| Name | ELO | Title | Federation | Games |
| Olsson, Anders | 2400 | IM |
 Sweden
|
247 |
| Olsson, Conny | 2112 |
Sweden
|
16 | |
| Olsson, Dick | 1714 |
Sweden
|
14 | |
| Olsson, Fredric | 1986 |
Sweden
|
13 | |
| Olsson, Gary | 1958 |
Sweden
|
12 | |
| Olsson, Greta | 2033 |
 United States
|
19 | |
| Olsson, Gustaf | 1752 |
Sweden
|
4 | |
| Olsson, Jonas | 2152 |
Sweden
|
6 | |
| Olsson, Jorgen | 1886 |
Sweden
|
4 | |
| Olsson, Kent | 2185 |
Sweden
|
14 | |
| Olsson, Krister | 2346 |
Sweden
|
152 | |
| Olsson, Lars | 2056 |
Sweden
|
14 | |
| Olsson, Linn | 1785 |
Sweden
|
11 | |
| Olsson, Linus | 2204 | FM |
Sweden
|
272 |
| Olsson, Per | 2060 |
Sweden
|
15 | |
| Olsson, Simon | 2042 |
Sweden
|
13 | |
| Olsson, Tomas | 2003 |
Sweden
|
113 | |
| Olsson, William | 2366 | FM |
Sweden
|
81 |
| Olszewski, Andrzej | 2181 |
 Poland
|
3 | |
| Olszewski, Jerzy | 1555 |
Poland
|
9 | |
| Olszewski, Marek | 1601 |
Poland
|
132 | |
| Olszewski, Michal | 2514 | GM |
Poland
|
503 |
| Olszewski, Piotr | 1501 |
Poland
|
48 | |
| Olszynski, Kazimierz | 2151 |
Poland
|
18 | |
| Olszynski, Michal | 1977 |
Poland
|
1 | |
| Olte, George | 2183 |
United States
|
4 | |
| Oltean, Dorel | 2339 | IM |
 Romania
|
34 |
| Oltean, Gusztav | 1984 |
 Hungary
|
36 | |
| Oltean, Liviu Ioan | 2293 | FM |
Romania
|
13 |
| Olteanu, Florentin | 2010 |
Romania
|
5 | |
| Olteanu, Gabriela | 2010 | WFM |
Romania
|
13 |
| Oltion, Vata | 2127 |
 Albania
|
1 | |
| Oltmanns, Ingmar | 1973 |
 Germany
|
45 | |
| Oltra, Alexandre | 1887 |
 France
|
7 | |
| Oltra Artal, Ferran | 1635 |
 Spain
|
1 | |
| Oltra Caurin, Ramon | 2350 | IM |
Spain
|
158 |
| Oltra Landete, Fidel | 1899 |
Spain
|
15 | |
| Oluc, Hakan | 1951 |
 Turkey
|
10 | |
| Oluka Robert Mcligeyo | 2066 |
 Kenya
|
12 | |
| Olund, Joar | 2035 |
Sweden
|
93 | |
| Olund, Joar | 2366 | FM |
Sweden
|
9 |
| Olyschlaeger, Richard | 2011 |
Germany
|
72 | |
| Olzem, Lothar | 2153 |
Germany
|
202 | |
| Om, Kharola | 2314 | FM |
 India
|
40 |
| Omahen, Gasper | 1936 |
 Slovenia
|
1 | |
| Omanovic, Vahidin | 1984 |
 Bosnia And Herzegovina
|
9 | |
| Omar, Abdulwahab | 2025 |
 United Arab Emirates
|
9 | |
| Omar, Asrul Sharaff | 1914 |
 Malaysia
|
10 | |
| Omar, Hytham | 2185 | 53 | ||
| Omar, Noaman | 2350 | IM |
United Arab Emirates
|
254 |
| Omar Aden Omar | 1544 |
 Djibouti
|
10 | |
| Omariev, Maksim | 2304 | FM |
 Russian Federation
|
40 |
| Omarsson, Dadi | 2193 |
 Iceland
|
57 | |
| Omasta, Dusan | 1864 |
 Czech Republic
|
21 | |
| Omearat, Adel | 2226 | FM |
 Syrian Arab Republic
|
93 |
| Omelchenko, Lev | 2176 |
Russian Federation
|
13 | |
| Omelchenko, Vladimir | 2269 |
Russian Federation
|
2 | |
| Omelja, Artem | 2444 | GM |
 Ukraine
|
213 |
| Omelka, Antonin | 1891 |
Czech Republic
|
33 | |
| Omelka, Marek | 2108 |
Czech Republic
|
75 | |
| Omelka, Roman | 1978 |
Czech Republic
|
20 | |
| Omelyanchuk, Viktor | 1994 |
Russian Federation
|
24 | |
| Omer, Khan | 1755 |
 Pakistan
|
9 | |
| Omercic, Adnan | 2128 |
Bosnia And Herzegovina
|
20 | |
| Omercic, Muhamed | 2078 |
Bosnia And Herzegovina
|
9 | |
| Omeri, Eklea | 1956 |
Albania
|
2 | |
| Omeri, Silvan | 2229 |
 Italy
|
31 | |
| Omidi, Arya | 2294 |
 Iran
|
116 | |
| Omland, Harald | 1709 |
 Norway
|
2 | |
| Ommer, Walter | 2051 |
Germany
|
33 | |
| Omoifo, Osemekhian I | 2185 |
United States
|
19 | |
| Omonov, Asrorjon | 2406 | FM |
 Uzbekistan
|
60 |
| Omonova, Umida | 2081 | WIM |
Uzbekistan
|
76 |
| Omoragbon, Doris | 1810 |
 Nigeria
|
19 | |
| Omorere, Benjamin | 2183 | CM |
Nigeria
|
9 |
| Omorjan, Dejan | 2319 | FM |
 Serbia
|
211 |
| Omota, Vlad | 1945 |
 Netherlands
|
2 | |
| Omrani, Hasan | 2113 |
Syrian Arab Republic
|
11 | |
| Oms, Mirella | 1611 |
France
|
1 | |
| Oms Fuentes, Lluis | 2295 | FM |
Spain
|
216 |
| Oms Pallisse, Josep | 2432 | GM |
Spain
|
706 |
| Omtvedt, Aleksander | 1935 |
Norway
|
29 | |
| Omtvedt, Per | 1832 |
Norway
|
72 | |
| Omurbekova, Diana | 1809 |
 Kyrgyzstan
|
21 | |
| Omutnykh, Natalia | 2110 |
Ukraine
|
13 | |
| Onabogun, Kolade | 2184 |
Nigeria
|
37 | |
| Onasch, Gunnar | 1980 |
Germany
|
95 | |
| Onasch, Paul | 2004 |
Germany
|
61 | |
| Onat, Ilhan | 2334 | IM |
Turkey
|
136 |
| Onate Gomez, Ildefonso | 1867 |
Spain
|
2 | |
| Onate Mendez, Elias | 2207 |
Spain
|
18 | |
| Onatzky, Serge | 1753 |
France
|
1 | |
| Onay, Emrah | 1879 |
Turkey
|
4 | |
| Oncel, Ilie | 1997 |
Romania
|
39 | |
| Ondangan, Ruben | 2118 |
United States
|
2 | |
| Ondangan Jr, Ruben G | 2106 |
United States
|
3 | |
| Ondas, Miroslav | 1737 |
 Slovakia
|
1 | |
| Ondercin, Martin | 1987 |
Slovakia
|
8 | |
| Onderek, David | 2201 |
Czech Republic
|
47 | |
| Ondersteijn, Niels | 2363 | IM |
Netherlands
|
276 |
| Ondo, Lubomir | 2027 |
Slovakia
|
16 | |
| Ondo, Radoslav | 1997 |
Slovakia
|
19 | |
| Ondok, Laszlo | 2241 |
Hungary
|
128 | |
| Ondozi, Murtez | 2378 | FM | 41 | |
| Ondras, Michal | 1886 |
Slovakia
|
2 | |
| Ondrej, Tomas | 1890 |
Czech Republic
|
2 | |
| Ondrejat, Miroslav | 1954 |
Czech Republic
|
132 | |
| Ondrova, Michaela | 1958 |
Czech Republic
|
25 | |
| Ondrus, Martin | 2189 | FM |
Slovakia
|
44 |
| Ondul, Aydin | 2006 |
 Canada
|
11 | |
| Oneldis, Santiago | 2121 |
 Cuba
|
1 | |
| Oner, Ekin | 1752 |
Turkey
|
6 | |
| Onesti, Luca | 1908 |
Italy
|
5 | |
| Oneto Zarco, Jose | 1957 |
Spain
|
57 | |
| Oney, Fatmanur | 1702 |
Turkey
|
128 | |
| Oney, Feridun | 2014 | FM |
Turkey
|
202 |
| Oney, Gulumser | 1644 |
Turkey
|
20 | |
| Oney, Remel | 1869 |
Turkey
|
17 | |
| Oney, Riza | 1771 |
Turkey
|
12 | |
| Onez, Cemal | 1807 |
Turkey
|
12 | |
| Ong, Alvin | 2231 |
 Singapore
|
9 | |
| Ong, Kevin | 1996 |
Sweden
|
59 | |
| Ong, Kezli | 2277 |
Sweden
|
239 | |
| Ong, Wah-Peng John | 1765 | 11 | ||
| Ongarelli, Marco | 1982 |
Italy
|
5 | |
| Ongut, Tamas Gunes | 2318 | FM |
Hungary
|
259 |
| Onhor, Bold | 1938 |
Germany
|
9 | |
| Onischenko, Andrey | 1990 |
Russian Federation
|
2 | |
| Onischenko, Leonid | 1898 |
Russian Federation
|
5 | |
| Onischuk, Alexander | 2640 | GM |
United States
|
1488 |
| Onischuk, Jana | 2057 |
Ukraine
|
9 | |
| Onischuk, Nastja | 2129 | WFM |
Ukraine
|
44 |
| Onkoud, Abdelaziz | 2313 | IM |
 Morocco
|
290 |
| Onna Amargant, Josep | 1924 |
 Andorra
|
1 | |
| Onocko, Gabriel | 1998 |
 Argentina
|
45 | |
| Onocko, Luciano | 1794 |
Argentina
|
16 | |
| Onocko, Pablo | 1899 |
Argentina
|
13 | |
| Onodi, Miklos | 2026 |
Hungary
|
5 | |
| Onodi, Tamas | 2015 |
Hungary
|
3 | |
| Onoja, Iyefu Joy | 1947 |
Nigeria
|
8 | |
| Onoprienko, Elena | 1836 |
Russian Federation
|
9 | |
| Onoprienko, Konstantin | 2269 |
Russian Federation
|
50 | |
| Onoprienko, Vladimir | 2282 | IM |
Russian Federation
|
370 |
| Onoprijchuk, Boris | 2385 | IM |
Russian Federation
|
20 |
| Onrust, Benny | 2025 |
Netherlands
|
6 | |
| Onsari, Leandro | 2003 |
Argentina
|
3 | |
| Onslow, Alfie | 2166 |
 United Kingdom
|
39 | |
| Onstad, Lars | 1873 |
Norway
|
4 | |
| Ontanon Gomez, Jesus | 1987 |
Spain
|
1 | |
| Ontanon Gomez, Pablo | 2119 |
Spain
|
12 |
| Name | ELO | Title | Federation | Games |
| Ontiveros, John | 1837 |
Iceland
|
9 | |
| Ontiveros Lopez, Francisco | 1661 |
Spain
|
1 | |
| Onur, Cigdem | 1935 | WCM |
Turkey
|
39 |
| Onut, Simeon | 1983 |
Romania
|
14 | |
| Onyekwere, Chikwere | 2201 | CM |
Nigeria
|
19 |
| Onyshchuk, Volodymyr | 2619 | GM |
Ukraine
|
1094 |
| Ooft, Tesora | 1846 | WCM |
 Suriname
|
16 |
| Ooi, Kyo | 1990 |
 Australia
|
1 | |
| Ooi, Zhi Yang | 2059 | IM |
Malaysia
|
5 |
| Oomen, Rens | 2070 |
Netherlands
|
1 | |
| Ooms, Andy | 2257 |
 Belgium
|
170 | |
| Oosterman, Maarten Jan | 1992 |
Netherlands
|
23 | |
| Oosterom, Erik | 2084 |
Netherlands
|
144 | |
| Oosthout, Wouter | 1970 |
Netherlands
|
1 | |
| Oosthuizen, Linda | 1977 |
 South Africa
|
10 | |
| Oosting, Robert | 1941 |
Netherlands
|
1 | |
| Ootes, Lars | 2383 | IM |
Netherlands
|
268 |
| Ootes, Lennart | 2115 |
Netherlands
|
69 | |
| Op den Dries, Johan | 2118 |
Netherlands
|
2 | |
| Op den Kelder, Joram | 2284 |
Netherlands
|
81 | |
| Opacak, Ivan | 1877 |
 Croatia
|
4 | |
| Opacak, Mato | 1924 |
Croatia
|
1 | |
| Opalic, Momcilo | 2140 |
Germany
|
80 | |
| Opalinska, Marta | 1923 |
Poland
|
19 | |
| Opalinski, Krzysztof | 1855 |
Poland
|
6 | |
| Opalinski, Patryk | 1868 |
Poland
|
15 | |
| Opalinski, Sebastian | 1888 |
Poland
|
38 | |
| Opalka, Guido | 2199 |
Germany
|
151 | |
| Opalka, Joachim | 2193 |
 Chile
|
9 | |
| Opara, Jan | 2072 |
Slovenia
|
18 | |
| Oparaugo, Thomas | 2026 | IM |
Nigeria
|
174 |
| Oparin, Grigoriy | 2670 | GM |
United States
|
1110 |
| Opasiak, Dustin Tennessee | 1758 |
Poland
|
31 | |
| Opaska, Ines | 1918 |
Germany
|
130 | |
| Opaska, Michael P | 1948 |
United States
|
12 | |
| Opava, Axel | 2031 |
Germany
|
4 | |
| Opdebeek, Fabien | 1710 |
Belgium
|
9 | |
| Ophoff, Rigobert | 1938 |
Germany
|
131 | |
| Opic, Ivan | 1928 |
Croatia
|
13 | |
| Opietnik, Christoph | 2039 |
 Austria
|
8 | |
| Opinca, Sorin | 2145 |
 Moldova
|
31 | |
| Opio, Steven | 2161 |
 Uganda
|
28 | |
| Opitz, Alexander | 2311 |
Germany
|
44 | |
| Opitz, Christian | 1964 |
Germany
|
1 | |
| Opitz, Claudio | 2155 |
Germany
|
69 | |
| Opitz, Frank | 1905 |
Germany
|
95 | |
| Opl, Klaus | 1883 |
Austria
|
311 | |
| Opocensky, Miroslav | 1948 |
Czech Republic
|
20 | |
| Opolski, Wojciech | 1674 |
Poland
|
19 | |
| Oppermann, Peter | 1872 |
Germany
|
2 | |
| 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 |
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