| Name | ELO | Title | Federation | Games |
| Oppezzo, Sebastian | 2177 |
 Argentina
|
36 | |
| Oppici, Gabriele | 1930 |
 Italy
|
110 | |
| Oppitz, Peter | 1973 | CM |
 Germany
|
140 |
| Oprandi, William | 1864 |
 France
|
3 | |
| Opravil, Karel | 2007 |
 Czech Republic
|
44 | |
| Oprea, Erik | 2080 |
 Slovakia
|
236 | |
| Oprea, Sabina | 1856 |
 Romania
|
10 | |
| Oprisor, Razvan Gabriel | 2159 |
Romania
|
34 | |
| Opryshko, Stanislav | 2202 |
 Ukraine
|
23 | |
| Opseth, Philip | 1791 |
 Norway
|
2 | |
| Opychaneyj, German | 1863 |
Argentina
|
28 | |
| Oquendo, Eder | 1902 |
 Panama
|
2 | |
| Or, Yochanan | 1861 |
 Israel
|
10 | |
| Oragwu, Chukwunonso | 2129 | FM |
 Nigeria
|
31 |
| Orak, Ljubomir | 2263 | FM |
 Croatia
|
194 |
| Orak, Tugomir | 1923 |
Croatia
|
5 | |
| Oral, Tomas | 2489 | GM |
Czech Republic
|
1131 |
| Orani, Luigi Giuseppe | 1731 |
Italy
|
8 | |
| Oranje, Richard | 2004 |
 Netherlands
|
28 | |
| Orantes Taboada, Francisco | 2274 | FM |
 Spain
|
28 |
| Oratile, Kgotlane | 1960 |
 Botswana
|
9 | |
| Oratovsky, Michael | 2418 | GM |
Israel
|
713 |
| Orava, Aleksander | 1942 |
 Estonia
|
25 | |
| Orava, Alexandra | 1852 |
 Russian Federation
|
4 | |
| Oravecz, Imre | 1801 |
 Hungary
|
42 | |
| Orazov, Batyr | 2280 | FM |
 Turkmenistan
|
10 |
| Orban, Andreas | 2164 |
Germany
|
57 | |
| Orban, Istvan | 1782 |
Hungary
|
17 | |
| Orban, Tibor | 1939 |
Romania
|
5 | |
| Orban, Zoltan | 1742 |
Hungary
|
42 | |
| Orbezo Rosales, Ximena Lucia | 1891 |
 Peru
|
17 | |
| Orcera Gomez, Francisco | 1723 |
Spain
|
33 | |
| Orciuch, Leszek | 1917 |
 Poland
|
11 | |
| Ordaz Valdes, Lisandra | 2284 | WIM |
 Cuba
|
219 |
| Ordenes, Sergio | 2071 |
 Chile
|
30 | |
| Ordenes Segovia, Sergio | 1923 |
Chile
|
4 | |
| Ordian, Vrej | 2363 | FM |
 Armenia
|
13 |
| Ordiz Fernandez, Roque | 2064 |
Spain
|
1 | |
| Ordobas Martinez, Vicens | 2039 |
Spain
|
21 | |
| Ordog, Robert | 1894 |
Romania
|
9 | |
| Ordonez, Aldison | 1981 |
 Ecuador
|
6 | |
| Ordonez, Francisco | 2277 | FM |
 Venezuela
|
58 |
| Ordonez, Gustavo | 2032 |
Chile
|
15 | |
| Ordonez, Luis | 1918 |
 Colombia
|
5 | |
| Ordonez Gonzalez, Gabriel | 1981 |
Colombia
|
7 | |
| Ordonez Torres, Jesus | 2010 |
Spain
|
4 | |
| Ordonez Torres, Maria Del Carmen | 2044 | WFM |
Spain
|
1 |
| Ordu, Armin | 1828 |
Germany
|
3 | |
| Ordunez Echarte, Dennys | 2127 | FM |
Cuba
|
35 |
| Ore Manrique de Lara, Julius | 1918 |
Spain
|
9 | |
| Orefice, Nino | 2051 |
Italy
|
6 | |
| Orehek, Spela | 2034 | WFM |
 Slovenia
|
91 |
| Orehovec, Ivan | 1803 |
Croatia
|
10 | |
| Orejuela, Cristina | 1774 |
Ecuador
|
14 | |
| Orejuela Chango, Paulina | 2036 | WFM |
Ecuador
|
28 |
| Orekhov, Evgeny | 2432 |
Russian Federation
|
22 | |
| Orekhov, Nikolai | 2206 |
Russian Federation
|
18 | |
| Orekhov, Stepan | 2087 |
Russian Federation
|
1 | |
| Orekhov, Viktor | 2138 |
Russian Federation
|
18 | |
| Orel, Anze | 2007 |
Slovenia
|
87 | |
| Orel, Josef | 1958 |
Czech Republic
|
21 | |
| Orel, Karmen | 1969 |
Slovenia
|
176 | |
| Orel, Oskar | 2305 | FM |
Slovenia
|
352 |
| Orel, Simona | 1991 | WFM |
Slovenia
|
154 |
| Orellana Escobar, Ricard | 1965 |
Spain
|
1 | |
| Orellana Iglesias, Julio | 1816 |
Spain
|
1 | |
| Oren, Ido | 2200 |
Israel
|
5 | |
| Orenda, Omar | 2092 |
Croatia
|
77 | |
| Oreopoulos, Konstantinos | 2272 |
 Greece
|
86 | |
| Oreshenkov, Viktor | 1981 |
Russian Federation
|
9 | |
| Oreshkin, Artem | 2020 |
Russian Federation
|
13 | |
| Oreshkin, Vladislav | 1924 |
Spain
|
1 | |
| Oresick, Robert | 1136 |
 United States
|
3 | |
| Oreskovic, Andelko | 1843 |
 Austria
|
9 | |
| Oreskovic, Milan | 1970 |
Croatia
|
15 | |
| Oreskovic, Pero | 1916 |
Croatia
|
54 | |
| Oresky, Jan | 2227 |
Czech Republic
|
80 | |
| Orev, Bozhidar | 1866 |
 Bulgaria
|
4 | |
| Orev, Petar | 2029 | IM |
Bulgaria
|
277 |
| Orf, Markus | 2185 |
Germany
|
29 | |
| Orfalea, Mark A | 2215 |
United States
|
6 | |
| Orfali, Marcelo Rafael | 2017 |
Italy
|
60 | |
| Orfanos, Lefteris | 2124 |
Greece
|
34 | |
| Orfei, Rolando | 1958 |
Italy
|
24 | |
| Orfini, Nicolo` | 2209 |
Italy
|
43 | |
| Organdziev, Oliver | 2270 | FM |
 Macedonia
|
206 |
| Organisciak, Wojciech | 2009 |
Poland
|
27 | |
| Orgil, Gantumur | 2097 |
 Mongolia
|
8 | |
| Orgler, Philipp | 2007 |
Austria
|
33 | |
| Orgon, Dusan | 2005 |
Slovakia
|
120 | |
| Orgovan, Sandor | 2144 | IM |
Hungary
|
218 |
| Orhan, Eda | 1835 |
Germany
|
88 | |
| Orhan, Zilan | 1957 |
Germany
|
50 | |
| Ori, Marco | 2111 |
Italy
|
124 | |
| Oria Blasco, Alberto | 1867 |
Spain
|
166 | |
| Orian, Noga | 2099 | WFM |
Israel
|
16 |
| Orieux, Etienne | 2152 |
France
|
1 | |
| Orincic, Damir | 1882 |
Croatia
|
2 | |
| Orio, Lars | 1919 |
 Denmark
|
12 | |
| Orio, Rogelio L | 1851 | CM |
 Guam
|
38 |
| Orio Ferrer, Inaki | 1813 |
Spain
|
2 | |
| Orione, Carlos | 2129 |
Argentina
|
32 | |
| Oriot, Patrice | 1947 |
France
|
1 | |
| Orival, Jean | 1438 |
France
|
2 | |
| Orizondo, Hugo | 2004 |
 Dominican Republic
|
23 | |
| Orlandi, Xavier | 2011 |
France
|
18 | |
| Orlando, Luigi | 1901 |
Italy
|
34 | |
| Orlicek, Karel | 1750 |
Czech Republic
|
42 | |
| Orlina, Laura | 1818 |
 Latvia
|
7 | |
| Orlinkov, Maxim L | 2297 | IM |
Russian Federation
|
112 |
| Orlov, Anatoly | 1996 |
Russian Federation
|
34 | |
| Orlov, Andrey | 1649 | GM |
 Fide
|
385 |
| Orlov, Evgeny | 2170 |
Russian Federation
|
12 | |
| Orlov, Georgi | 2446 | IM |
United States
|
401 |
| Orlov, Igor | 1414 |
Russian Federation
|
1 | |
| Orlov, Konstantin | 2175 | FM |
 Serbia
|
51 |
| Orlov, Nikolay | 2191 |
Russian Federation
|
19 | |
| Orlov, Nikolay I | 2285 | FM |
Russian Federation
|
30 |
| Orlov, O. | 2169 |
Russian Federation
|
9 | |
| Orlov, Oleg | 2254 | FM |
Russian Federation
|
71 |
| Orlov, Pavle | 2234 | IM |
Serbia
|
175 |
| Orlov, Sergei | 1759 |
Russian Federation
|
3 | |
| Orlov, Vassily | 2379 | IM |
Russian Federation
|
265 |
| Orlov, Vsevolod | 2245 |
Russian Federation
|
21 | |
| Orlova, Inna | 2040 |
Italy
|
19 | |
| Orlova, Yelizaveta | 1936 | WCM |
 Canada
|
28 |
| Orlovic, Isa | 1830 |
France
|
13 | |
| Orlovic, Lucie | 1414 |
France
|
8 | |
| Orlovska, Madara | 2067 |
Latvia
|
15 | |
| Orlovtsev, Alexander | 1772 |
Russian Federation
|
8 | |
| Orlowski, Juergen | 2209 | FM |
Germany
|
94 |
| Orlowski, Miroslaw | 1600 |
Poland
|
6 | |
| Orlowski, Ryszard | 2202 |
Poland
|
2 | |
| Orlowski, Thomas | 1815 |
Germany
|
3 | |
| Orlyanskaya, Darya | 1993 | WFM |
Ukraine
|
192 |
| Ormerod, Stephen | 1797 |
 United Kingdom
|
3 | |
| Ormos, Gaszton | 1991 |
Hungary
|
48 | |
| Ormsby, Alan | 1914 | 44 | ||
| Orna, Jan | 1647 |
Czech Republic
|
20 | |
| Orndahl, Markus | 2187 |
 Sweden
|
90 | |
| Orndahl, Mats | 2129 |
Sweden
|
11 | |
| Ornet, Tomas | 1792 |
Czech Republic
|
2 | |
| Ornia Nuno, Alberto | 1703 |
Spain
|
9 | |
| Ornithopoulos, Nikolaos | 1839 |
Greece
|
89 | |
| Ornjakov, Vlada | 1962 |
Serbia
|
9 | |
| Ornolfsson, Magnus P | 2162 |
 Iceland
|
70 | |
| Ornovetsky, Mikhail | 2011 |
 Moldova
|
11 | |
| Ornstein, Axel | 2197 | IM |
Sweden
|
1144 |
| Ornstein, Petra | 2021 |
Sweden
|
141 | |
| Oro, Faustino | 2330 | FM |
Argentina
|
93 |
| Name | ELO | Title | Federation | Games |
| Oro, Luis | 2255 |
Argentina
|
21 | |
| Orolin, Peter | 2028 |
Slovakia
|
16 | |
| Oros, Robert | 2259 | FM |
Ukraine
|
69 |
| Orosa Martinez, Victor | 2061 |
Spain
|
11 | |
| Orosz, Andras | 2219 | FM |
Hungary
|
145 |
| Orosz, Klara | 1896 |
Hungary
|
2 | |
| Orosz, Laszlo | 1959 |
Hungary
|
10 | |
| Oroudzhov, Anar | 2060 |
Russian Federation
|
21 | |
| Orozbaev, Eldiar | 2341 | FM |
 Kyrgyzstan
|
98 |
| Orozco, Carlos | 1647 |
Argentina
|
11 | |
| Orozco, Gustavo | 2216 |
Argentina
|
18 | |
| Orozco, Lina Yomayra | 2022 | WIM |
Colombia
|
11 |
| Orozco, Luz Elena | 2059 | WFM |
Colombia
|
20 |
| Orozco, Rafael | 1980 |
France
|
23 | |
| Orpinas, Claudio | 2220 |
Chile
|
31 | |
| Orr, Mark J L | 2121 | IM |
 Ireland
|
431 |
| Orra Noguera, Francisco | 1846 |
Spain
|
8 | |
| Orrego, Dorance | 2122 |
Colombia
|
33 | |
| Orriols Brunetti, Marc | 2038 |
Spain
|
9 | |
| Orriols Codina, Joan | 1728 |
Spain
|
12 | |
| Orriols Miro, Clara | 1999 |
Spain
|
66 | |
| Orsag, Milan | 2039 |
Slovakia
|
709 | |
| Orsag, Miroslav | 2157 |
Czech Republic
|
81 | |
| Orsagova, Erika | 1970 | WCM |
Slovakia
|
96 |
| Orsagova, Silvie | 2016 | WIM |
Czech Republic
|
5 |
| Orsario, Wolfgang | 1735 |
Austria
|
36 | |
| Orsatti, Felicitas | 1754 |
Argentina
|
34 | |
| Orsatti, Marcello | 1969 |
Italy
|
9 | |
| Orschulik, Nils | 1943 |
Germany
|
45 | |
| Orsenigo, Davide | 1885 |
Italy
|
27 | |
| Orseth, Dag S | 2270 |
Norway
|
62 | |
| Orsher, Ilya | 2189 |
United States
|
51 | |
| Orshonova, Elena | 1992 | WFM |
Russian Federation
|
12 |
| Orsi, Lorenzo | 1891 |
Italy
|
7 | |
| Orsi, Massimiliano | 1989 |
Italy
|
49 | |
| Orsi, Matteo | 1735 |
Italy
|
6 | |
| Orsini, Antonio | 2353 | FM |
Argentina
|
109 |
| Orsini, Julien | 1727 |
France
|
1 | |
| Orsnes, Oddbjorn | 1856 |
Norway
|
2 | |
| Orso, Janos | 1990 | FM |
Hungary
|
125 |
| Orso, Miklos | 2160 | IM |
Hungary
|
727 |
| Orsolic, Marijan | 2120 |
Germany
|
17 | |
| Orsoni, Jean Philippe | 1880 |
France
|
73 | |
| Orta Vazquez, Mario | 1630 |
Spain
|
1 | |
| Ortartchiev, Gadji | 1980 |
 Belgium
|
18 | |
| Ortega, Anthony | 2128 |
United States
|
28 | |
| Ortega, Diana | 2081 |
Colombia
|
6 | |
| Ortega, Francois | 2199 |
France
|
25 | |
| Ortega, Irvin | 2283 |
 Philippines
|
1 | |
| Ortega, Jaime | 1914 |
Peru
|
1 | |
| Ortega, Lexy | 2399 | GM |
Italy
|
963 |
| Ortega, Renato | 2034 |
Chile
|
4 | |
| Ortega, Ricardo | 1760 |
 Mexico
|
2 | |
| Ortega Amarelle, Mariano | 2473 | IM |
 Cape Verde
|
174 |
| Ortega Andres, Fernando | 1840 |
Spain
|
8 | |
| Ortega Calzada, Jesus Jose | 2017 |
Mexico
|
6 | |
| Ortega Fernandez, Antonio | 1964 |
Spain
|
1 | |
| Ortega Fuentes, Luis Angel | 2156 |
Spain
|
41 | |
| Ortega Gadea, Santiago | 1952 |
Spain
|
33 | |
| Ortega Garcia, Francisco | 1989 |
Spain
|
14 | |
| Ortega Garcia, Laia | 1936 |
Spain
|
43 | |
| Ortega Gascon, Ignacio | 1917 |
Spain
|
1 | |
| Ortega Gonzalez, Jose Luis | 1953 |
Spain
|
56 | |
| Ortega Hermida, Daniel | 2351 | IM |
Spain
|
170 |
| Ortega Izquierdo, Alejandro | 2313 | FM |
Spain
|
90 |
| Ortega Lopez, Adrian | 1922 |
Spain
|
5 | |
| Ortega Lopez, Manuel | 1836 |
Spain
|
13 | |
| Ortega Lopez, Mikel | 2198 | FM |
Spain
|
0 |
| Ortega Mendoza, Josep | 1737 |
Spain
|
8 | |
| Ortega Molina, Tomas | 1754 |
Spain
|
12 | |
| Ortega Morales, Javier | 1878 |
Argentina
|
41 | |
| Ortega Morales, Pedro | 1785 |
Spain
|
61 | |
| Ortega Moreno, Antonio Miguel | 1907 |
Spain
|
14 | |
| Ortega Nadera, Ludy | 2005 |
Philippines
|
10 | |
| Ortega Osorio, Josep | 2057 |
Spain
|
1 | |
| Ortega Pujol, Joan | 1951 |
Spain
|
2 | |
| Ortega Ruiz, Jose Miguel | 2350 | FM |
Spain
|
221 |
| Ortega Salvador, Rafael | 1778 |
Spain
|
3 | |
| Ortega Sanchez, Ainhoa | 1847 |
Spain
|
3 | |
| Ortega Serra, Marc | 2291 |
Spain
|
69 | |
| Ortega Valle, Jose Ramon | 2042 | CM |
Spain
|
33 |
| Ortel, Endre | 2175 | FM |
Hungary
|
138 |
| Ortells Perez, Victor | 2028 | CM |
Spain
|
66 |
| Orteu Capdevila, Max | 2182 |
Spain
|
20 | |
| Ortez, Andrea | 1926 | WIM |
 El Salvador
|
37 |
| Orth, Reiner | 1812 |
Germany
|
6 | |
| Orth, Roman | 2057 |
Germany
|
135 | |
| Orthmann, Dirk | 1835 |
 Switzerland
|
6 | |
| Orti Boix, Miquel Lluis | 1830 |
Spain
|
3 | |
| Orti Camany, Vicente Jose | 1941 |
Spain
|
17 | |
| Ortigala, Gonzalo | 1881 |
Argentina
|
12 | |
| Ortin Blanco, Ainhoa | 1945 | WFM |
Spain
|
8 |
| Ortin Blanco, Inigo | 2286 | FM |
Spain
|
5 |
| Ortinau, Helmut | 2180 |
Germany
|
58 | |
| Ortinau, Peter | 2061 |
Germany
|
57 | |
| Ortiz, Andres | 1876 |
Argentina
|
27 | |
| Ortiz, Eduardo | 2239 |
Philippines
|
60 | |
| Ortiz, Hugo | 1662 |
Canada
|
2 | |
| Ortiz, Israel | 1760 |
Argentina
|
2 | |
| Ortiz, Jorge | 1890 |
Argentina
|
25 | |
| Ortiz, Katherine Berenice | 1905 | WFM |
 Honduras
|
28 |
| Ortiz, Marcos | 2197 |
 Nicaragua
|
28 | |
| Ortiz, Miguel | 2305 |
United States
|
6 | |
| Ortiz, Nadya Karolina | 2153 | WGM |
Colombia
|
304 |
| Ortiz, Nelson | 2028 |
Dominican Republic
|
1 | |
| Ortiz, Olson | 2294 | FM |
Dominican Republic
|
4 |
| Ortiz, Oscar | 2003 |
Ecuador
|
15 | |
| Ortiz, Rafael | 2040 |
Cuba
|
17 | |
| Ortiz, Teudis Naranjo | 2209 |
Cuba
|
4 | |
| Ortiz, Waldemar | 2139 |
 Puerto Rico
|
45 | |
| Ortiz Aleman, Jose Carlos | 2185 |
Mexico
|
21 | |
| Ortiz Aleman, Nelson | 1771 |
Spain
|
6 | |
| Ortiz Aviles, Javier | 2144 |
Spain
|
14 | |
| Ortiz Cano, Francisco Jose | 1937 |
Spain
|
1 | |
| Ortiz De Latierro Olivella, Aitor | 2013 |
Spain
|
1 | |
| Ortiz Dosal, Alejandra | 1876 |
Mexico
|
9 | |
| Ortiz Fernandez, David | 1974 |
Spain
|
35 | |
| Ortiz Herranz, Eleazar | 2216 |
Spain
|
47 | |
| Ortiz Lafont, Jose | 2165 |
Spain
|
39 | |
| Ortiz Landeira, Jose Antonio | 1817 |
Spain
|
25 | |
| Ortiz Perez, Hector | 1993 |
Spain
|
26 | |
| Ortiz Q, Johnny Alexander | 2065 | FM |
 Guatemala
|
22 |
| Ortiz Roche, Jose | 1900 |
Spain
|
6 | |
| Ortiz Roman, Javier | 1659 |
Spain
|
2 | |
| Ortiz Suarez, Isam | 2522 | IM |
Cuba
|
616 |
| Ortiz Valentin, Jordi | 1953 |
Spain
|
3 | |
| Ortiz Verdezoto, Anahi | 2210 | WIM |
Ecuador
|
37 |
| Ortmann, David | 2271 | FM |
Germany
|
247 |
| Ortner, Ronald | 1879 |
Austria
|
9 | |
| Ortoft, Kai | 1968 |
Norway
|
1 | |
| Ortolland, Jean Pierre | 1840 |
France
|
4 | |
| Orton, Paul | 1749 |
 Wales
|
11 | |
| Orton, William R | 1998 |
United States
|
134 | |
| Ortpaul, Mario | 1954 |
Germany
|
11 | |
| Orts Gonzalez, Rafael | 1468 |
Spain
|
9 | |
| Ortuzar Berrojalbiz, Alfonso | 1834 |
Spain
|
8 | |
| Orujov, Azar | 1999 |
 Azerbaijan
|
8 | |
| Orujov, Elshad | 2304 | FM |
Azerbaijan
|
5 |
| Orujov, Farid | 2258 | FM |
Azerbaijan
|
115 |
| Orujov, Shujaat Ismiali oglu | 2204 |
Azerbaijan
|
27 | |
| Orus, Julien | 1843 |
France
|
10 | |
| Orvisky, Vladimir | 1745 |
Slovakia
|
54 | |
| Orwatsch, Gerhard | 2051 |
Germany
|
223 | |
| Orzech, Dominik | 2248 | IM |
Poland
|
282 |
| Orzechowski, Grzegorz | 1942 |
Poland
|
2 | |
| Orzechowski, Jacek | 2062 |
Poland
|
193 | |
| Orzella, Paolo | 1766 |
Italy
|
9 | |
| Orzhekovsky, Vladimir | 1842 |
Russian Federation
|
8 | |
| Orzikulova, Maftuna | 2005 |
 Uzbekistan
|
7 | |
| Osa Astrain, Ricardo | 1943 |
Spain
|
19 |
@365Chess
Facebook