| Name | ELO | Title | Federation | Games |
| O'Brien, Kieran | 1773 |
 Ireland
|
11 | |
| O'Brien, Richard | 2080 |
Ireland
|
1 | |
| O'Cinneide, Mel | 2117 |
Ireland
|
9 | |
| O'Connell, Gerard | 1995 |
Ireland
|
24 | |
| O'Connell, Kevin J | 2328 | FM |
Ireland
|
9 |
| O'Connor, Jonathan | 2153 |
Ireland
|
9 | |
| O'Connor, Joseph | 2065 |
 United Kingdom
|
7 | |
| O'Donnell, Robert | 1920 |
 United States
|
6 | |
| O'Donnell, Tom | 2332 | IM |
 Canada
|
18 |
| O'Donovan, Richard | 2052 |
Ireland
|
13 | |
| O'Driscoll, Kieran | 2056 |
Ireland
|
46 | |
| O'Grady, Gary | 1932 |
Ireland
|
7 | |
| O'Leary, Matt | 2053 |
Ireland
|
9 | |
| O'Reilly, Edward | 2240 |
Ireland
|
8 | |
| O'Rourke, Ray | 1896 |
Ireland
|
9 | |
| O'Shaughnessy, Conor | 2209 |
Ireland
|
8 | |
| O'Shea, Kevin | 2035 |
Ireland
|
10 | |
| Oancea, Nicolae | 1834 |
Canada
|
20 | |
| Oates, David | 2166 |
 Wales
|
21 | |
| Oatlhotse, Providence | 2219 | IM |
 Botswana
|
129 |
| Obad, Andrija | 2193 | FM |
 Bosnia And Herzegovina
|
20 |
| Obad, Damir | 1999 |
 Croatia
|
6 | |
| Obada, Ema | 1992 | WFM |
 Romania
|
13 |
| Obaid, Sondos | 1454 |
 Bahrain
|
4 | |
| Obando, Arnoldo | 2230 |
 Colombia
|
13 | |
| Obando, Carlos | 1984 |
 Peru
|
12 | |
| Obando, Richard | 2102 |
Peru
|
9 | |
| Obarcanin, Nijaz | 2008 |
Bosnia And Herzegovina
|
23 | |
| Obdrzalkova, Anita | 1978 |
 Slovakia
|
60 | |
| Obels, Jiri | 2042 |
 Netherlands
|
59 | |
| Obels, Pepijn | 1846 |
Netherlands
|
35 | |
| Obenaus, Thomas | 1825 |
 Austria
|
15 | |
| Obeng, Kingsley | 1847 |
 Germany
|
35 | |
| Oberbarnscheidt, Ludger | 2264 |
Germany
|
52 | |
| Oberberger, Guenther | 1843 |
Austria
|
14 | |
| Oberbichler, Robert | 1925 |
Austria
|
8 | |
| Oberdorfer, Christof | 1835 |
Austria
|
9 | |
| Obere, Roman Franz | 1993 |
Germany
|
7 | |
| Oberfrank, Istvan | 2091 |
 Hungary
|
37 | |
| Oberg, Mikael | 2122 |
 Sweden
|
5 | |
| Oberhofer, Andre | 2283 |
Germany
|
73 | |
| Oberhofer, Cedric | 2249 | FM |
Germany
|
52 |
| Oberhofer, Max | 2059 |
Germany
|
108 | |
| Oberhofer, Peter | 1921 |
Germany
|
7 | |
| Oberholzer, Francois | 2056 | FM |
 South Africa
|
1 |
| Oberholzer, Rex | 1941 |
 Namibia
|
38 | |
| Oberlin, Cecile | 1794 |
 France
|
1 | |
| Obermair, Walter | 1924 |
Austria
|
22 | |
| Oberman, Hotimir | 1924 |
Croatia
|
12 | |
| Obermayr, Hermann | 2078 |
Austria
|
160 | |
| Obermeier, Edi | 2067 |
Germany
|
31 | |
| Oberndoerfer, Frank | 1904 |
Germany
|
60 | |
| Oberngruber, Thomas | 2095 |
Austria
|
13 | |
| Obernoeder, Thomas | 1857 |
Germany
|
15 | |
| Oberoi, Shelev | 2253 |
United States
|
198 | |
| Oberpriller, Josef | 1992 |
Germany
|
27 | |
| Oberrauch, Martin | 2185 |
 Italy
|
26 | |
| Obers, Frits | 2100 |
Netherlands
|
138 | |
| Obersnel, Jan | 1833 |
 Slovenia
|
9 | |
| Oberst, Janosch | 1914 |
Germany
|
7 | |
| Oberst, Thomas | 2227 | FM |
Germany
|
154 |
| Oberste, Norbert | 1851 |
Germany
|
83 | |
| Obert, Julien | 1976 |
France
|
1 | |
| Oberweis, Paul | 1970 |
 Luxembourg
|
32 | |
| Obgolts, Erik | 2411 | IM |
 Russian Federation
|
184 |
| Obiamiwe, Paul | 1881 |
 Nigeria
|
91 | |
| Obiedzinski, Pawel | 1879 |
 Poland
|
9 | |
| Obiedzinski, Piotr | 1896 |
Poland
|
5 | |
| Obierak, Wladyslaw | 2089 |
Poland
|
40 | |
| Obili, Abhishek | 2031 |
United States
|
5 | |
| Objois, Pierre Henri | 1832 |
France
|
4 | |
| Oblak, Marko | 1636 |
Italy
|
9 | |
| Oblamski, Vladimir | 2008 |
 Belarus
|
23 | |
| Oblin, Pierre | 1807 |
France
|
1 | |
| Oblitas, Carlomagno | 2382 | IM |
Peru
|
333 |
| Obodchuk, Andrei | 2233 | IM |
 Fide
|
399 |
| Oboladze, Luka | 2405 | IM |
 Georgia
|
82 |
| Obolenskikh, Dmitry | 2537 | IM |
Russian Federation
|
100 |
| Obolentseva, Alexandra | 2323 | WGM |
Russian Federation
|
110 |
| Obolonin, Filipp | 2039 |
 Estonia
|
3 | |
| Obon Temprano, Sergi | 2182 | FM |
 Spain
|
72 |
| Obon Zuniga, Francisco | 1819 |
Spain
|
19 | |
| Obona, Jan | 2095 |
Slovakia
|
72 | |
| Obondo, Cynthia Awino | 1687 |
 Kenya
|
9 | |
| Oborina, Elena | 2030 |
Russian Federation
|
11 | |
| Oborny, Lubor | 1944 |
 Czech Republic
|
3 | |
| Oboron, Georges | 2005 |
Poland
|
13 | |
| Oborski, Artur | 1942 |
Poland
|
8 | |
| Obradovic, Alexandar | 2225 |
 Serbia
|
1 | |
| Obradovic, Blazimir | 2139 | FM |
Serbia
|
4 |
| Obradovic, Dragan | 1934 |
Serbia
|
36 | |
| Obradovic, Milan | 1664 |
 Switzerland
|
5 | |
| Obradovic, Momcilo | 1905 |
Serbia
|
3 | |
| Obradovic, Vasilije | 1976 |
Serbia
|
12 | |
| Obralic, Esad | 2331 | FM |
Bosnia And Herzegovina
|
13 |
| Obran, Harald | 2000 |
Austria
|
80 | |
| Obregon, Andres Carlos | 2506 | GM |
 Argentina
|
251 |
| Obregon Garcia, Roxangel | 2156 | WIM |
 Cuba
|
49 |
| Obregon Rivero, Juan | 2391 | FM |
Cuba
|
188 |
| Obreht, Slobodan | 1980 |
Germany
|
23 | |
| Obreja, Mihai | 1816 |
Romania
|
13 | |
| Obrezchikov, Mikhail | 1907 |
Russian Federation
|
10 | |
| Obrien, Matthew | 2139 |
United States
|
5 | |
| Obringer, Jean Marc | 1954 |
France
|
24 | |
| Obrochta, Bogdan | 2073 |
Poland
|
19 | |
| Obrovac, Zvonko | 2153 |
Canada
|
7 | |
| Obrsal, Josef | 1701 |
Czech Republic
|
41 | |
| Obrusnik, Dawid | 1849 |
Poland
|
9 | |
| Obrusnik, Michal | 2246 | FM |
Poland
|
48 |
| Obrusnik, Pawel | 1759 |
Poland
|
8 | |
| Obsivac, Josef | 2280 | FM |
Czech Republic
|
474 |
| Obst, James | 2097 |
 Australia
|
92 | |
| Obst, Martin | 2021 |
Germany
|
28 | |
| Obuca, Bajro | 2047 | CM |
Bosnia And Herzegovina
|
26 |
| Obukhov, Alexander | 2330 | GM |
Russian Federation
|
533 |
| Obukhov, Sergeij | 2078 |
 Ukraine
|
11 | |
| Oburka, Vladislav | 1831 |
Czech Republic
|
8 | |
| Ocabo Vera, Pedro Aristides | 1687 |
Spain
|
9 | |
| Ocakacan, Deniz | 1883 |
 Turkey
|
9 | |
| Ocampo, Cristina | 2026 | WFM |
Colombia
|
8 |
| Ocampo, Fermin | 1972 |
Argentina
|
1 | |
| Ocampo, Gisel | 1685 |
Argentina
|
5 | |
| Ocampo, Raul | 2315 |
Argentina
|
63 | |
| Ocampo Vargas, Raul | 2009 | IM |
 Mexico
|
124 |
| Ocampos, Ian | 2223 |
Argentina
|
27 | |
| Ocampos, Martin | 1703 |
 Paraguay
|
2 | |
| Ocana Lameiro, Oliver | 1993 |
Spain
|
2 | |
| Ocana Roca, Juan Jesus | 2145 |
Spain
|
33 | |
| Ocantos, Manuel | 2145 |
Luxembourg
|
122 | |
| Ocariz Gallego, Francisco Javier | 1774 |
Spain
|
9 | |
| Ocariz Gallego, Jesus | 1974 |
Spain
|
25 | |
| Occari, Maurizio | 1999 |
Italy
|
22 | |
| Occhipinti, Giuseppe | 1943 |
Italy
|
1 | |
| Occhipinti, Massimo | 1913 |
Italy
|
22 | |
| Ocejo, Leyla | 2061 |
Cuba
|
8 | |
| Ocelak, Jakub | 2192 | CM |
Czech Republic
|
61 |
| Ocelik, Vaclav | 1894 |
Netherlands
|
9 | |
| Ocepek, Martin | 2099 |
Slovenia
|
16 | |
| Ochedzan, Tymon | 2206 | FM |
Poland
|
114 |
| Ochelli, Francisco | 1852 |
Paraguay
|
24 | |
| Ochirbat, Lkhagvajamts | 2211 | CM |
 Mongolia
|
8 |
| Ochirova, Irina | 1692 |
Russian Federation
|
10 | |
| Ochkoos, Jura | 2181 | FM |
Canada
|
235 |
| Ochkov, Radoslav | 1935 |
 Bulgaria
|
32 | |
| Ochman, Tomas | 1872 |
Czech Republic
|
21 | |
| Ochmann, Denis | 1691 |
Germany
|
7 | |
| Ochmann, Reimund | 1921 |
Germany
|
49 | |
| Ochneva, Inga | 2114 | WFM |
Russian Federation
|
8 |
| Ochoa, Carl Victor | 2276 |
 Philippines
|
35 | |
| Ochoa, Ismael | 1914 |
 Honduras
|
5 |
| Name | ELO | Title | Federation | Games |
| Ochoa, Jason | 1872 |
United States
|
5 | |
| Ochoa, Matias | 1977 |
Argentina
|
25 | |
| Ochoa de la Rosa, Manuel Dario | 2387 | FM |
Cuba
|
58 |
| Ochodek, Mariusz | 1991 |
Poland
|
9 | |
| Ochonski, Piotr | 2160 |
Poland
|
36 | |
| Ochrana, Ladislav | 1931 |
Slovakia
|
46 | |
| Ochs, Daniel Elias | 2224 | FM |
Germany
|
39 |
| Ochs, Holger | 2225 |
Germany
|
63 | |
| Ochs, Thomas | 1542 |
Germany
|
6 | |
| Ochsner, Bjorn Moller | 2515 | GM |
 Denmark
|
341 |
| Ochsner, Henrik | 1932 |
Denmark
|
2 | |
| Ochsner, Thomas | 2257 |
Denmark
|
349 | |
| Ochtman, Henk | 2062 |
Netherlands
|
27 | |
| Ociepka, Dominika | 1645 |
Poland
|
1 | |
| Ockay, Tomas | 2063 |
Czech Republic
|
58 | |
| Ockenfels, Karsten | 1782 |
Germany
|
7 | |
| Ocko, Martin | 2050 |
Slovakia
|
1 | |
| Ocnarescu, Victor | 2164 |
Romania
|
81 | |
| Ocokoljic, Zoran | 1931 |
Serbia
|
19 | |
| Ocon Galilea, Francisco Jose | 1969 |
Spain
|
23 | |
| Ocon Herce, Emilio | 1952 |
Spain
|
5 | |
| Oconnor, Derek | 2280 |
United States
|
13 | |
| Ocwieja, Piotr | 1822 |
Poland
|
4 | |
| Ocytko, Andrzej | 1995 |
Poland
|
95 | |
| Ocytko, Anna | 1980 |
Poland
|
19 | |
| Ocytko, Michal | 1474 |
Poland
|
9 | |
| Odachowski, Arthur | 2205 |
Canada
|
64 | |
| Odadzic, Zoran | 1823 |
Serbia
|
4 | |
| Odde, Eilif | 1928 |
 Norway
|
40 | |
| Odden, Jan Ove | 1723 |
Norway
|
27 | |
| Oddone, Cristhian | 2247 |
 Uruguay
|
28 | |
| Odeev, Handszar | 2245 | GM |
 Turkmenistan
|
519 |
| Odeeva, Larisa | 2198 | WFM |
Turkmenistan
|
14 |
| Odegaard, Per Chr | 1810 |
Norway
|
2 | |
| Odegov, Artem | 2261 | FM |
Russian Federation
|
65 |
| Odeh, Kenneth | 1959 | FM |
Nigeria
|
50 |
| Odehnal, Jaroslav | 1918 |
Czech Republic
|
13 | |
| Odehnal, Miroslav | 2226 |
Czech Republic
|
22 | |
| Oden, Edgar | 2008 |
Germany
|
22 | |
| Odendaal, Frederick | 1999 |
South Africa
|
35 | |
| Odendahl, Reiner | 2273 | FM |
Germany
|
338 |
| Odendahl, Steven M | 2420 | IM |
United States
|
95 |
| Odermatt, Klaus | 1869 |
Switzerland
|
14 | |
| Odermatt, Stefan | 2132 |
Switzerland
|
6 | |
| Odesskij, Ilia | 2429 | IM |
Russian Federation
|
125 |
| Odinaev, Timur | 2302 | FM |
Russian Federation
|
9 |
| Odinaeva, Saodat | 1936 |
 Tajikistan
|
20 | |
| Odink, Karel | 2116 |
Netherlands
|
10 | |
| Odinokov, Nikolai | 2312 | FM |
Russian Federation
|
82 |
| Odisharia, Teona | 2178 |
Georgia
|
78 | |
| Odler, Daniel | 2034 |
Slovakia
|
84 | |
| Odnorozhenko, Evgenyi | 2159 | IM |
Ukraine
|
132 |
| Odnorozhenko, Kateryna | 2084 | WIM |
Ukraine
|
148 |
| Odor, Istvan | 2095 |
Hungary
|
1 | |
| Odounga Christ, Ceylan | 1632 |
 Gabon
|
11 | |
| Odunaiya, Victor | 1833 |
United Kingdom
|
4 | |
| Odzak, Senad | 1900 |
Bosnia And Herzegovina
|
2 | |
| Oe, Oluf | 1809 |
Denmark
|
24 | |
| Oechler, Hans Erich | 2121 |
Germany
|
24 | |
| Oechslein, Rainer | 2097 |
Germany
|
228 | |
| Oehler, Markus | 2063 |
Germany
|
35 | |
| Oehlerich, Per | 1949 |
Denmark
|
22 | |
| Oehlmann, Dieter | 2041 |
Germany
|
48 | |
| Oehmichen, Jan | 1918 |
Denmark
|
24 | |
| Oehne, Ingo | 1882 |
Germany
|
7 | |
| Oehne, Timo | 2152 |
Germany
|
11 | |
| Oehrlein, Alexander | 2125 |
Germany
|
29 | |
| Oehrlein, Thomas | 2235 |
Germany
|
91 | |
| Oei, Hway Ik | 2071 |
Netherlands
|
195 | |
| Oelert, Ralf | 1989 |
Germany
|
50 | |
| Oellrich, Torben | 1799 |
Germany
|
15 | |
| Oelrichs, Manfred | 1800 |
Germany
|
155 | |
| Oelze, Joern | 1983 |
Germany
|
48 | |
| Oendy, Oscar | 2081 |
Australia
|
30 | |
| Oepen, Lothar | 2064 |
Germany
|
79 | |
| Oergel, Ullrich | 1972 |
Germany
|
14 | |
| Oertel, David | 1987 |
Germany
|
27 | |
| Oertel, Thomas | 1999 |
Germany
|
29 | |
| Oesch, Harry | 1943 |
Switzerland
|
5 | |
| Oest, Thorsten | 1964 |
Germany
|
36 | |
| Oesterle, Peter | 2385 |
Germany
|
79 | |
| Oesterreicher, Moritz | 1882 |
Austria
|
6 | |
| Oettel, Andreas | 2244 |
Germany
|
32 | |
| Oettel, Lothar | 1922 |
Germany
|
25 | |
| Oettinger, Hagen | 2111 |
Germany
|
72 | |
| Oetzel, Roland | 2270 |
Germany
|
23 | |
| Oez, Edda | 1517 |
Germany
|
60 | |
| Oezen, Alf | 1932 |
Germany
|
13 | |
| Ofak, Marko | 2029 |
Slovenia
|
11 | |
| Ofek, Ram | 2136 |
 Israel
|
43 | |
| Offergeld, Martin | 1684 |
Germany
|
10 | |
| Offermann, Fernando | 2085 | CM |
Germany
|
40 |
| Officer, Amy | 1895 | WFM |
Scotland
|
71 |
| Offinger, Robert | 2181 |
Germany
|
97 | |
| Offringa, Joost | 2271 |
Netherlands
|
52 | |
| Offringa, Tjaart Jan | 2070 |
Netherlands
|
57 | |
| Ofir, Eran | 2112 |
Israel
|
2 | |
| Ofitserian, Boris | 2362 | IM |
Russian Federation
|
129 |
| Ofner, Maximilian | 2154 |
Austria
|
19 | |
| Ofowino, Toritsemuwa | 1927 |
Nigeria
|
9 | |
| Ofstad, Per | 1959 |
Norway
|
369 | |
| Ofstad, Sigurd | 2012 |
Norway
|
2 | |
| Ogaard, Leif | 2358 | GM |
Norway
|
594 |
| Ogada Osir, Ibrahim | 2059 | CM |
Australia
|
18 |
| Ogando Gonzalez, Francisco J | 1977 |
Spain
|
4 | |
| Oganessian, Gaguik | 2002 | FM |
 Armenia
|
2 |
| Oganessiats, Ernest | 2260 |
Armenia
|
11 | |
| Oganezova, Tamila | 2057 |
Russian Federation
|
46 | |
| Oganian, Arsen | 2228 |
Russian Federation
|
11 | |
| Oganian, Miran | 2434 | IM |
Russian Federation
|
369 |
| Oganian, Roman | 2215 |
Russian Federation
|
12 | |
| Oganisjn, Roman | 2275 |
Russian Federation
|
107 | |
| Oganyan, Arsen | 2213 |
Russian Federation
|
24 | |
| Ogbiyoyo, Perpetual Eloho | 1954 | WFM |
Nigeria
|
18 |
| Ogden, Marcus W | 1826 |
Australia
|
3 | |
| Ogdon, Ricardo | 1767 |
Paraguay
|
25 | |
| Oger, Claude | 1963 |
France
|
85 | |
| Oger, Daniel | 1885 |
 Belgium
|
21 | |
| Oger, Philippe | 1869 |
France
|
1 | |
| Oges, Helene | 1699 |
France
|
28 | |
| Oggier, Cesar | 2225 |
Argentina
|
13 | |
| Ogiewka, Rafal | 2065 |
Poland
|
11 | |
| Oginski, Ulrich | 1892 |
Germany
|
9 | |
| Oglaza, Oskar | 2304 | FM |
Poland
|
95 |
| Ogleznev, Alexandr | 2301 | FM |
 Moldova
|
161 |
| Oglobilia, Alexander | 2242 |
Ukraine
|
65 | |
| Ogloblin, Nikolay | 2346 | IM |
Russian Federation
|
151 |
| Ogloblina, Lidiya | 2146 |
Russian Federation
|
9 | |
| Ognean, Mihnea-Ionut | 2383 | FM |
Romania
|
94 |
| Ognerubova, Anastasia | 2052 | WFM |
Russian Federation
|
17 |
| Ognibene, Piero | 1862 |
Italy
|
2 | |
| Ognjacevic, Alen | 1970 |
Croatia
|
20 | |
| Ognjan, Renato | 1992 |
Croatia
|
8 | |
| Ogonowska, Katarzyna | 1896 |
Poland
|
77 | |
| Ogorodov, Petr | 1890 |
Russian Federation
|
15 | |
| Ograbek, Grzegorz | 2058 | CM |
Poland
|
19 |
| Ogradi, Gregor | 1972 |
Slovenia
|
16 | |
| Ogunmefun, Adekunle | 2041 |
United States
|
32 | |
| Ogunremi, Adenike | 1725 |
Nigeria
|
10 | |
| Ogunshola, Ben | 2042 |
Nigeria
|
39 | |
| Ogunwobi, Tolulope | 2020 |
Nigeria
|
6 | |
| Oguz, Huseyin | 1852 |
Turkey
|
6 | |
| Oguzov, Shamil | 2178 |
Russian Federation
|
9 | |
| Ohanyan, Emin | 2488 | GM |
Armenia
|
283 |
| Oharek, Vlastimil | 1815 |
Czech Republic
|
2 | |
| Ohat, Imre | 1965 |
Hungary
|
2 | |
| Ohayv, Nikolaj | 1949 |
Denmark
|
8 | |
| Ohl, Christophe | 2107 |
France
|
15 | |
| Ohler, Julius | 2223 | FM |
Germany
|
29 |
| Ohlund, Nicolas | 1983 |
France
|
8 |
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