Attribution
Stockfish
IgniteChess uses Stockfish for browser-based analysis and engine-driven play features, including review panels and practice modes where the engine calculates or replies to moves.
Stockfish is open source chess engine software. IgniteChess attributes Stockfish to the Stockfish project and its contributors, and we are grateful to the Stockfish team and community for making that work publicly available.
The self-hosted browser engine bundle shipped by IgniteChess is based on Stockfish.js and the Stockfish project. You can review the upstream projects and licensing information here:
Guess the Move Player Portraits
The Guess the Move player portraits are stored locally under /images/players/guess-the-move/. The listed JPG files also have locally generated WebP versions. Each linked Wikimedia Commons file page contains the full licence text and source metadata.
Lichess Puzzle Data
IgniteChess uses chess puzzle data and puzzle identifiers derived from Lichess puzzle content in order to power training sets, puzzle modes, and related solving flows across the site.
We attribute that puzzle source material to Lichess, and we are thankful to Lichess for supporting open chess tools and data resources that make projects like IgniteChess possible.
Blog Images
Selected blog images are stored locally under /images/blog/ and attributed to their Wikimedia Commons file pages. Each linked file page includes the full license text and source metadata supplied by the uploader.
| Image | Creator / source | License |
|---|---|---|
| Wikimedia Commons file page for steinitz-schumann-portrait.jpg / steinitz-schumann-portrait-{480,768,1200}.webpWilhelm Steinitz in a historical portrait by Fritz Schumann. The portrait is not identified as a photograph from this match. | Fritz Schumann / Cleveland Public Library, via DPLA | Public domain (file page); uncropped responsive WebP derivatives |
| Wikimedia Commons file page for botvinnik-1933-portrait.jpg / botvinnik-1933-portrait-{432}.webpMikhail Botvinnik in 1933, before his world championship reign. This portrait is not from the match. | Unknown photographer | Public domain (file page); uncropped responsive WebP derivatives |
| Wikimedia Commons file page for petrosian-1962-portrait.jpg / petrosian-1962-portrait-{480,768,1045}.webpTigran Petrosian in 1962, before he became world champion. This portrait is not from the match. | Harry Pot / Anefo | CC0; uncropped responsive WebP derivatives |
| Wikimedia Commons file page for karpov-kasparov-1986-plaque.jpg / karpov-kasparov-1986-plaque-480.webp / karpov-kasparov-1986-plaque-768.webp / karpov-kasparov-1986-plaque-1200.webpThe plaque at London’s Park Lane Hotel commemorating the 1986 championship’s London half, photographed in 2012. | Lovuschka | CC BY-SA 3.0; uncropped responsive WebP derivatives of the original photograph |
| Wikimedia Commons file page for kasparov-karpov-timman-1987.jpg / kasparov-karpov-timman-1987-480.webp / kasparov-karpov-timman-1987-768.webp / kasparov-karpov-timman-1987-1200.webpKasparov, Karpov and Timman in Amsterdam on 28 April 1987, before the Seville championship match. | Bart Molendijk / Anefo | CC0; uncropped responsive WebP derivatives of the original photograph |
| Wikimedia Commons file page for karpov-kasparov-1985.jpg / karpov-kasparov-1985-{480,500}.webpKasparov and Karpov at the 1985 World Championship | Copyright 2007, S.M.S.I., Inc. - Owen Williams, The Kasparov Agency. | CC BY-SA 3.0; uncropped responsive WebP derivatives |
| Wikimedia Commons file page for karpov-korchnoi-1981.png / karpov-korchnoi-1981-{480,768,824}.webpKarpov and Korchnoi at the start of game 1, Merano, 1 October 1981 | Isabel Hund | CC BY-SA 3.0; uncropped responsive WebP derivatives |
| Wikimedia Commons file page for korchnoi-merano-1981.png / korchnoi-merano-1981-{480,768,805}.webpKorchnoi before game 1, Merano, 1 October 1981 | Isabel Hund | CC BY-SA 3.0; uncropped responsive WebP derivatives |
| Wikimedia Commons file page for kasparov-1993-portrait.jpg / kasparov-1993-portrait-480.webp / kasparov-1993-portrait-491.webpGarry Kasparov in a 1993 portrait. | Copyright 2007, S.M.S.I., Inc. - Owen Williams, The Kasparov Agency. | CC BY-SA 3.0; uncropped responsive WebP derivatives of the original photograph |
| Wikimedia Commons file page for kasparov-anand-1995.jpg / kasparov-anand-1995-423.webpKasparov and Anand at their 1995 World Championship match at the World Trade Center. | Copyright 2007, S.M.S.I., Inc. - Owen Williams, The Kasparov Agency. | CC BY-SA 3.0; uncropped responsive WebP derivatives of the original photograph |
| Wikimedia Commons file page for kramnik-corus-2005.jpg / kramnik-corus-2005-480.webp / kramnik-corus-2005-752.webpVladimir Kramnik at the 2005 Corus tournament. This photograph is not from a world championship match. | steenslag | CC BY-SA 2.0; uncropped responsive WebP derivatives of the original photograph |
| Wikimedia Commons file page for anand-carlsen-2014.jpg / anand-carlsen-2014-{480,768,1100}.webpAnand and Carlsen at the championship closing events in Sochi, 25 November 2014. | Kremlin.ru | CC BY 4.0; responsive WebP derivatives of the original photograph |
| Wikimedia Commons file page for carlsen-2013-portrait.jpg / carlsen-2013-portrait-{480,768,1200}.webpMagnus Carlsen in January 2013, before his championship challenge in Chennai. This portrait is not from the match. | Stefan64 | CC BY-SA 3.0; responsive WebP derivatives of the original photograph |
| Wikimedia Commons file page for anand-gelfand-2012.jpg / anand-gelfand-2012-{480,768,1200}.webpThe entrance to the 2012 World Championship venue at Moscow’s Tretyakov Gallery, 10 May 2012. | Rodrigo Fernández | CC BY-SA 3.0; responsive WebP derivatives of the original photograph |
| Wikimedia Commons file page for anand-2010-portrait.jpg / anand-2010-portrait-{480,768,1200}.webpViswanathan Anand in 2010, the year of his title defence against Topalov. This portrait is not from the Sofia match. | Stefan64 | CC BY-SA 3.0; responsive WebP derivatives of the original photograph |
| Wikimedia Commons file page for anand-kramnik-2008.jpg / anand-kramnik-2008-{480,768,1200}.webpAnand and Kramnik at the 2008 World Championship in Bonn, 23 October 2008. | Ygrek | CC BY 3.0; responsive WebP derivatives of the original photograph |
| Wikimedia Commons file page for kasparov-2015-portrait.jpg / kasparov-2015-portrait-{480,768,1200}.webpGarry Kasparov, June 2015; portrait accompanying Linares 1999 | Fryta 73 | CC BY-SA 2.0; responsive WebP versions of the downloaded portrait |
| Wikimedia Commons file page for carlsen-2009-blitz.jpg / carlsen-2009-blitz-{480,768,1200}.webpMagnus Carlsen at the World Blitz Championship, 16 November 2009 | Sergey Rassokha | CC BY-SA 3.0; responsive WebP versions of the downloaded photograph |
| Wikimedia Commons file page for lasker-1929-portrait.jpg / lasker-1929-portrait-{480,546}.webpEmanuel Lasker, 19 March 1929 | Bundesarchiv, Bild 102-00457 / Unknown photographer | CC BY-SA 3.0 DE; responsive WebP versions of the downloaded portrait |
| Wikimedia Commons file page for san-remo-1930-group.jpg / san-remo-1930-group-{480,768,1200}.webpParticipants in the San Remo 1930 chess tournament | Unknown photographer | Public domain (resized and converted to WebP; no cropping) |
| Wikimedia Commons file page for fischer-1966-portrait.jpg / fischer-1966-portrait-{480,768,1200}.webpBobby Fischer, Associated Press portrait distributed in 1966 | John Lent / Associated Press | Public domain (resized and converted to WebP; no additional cropping) |
| Wikimedia Commons file page for karpov-2017-portrait.jpg / karpov-2017-portrait-{480,768,1200}.webpAnatoly Karpov in April 2017 | Veni Markovski | CC BY-SA 4.0 (resized and converted to WebP; no cropping) |
| Wikimedia Commons file page for alekhine-bain-portrait.jpg / alekhine-bain-portrait-{480,768,1200}.webpAlexander Alekhine, George Grantham Bain Collection portrait | George Grantham Bain Collection / Library of Congress | Public domain (resized and converted to WebP; no cropping) |
| Wikimedia Commons file page for carlsen-caruana-2018-game9.jpgMagnus Carlsen and Fabiano Caruana during game nine of the 2018 World Championship in London. Arbiter Stéphane Escafre stands to the left. | Pablo Martínez Rodríguez | CC BY-SA 4.0 (resized and converted to WebP; no cropping) |
| Wikimedia Commons file page for caruana-london-2018.jpgFabiano Caruana waits for Magnus Carlsen before game nine of the 2018 World Championship in London. | Pablo Martínez Rodríguez | CC BY-SA 4.0 (resized and converted to WebP; no cropping) |
| Wikimedia Commons file page for gukesh-candidates-2024.jpgGukesh at the 2024 Candidates Tournament in Toronto, where he earned the right to challenge Ding. | Eldar Azimov / Wikimedia Commons | CC BY-SA 4.0 (resized and converted to WebP; no cropping) |
| Wikimedia Commons file page for carlsen-karjakin-2016-game12.jpgMagnus Carlsen facing Sergey Karjakin in game 12 of the 2016 World Championship in New York. | Vladimir Barskij | CC BY-SA 3.0 (resized and converted to WebP; no cropping) |
| Wikimedia Commons file page for carlsen-karjakin-2016-press-conference.jpgCarlsen and Karjakin at the press conference after the 2016 rapid playoff. | Vladimir Barskij | CC BY-SA 3.0 (resized and converted to WebP; no cropping) |
| Wikimedia Commons file page for deep-blue-museum.jpgDeep Blue hardware at the Computer History Museum, photographed in 2011. | Anton Chiang | CC BY 2.0 (resized and converted to WebP; no cropping) |
| Wikimedia Commons file page for nepomniachtchi-ding-2023-handshake.jpgDing Liren and Ian Nepomniachtchi during the rapid playoff in Astana, 30 April 2023. | Eteri Kublashvili / ruchess.ru | CC BY-SA 3.0 (resized and converted to WebP; no cropping) |
| Wikimedia Commons file page for ding-2023-champion.jpgDing Liren at the press conference after his rapid playoff victory, 30 April 2023. | Eteri Kublashvili / ruchess.ru | CC BY-SA 3.0 (resized and converted to WebP; no cropping) |
| Wikimedia Commons file page for carlsen-nepomniachtchi-2021.jpgIan Nepomniachtchi and Magnus Carlsen at game 11 of the 2021 World Championship | Vladimir Barskij | CC BY-SA 3.0 (unchanged photograph) |
| Wikimedia Commons file page for Kasparov-1.jpgGarry Kasparov upon winning the World Chess Championship in 1985 | Copyright 2007, S.M.S.I., Inc. - Owen Williams, The Kasparov Agency | GFDL 1.2 or later / CC BY-SA 3.0 |
| Wikimedia Commons file page for Gukesh_in_2025.jpgGukesh Dommaraju during Tata Steel Chess Tournament 2025 | Frans Peeters | CC BY-SA 2.0 |
| Wikimedia Commons file page for Javokhir_Sindarov.jpgJavokhir Sindarov during the 45th Chess Olympiad | MiroJP | CC BY-SA 4.0 |
| Wikimedia Commons file page for FaustinoOroTata2025_fausting_oro.jpgFaustino Oro at Tata Steel Chess Tournament 2025 | Frans Peeters | CC BY-SA 2.0 |
| Wikimedia Commons file page for TataSteelChess2026-37_erdogmus.jpgYagiz Kaan Erdogmus vs Hans Niemann at Tata Steel Chess Tournament 2026 | Vysotsky (Wikimedia) | CC BY-SA 4.0 |
World Champions Images
World champion profile images are loaded from Wikimedia Commons. Each linked file page includes the full license text and any additional source metadata supplied by Wikimedia Commons.
World Blitz Championship Images
World Blitz Championship winner images are loaded from Wikimedia Commons. Each linked file page includes the full license text and any additional source metadata supplied by Wikimedia Commons.
| Image | Creator / source | License |
|---|---|---|
| Wikimedia Commons file page for Alexander Grischuk portrait | Przemyslaw Jahr / Wikimedia Commons | GFDL 1.2 or later / CC BY-SA 3.0 / CC BY-SA 2.5 |
| Wikimedia Commons file page for Vasyl Ivanchuk portrait | Petrokrs | CC BY-SA 4.0 |
| Wikimedia Commons file page for Leinier Dominguez portrait | Stefan64 | GFDL 1.2 or later / CC BY-SA 3.0 |
| Wikimedia Commons file page for Magnus Carlsen portrait | Miroslav Vajdic | CC BY 4.0 |
| Wikimedia Commons file page for Levon Aronian portrait | Frans Peeters | CC BY-SA 2.0 |
| Wikimedia Commons file page for Le Quang Liem portrait | Andreas Kontokanis | CC BY-SA 2.0 |
| Wikimedia Commons file page for Sergey Karjakin portrait | World Chess | Public domain |
| Wikimedia Commons file page for Maxime Vachier-Lagrave portrait | Andreas Kontokanis | CC BY-SA 2.0 |
| Wikimedia Commons file page for Ian Nepomniachtchi portrait | Etery Kublashvili | CC BY-SA 3.0 |
Women's World Champions Images
Women's world champion profile images are loaded from Wikimedia Commons when a suitable public file is available. Each linked file page includes the full license text and any additional source metadata supplied by Wikimedia Commons.
Questions
If you have questions about attribution or licensing notices on IgniteChess, please use the Contact page.