/lichess-org/chess-openings/pull/254

@Chess4757 made their first contribution in https://github.com/lichess-org/chess-openings/pull/258

@Panthee made their first contribution in https://github.com/lichess-org/chess-openings/pull/298

Full Changelog: https://github.com/lichess-org/chess-openings/commits/2026.04.16