13.O-O, 16...O-O-O Bologan vs M Hansen, 2011  (B05) Alekhine's Defense, Modern, 36 moves, 1-0 13...O-O-O, 15.O-O Fischer vs V Kovacevic, 1970  (C15) French, Winawer, 30 moves, 0-1 15.O-O-O, 16...O-O J van Foreest vs Carlsen, 2019  (B33) Sicilian, 33 moves, 0-1 9...O-O 10.O-O-O C Yoo vs L Cernousek, 2018  (B90) Sicilian, Najdorf, 49 moves, 1-0 8.O-O-O, 14...O-O AlphaZero vs Stockfish, 2018   (B48) Sicilian, Taimanov Variation, 255 moves, 1/2-1/2 8.O-O-O 9...O-O Saric vs M Bosiocic, 2018  (B48) Sicilian, Taimanov Variation, 27 moves, 1-0 8...O-O, 14.O-O-O J Rosanes vs Anderssen, 1862  (C31) King's Gambit Declined, Falkbeer Counter Gambit, 19 moves, 0-1 5.O-O, 12...O-O-O W Pietzsch vs Spassky, 1962  (C79) Ruy Lopez, Steinitz Defense Deferred, 48 moves, 0-1 16.O-O-O, 19...O-O Golubev vs E Grabowski, 2004  (C40) King's Knight Opening, 106 moves, 1-0 13.O-O O-O-O J van Foreest vs Anand, 2019  (B13) Caro-Kann, Exchange, 28 moves, 0-1 7.O-O, 12...O-O-O H Raja vs T Banusz, 2018 (C76) Ruy Lopez, Modern Steinitz Defense, Fianchetto Variation, 40 moves, 1/2-1/2 8.O-O-O, 12...O-O S Kuipers vs L'Ami, 2019 (B62) Sicilian, Richter-Rauzer, 40 moves, 0-1 7.O-O, 15...O-O-O D Berczes vs Buhmann, 2017 (C07) French, Tarrasch, 30 moves, 1/2-1/2 14.O-O-O, 17...O-O A Esipenko vs Keymer, 2019  (B90) Sicilian, Najdorf, 38 moves, 1-0 4.O-O, 11...O-O-O Rapport vs Shankland, 2019  (A07) King's Indian Attack, 94 moves, 1/2-1/2 8.O-O-O, 13...O-O S Kuipers vs P Maghsoodloo, 2019  (B62) Sicilian, Richter-Rauzer, 41 moves, 0-1 17.O-O, 29...O-O-O Beliavsky vs M Kobalia, 2004 (D44) Queen's Gambit Declined Semi-Slav, 49 moves, 1/2-1/2 8.O-O-O, 14...O-O H Ni vs J Ye, 2004 (B48) Sicilian, Taimanov Variation, 46 moves, 1/2-1/2 9...O-O 10.O-O-O Z Almasi vs F Vallejo Pons, 2004 (B90) Sicilian, Najdorf, 63 moves, 1-0 16.O-O, 19...O-O-O Khalifman vs Serper, 1994  (D38) Queen's Gambit Declined, Ragozin Variation, 31 moves, 1-0 16.O-O-O O-O Anand vs Nepomniachtchi, 2019 (B96) Sicilian, Najdorf, 22 moves, 1/2-1/2 10.O-O-O O-O Pachman vs E Lundin, 1960  (D22) Queen's Gambit Accepted, 42 moves, 1-0 9...O-O, 22.O-O-O H Hamdouchi vs Kudrin, 2004 (B27) Sicilian, 43 moves, 0-1 8...O-O, 9.O-O-O A Lastin vs Azmaiparashvili, 2004 (C41) Philidor Defense, 68 moves, 1/2-1/2 5.O-O, 14...O-O-O Rublevsky vs Z Kozul, 2004  (B52) Sicilian, Canal-Sokolsky (Rossolimo) Attack, 51 moves, 0-1 13...O-O, 18.O-O-O A Fier vs Bacrot, 2017 (D31) Queen's Gambit Declined, 49 moves, 1/2-1/2 8...O-O, 13.O-O-O Lasker vs Pillsbury, 1900  (A83) Dutch, Staunton Gambit, 85 moves, 1-0 14...O-O-O 15.O-O Kamsky vs S Erenburg, 2014  (D00) Queen's Pawn Game, 34 moves, 1-0 10.O-O-O O-O V Kovalev vs D Saduakassova, 2019  (C42) Petrov Defense, 69 moves, 1-0 8.O-O, 17...O-O-O C Morrison vs M Basman, 1981  (B00) Uncommon King's Pawn Opening, 32 moves, 0-1 8.O-O-O O-O N Georgiadis vs A Yuksel, 2013  (B65) Sicilian, Richter-Rauzer Attack, 7...Be7 Defense, 9...Nxd4, 50 moves, 1-0 6.O-O, 13...O-O-O S R Mannion vs F Peralta, 2019  (B12) Caro-Kann Defense, 41 moves, 0-1 5.O-O, 14...O-O-O M Hansen vs V Prosviriakov, 2017  (C61) Ruy Lopez, Bird's Defense, 24 moves, 1-0 11.O-O-O, 12...O-O J van Foreest vs Nepomniachtchi, 2019  (B90) Sicilian, Najdorf, 60 moves, 1-0 7...O-O, 12.O-O-O Grischuk vs Filippov, 2004  (B31) Sicilian, Rossolimo Variation, 12 moves, 1/2-1/2 11.O-O, 15...O-O-O Kasimdzhanov vs Ivanchuk, 2004 (C11) French, 16 moves, 1/2-1/2 8.O-O-O, 19...O-O Z Almasi vs J Ye, 2004  (B48) Sicilian, Taimanov Variation, 38 moves, 1-0 11...O-O, 13.O-O-O Aronian vs P Smirnov, 2004  (D45) Queen's Gambit Declined Semi-Slav, 92 moves, 0-1 9...O-O, 17.O-O-O P Smirnov vs Aronian, 2004  (B04) Alekhine's Defense, Modern, 42 moves, 0-1 7...O-O, 13.O-O-O A Tari vs D Howell, 2017 (C45) Scotch Game, 29 moves, 1/2-1/2 7...O-O, 14.O-O-O Kazhgaleyev vs Ivanchuk, 2017 (D45) Queen's Gambit Declined Semi-Slav, 21 moves, 1/2-1/2 7.O-O, 13...O-O-O Y Gonzalez Vidal vs Harikrishna, 2017 (C07) French, Tarrasch, 80 moves, 1/2-1/2 4.O-O, 18...O-O-O Adams vs H Hamdouchi, 2004  (B30) Sicilian, 33 moves, 1-0 9.O-O, 15...O-O-O Nakamura vs A Lastin, 2004  (D47) Queen's Gambit Declined Semi-Slav, 52 moves, 1-0 8.O-O-O O-O Nisipeanu vs Kharlov, 2004 (B63) Sicilian, Richter-Rauzer Attack, 57 moves, 1-0 10.O-O-O, 17...O-O B Bok vs W Spoelman, 2014  (B47) Sicilian, Taimanov (Bastrikov) Variation, 31 moves, 1-0 5...O-O, 12.O-O-O Carlsen vs Radjabov, 2014  (E70) King's Indian, 51 moves, 0-1 12.O-O-O, 16...O-O Dreev vs Dominguez Perez, 2004 (D12) Queen's Gambit Declined Slav, 32 moves, 1/2-1/2 14.O-O-O, 16...O-O Duda vs Carlsen, 2015  (B92) Sicilian, Najdorf, Opocensky Variation, 42 moves, 0-1 11...O-O, 17.O-O-O Grischuk vs Kasimdzhanov, 2004 (D31) Queen's Gambit Declined, 52 moves, 1-0 5.O-O, 10...O-O-O Kasimdzhanov vs Grischuk, 2004  (C69) Ruy Lopez, Exchange, Gligoric Variation, 73 moves, 1-0 5.O-O, 18...O-O-O Dominguez Perez vs Radjabov, 2004  (B30) Sicilian, 45 moves, 1-0 19.O-O O-O-O Radjabov vs Dominguez Perez, 2004  (B96) Sicilian, Najdorf, 96 moves, 1/2-1/2 9.O-O-O O-O Adams vs V Akopian, 2004  (B90) Sicilian, Najdorf, 54 moves, 1-0 6.O-O, 15...O-O-O Radjabov vs Adams, 2004  (E04) Catalan, Open, 5.Nf3, 47 moves, 0-1 11.O-O-O, 18...O-O N Djukic vs Kasimdzhanov, 2008 (B18) Caro-Kann, Classical, 64 moves, 1/2-1/2 17.O-O-O, 19...O-O Radjabov vs Giri, 2019 (D31) Queen's Gambit Declined, 32 moves, 1/2-1/2 8...O-O, 9.O-O-O A Esipenko vs D Saduakassova, 2019  (C42) Petrov Defense, 24 moves, 1-0 9...O-O, 19.O-O-O Blatny vs A Zude, 1995 (D02) Queen's Pawn Game, 24 moves, 1-0 11...O-O, 15.O-O-O Spielmann vs Reti, 1919  (A52) Budapest Gambit, 31 moves, 1-0 12.O-O O-O-O Kmoch vs Capablanca, 1928  (E24) Nimzo-Indian, Samisch, 37 moves, 1/2-1/2 8...O-O, 16.O-O-O So vs N Grandelius, 2019  (B84) Sicilian, Scheveningen, 36 moves, 0-1 7.O-O, 19...O-O-O Aronian vs I Khamrakulov, 1996 (B40) Sicilian, 48 moves, 1-0 8.O-O-O, 18...O-O Keres vs Botvinnik, 1941  (E34) Nimzo-Indian, Classical, Noa Variation, 22 moves, 0-1 8...O-O, 10.O-O-O J Ceko vs C Liang, 2001  (B78) Sicilian, Dragon, Yugoslav Attack, 10.castle long, 38 moves, 0-1 11.O-O-O, 17...O-O Adams vs Kasparov, 2005  (B90) Sicilian, Najdorf, 26 moves, 0-1 9...O-O 10.O-O-O Karjakin vs Anand, 2006  (B90) Sicilian, Najdorf, 37 moves, 0-1 7...O-O, 9.O-O-O A Goganov vs D Andreikin, 2017 (C42) Petrov Defense, 43 moves, 0-1 7...O-O, 10.O-O-O Dubov vs Fridman, 2017 (C42) Petrov Defense, 40 moves, 1-0 8...O-O, 9.O-O-O W A Brown vs R Kneebone, 1985  (B89) Sicilian, 24 moves, 1-0 7.O-O, 16...O-O-O S Sjugirov vs Carlsen, 2010  (B12) Caro-Kann Defense, 25 moves, 1-0 9...O-O 10.O-O-O E Inarkiev vs S Sjugirov, 2009  (B90) Sicilian, Najdorf, 56 moves, 0-1 7...O-O, 12.O-O-O M Karthikeyan vs F Vallejo Pons, 2017  (B30) Sicilian, 45 moves, 1-0 13.O-O O-O-O Fischer vs Tal, 1960  (C18) French, Winawer, 21 moves, 1/2-1/2 11.O-O, 18...O-O-O J M Sprenger vs T Galinsky, 2019  (C16) French, Winawer, 48 moves, 1/2-1/2 8.O-O-O, 27...O-O Wei Yi vs J Stocek, 2018  (B69) Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 11.Bxf6, 32 moves, 0-1 14.O-O, 16...O-O-O V Fedoseev vs Y Bacallao Alonso, 2017  (B13) Caro-Kann, Exchange, 35 moves, 1-0 7.O-O, 11...O-O-O V Fedoseev vs Y Bacallao Alonso, 2017  (B13) Caro-Kann, Exchange, 25 moves, 1-0 5...O-O, 11.O-O-O E Inarkiev vs M Mchedlishvili, 2017  (B09) Pirc, Austrian Attack, 29 moves, 1-0 9.O-O-O O-O Reshevsky vs J Van Zante, 1921  (C62) Ruy Lopez, Old Steinitz Defense, 41 moves, 0-1 12.O-O-O, 17...O-O M Karthikeyan vs Nakamura, 2019  (B90) Sicilian, Najdorf, 43 moves, 0-1 11.O-O-O, 21...O-O Sevian vs Nisipeanu, 2017  (B12) Caro-Kann Defense, 35 moves, 1-0 10...O-O 11.O-O-O Spassky vs Westerinen, 1974  (C73) Ruy Lopez, Modern Steinitz Defense, 57 moves, 0-1 5.O-O, 20...O-O-O Lasker vs J Mason, 1889  (C46) Three Knights, 38 moves, 1/2-1/2 9...O-O, 18.O-O-O R Edouard vs T Casper, 2009  (A55) Old Indian, Main line, 60 moves, 0-1 8.O-O-O, 16...O-O Seirawan vs Timman, 1990  (E12) Queen's Indian, 26 moves, 1-0 8...O-O, 11.O-O-O Capablanca vs T A Carter, 1909  (C30) King's Gambit Declined, 30 moves, 1-0 8.O-O-O, 15...O-O Grischuk vs J Cori, 2017 (B48) Sicilian, Taimanov Variation, 44 moves, 1/2-1/2 9...O-O, 11.O-O-O I Cheparinov vs Navara, 2017 (C45) Scotch Game, 28 moves, 0-1 13.O-O, 16...O-O-O Steinitz vs C Golmayo, 1883  (C00) French Defense, 24 moves, 1-0 12.O-O, 13...O-O-O H Wang vs M Perunovic, 2015 (D12) Queen's Gambit Declined Slav, 57 moves, 1/2-1/2 10.O-O-O, 11...O-O D Anton Guijarro vs Nisipeanu, 2015 (D35) Queen's Gambit Declined, 48 moves, 1/2-1/2 16.O-O, 19...O-O-O Benko vs K Pytel, 1974  (D47) Queen's Gambit Declined Semi-Slav, 29 moves, 1-0 16.O-O O-O-O V Chekhover vs Suetin, 1951  (D47) Queen's Gambit Declined Semi-Slav, 51 moves, 1/2-1/2 11...O-O-O, 30.O-O Alexei Popov vs M Biyachuev, 2012 (C42) Petrov Defense, 37 moves, 1-0 10...O-O, 11.O-O-O Duda vs Ivanchuk, 2017  (C10) French, 21 moves, 1/2-1/2 7...O-O, 9.O-O-O Giri vs Motylev, 2017 (C42) Petrov Defense, 46 moves, 1/2-1/2 11...O-O-O 12.O-O S P Sethuraman vs Harikrishna, 2017 (C18) French, Winawer, 58 moves, 1/2-1/2 10.O-O-O, 12...O-O K M Ahmed vs Z Rahman, 1992 (D45) Queen's Gambit Declined Semi-Slav, 46 moves, 1/2-1/2 9.O-O-O, 13...O-O Kholmov vs Bronstein, 1965  (B99) Sicilian, Najdorf, 7...Be7 Main line, 34 moves, 1-0 12.O-O O-O-O Capablanca vs Tartakower, 1928  (A52) Budapest Gambit, 40 moves, 1-0 101 games