| Name | ELO | Title | Federation | Games |
| Olarasu, Gabriela | 2256 | WGM |
 Romania
|
689 |
| Olarasu, Ioana | 1861 |
Romania
|
12 | |
| Olarasu, Iuliana | 2014 |
Romania
|
5 | |
| Olariu, Luca-Stefan | 2112 |
Romania
|
8 | |
| Olaru, Daniel | 2081 |
 France
|
4 | |
| Olatunji, Oluwatobiloba | 1918 | WFM |
 Nigeria
|
11 |
| Olausson, Claes Goran | 2219 |
 Sweden
|
87 | |
| Olave Parra, Hugo | 1835 |
 Chile
|
17 | |
| Olay, Edgar Reggie | 2184 |
 Philippines
|
40 | |
| Olay Valdes, Rodrigo | 1883 |
 Spain
|
94 | |
| Olaya, Noemi | 1550 |
 Ecuador
|
8 | |
| Olaya, Sandra | 1669 |
Ecuador
|
7 | |
| Olazagoitia Rodriguez, Jose Luis | 2197 |
Spain
|
18 | |
| Olazarri, Marcelo | 2208 |
 Uruguay
|
86 | |
| Olbrich, Jakob | 1968 |
 Germany
|
7 | |
| Olbrich, Joachim | 2039 | FM |
Germany
|
114 |
| Olbrich, Marina | 2330 | WIM |
Germany
|
305 |
| Olbrich, Peter | 1878 |
Germany
|
15 | |
| Olbrig, Michael | 1912 |
Germany
|
18 | |
| Olbrisch, Manfred | 2108 |
Germany
|
61 | |
| Olcayoz, Alper | 2134 | FM |
 Turkey
|
227 |
| Olcum, Ahmet | 2211 | FM |
Turkey
|
52 |
| Old, Stefan | 1716 |
Germany
|
5 | |
| Oldach, Ehrenfried | 2021 |
Germany
|
163 | |
| Olde, Grete | 1945 | WCM |
 Estonia
|
5 |
| Olde, Hendrik | 2302 | FM |
Estonia
|
69 |
| Olde, Henning | 1878 |
Germany
|
9 | |
| Olde, Margareth | 2146 | WIM |
Estonia
|
79 |
| Oldenhuis, Lance | 1990 |
 Netherlands
|
48 | |
| Oldernes, Lars Arne | 1811 |
 Norway
|
44 | |
| Oldigs, Adolf | 1792 |
Germany
|
21 | |
| Olea Perez, Mario | 2263 | FM |
Spain
|
289 |
| Olear, Laszlo | 2071 |
 Hungary
|
35 | |
| Olebile, Thato | 1983 | FM |
 Botswana
|
10 |
| Olechnicka, Karolina | 1963 |
 Poland
|
1 | |
| Oledzki, Adam | 1881 |
Poland
|
20 | |
| Oledzki, Tomasz | 2030 |
Poland
|
23 | |
| Oleinik, Alexander | 2111 |
 Russian Federation
|
10 | |
| Oleinik, Petr | 1854 |
Russian Federation
|
1 | |
| Oleinikov, Dmitrij | 2235 |
Russian Federation
|
10 | |
| Olejarczyk, Bogdan | 2052 |
Poland
|
68 | |
| Olejnicek, Jiri | 2005 |
 Czech Republic
|
25 | |
| Olejniczak, Romuald | 1761 |
Poland
|
6 | |
| Olejnik, Bernard | 1761 |
Poland
|
1 | |
| Oleksiyenko, Mykhaylo | 2573 | GM |
 Ukraine
|
839 |
| Oleksy, Krzysztof | 1835 |
Poland
|
4 | |
| Olenderek, Tomasz | 2050 |
Poland
|
53 | |
| Oleneva, Svetlana | 2086 | WFM |
Russian Federation
|
57 |
| Oleniak, Wlodzimierz | 1892 |
Ukraine
|
8 | |
| Olenichev, Dmitriy | 2301 | FM |
Ukraine
|
36 |
| Olenik Campa, Rudi | 2301 | FM |
 Slovenia
|
37 |
| Olenin, Nikolay | 2306 | IM |
Russian Federation
|
214 |
| Olenina, Aysa | 2055 |
Russian Federation
|
3 | |
| Olesen, Bent | 1981 |
 Denmark
|
6 | |
| Olesen, Martin | 2304 | IM |
Denmark
|
381 |
| Olesen, Michael | 2011 |
Denmark
|
7 | |
| Olesen, Michael Jacob | 1952 |
Denmark
|
21 | |
| Olesen, Poul Erik Norgaard | 1983 |
Denmark
|
24 | |
| Olesen, Tommy Svane | 2009 |
Denmark
|
2 | |
| Olesiak, Marcin | 2017 |
Poland
|
7 | |
| Olesnan, Ervin | 1693 |
Czech Republic
|
1 | |
| Oleszczuk, Maciej | 1770 |
Poland
|
9 | |
| Oleynik, Alexander | 2249 |
Ukraine
|
1 | |
| Olf, Hans Helmut | 2001 |
Germany
|
92 | |
| Olguin, Adolfo | 1608 |
 Argentina
|
16 | |
| Olguin, Monica | 1737 |
France
|
19 | |
| Olhovaja, Elena | 2125 |
Russian Federation
|
12 | |
| Olhovik, Andrei | 2283 | FM |
 Fide
|
19 |
| Oliana Rectoret, Pere | 1751 |
Spain
|
1 | |
| Olias Munoz, Francisco | 1812 |
Spain
|
10 | |
| Olic, Branko | 2118 |
 Croatia
|
16 | |
| Olier, Anthony | 1846 |
France
|
38 | |
| Olifirenko, Oleg | 1950 |
Ukraine
|
6 | |
| Oliinyk, Serafim | 2120 |
 Serbia
|
17 | |
| Olijnyk, Olena | 2102 |
Ukraine
|
9 | |
| Olimid, Sorin | 2280 |
Romania
|
9 | |
| Olimjonov, Sarvarbek | 1986 |
 Uzbekistan
|
10 | |
| Olinici, Emanuel | 2003 |
Romania
|
1 | |
| Olishevskyi, Andriy | 2240 |
Ukraine
|
1 | |
| Olisov, Andrey | 2217 |
Russian Federation
|
3 | |
| Oliva, Daniel | 2147 |
Chile
|
21 | |
| Oliva, Jan | 1905 |
Germany
|
17 | |
| Oliva, Zamora Fernand | 2141 |
Germany
|
7 | |
| Oliva Anell, Judith | 1833 |
Spain
|
12 | |
| Oliva Castaneda, Kevel | 2490 | GM |
 Cuba
|
236 |
| Oliva Juanmarti, David | 2006 |
Spain
|
20 | |
| Oliva Martin, Pedro Antonio | 1945 |
Spain
|
11 | |
| Oliva Olave, Carlos | 2040 |
Chile
|
15 | |
| Oliva Valero, Oscar | 2083 |
Spain
|
55 | |
| Olivan Alvira, Alejandro | 1597 |
Spain
|
1 | |
| Olivares, Daniel | 1953 |
Argentina
|
50 | |
| Olivares, Danields | 2206 | FM |
 Nicaragua
|
5 |
| Olivares, Eduardo | 2062 |
Germany
|
1 | |
| Olivares, Ricardo | 1789 |
Germany
|
2 | |
| Olivares Canelles, Francisco | 2288 | FM |
Cuba
|
71 |
| Olivares Olivares, Claudio | 2287 | FM |
Chile
|
61 |
| Olivares Romero, Sara | 1819 |
Spain
|
1 | |
| Olivas Campomanes, Angel | 1872 |
Spain
|
1 | |
| Oliveira, Antonio | 2222 |
 Portugal
|
76 | |
| Oliveira, Carlos Andre Ramalho | 2092 |
Portugal
|
41 | |
| Oliveira, Eduardo Leite | 1887 |
Portugal
|
16 | |
| Oliveira, Engracia | 1709 |
 Angola
|
5 | |
| Oliveira, Henrique | 2057 |
Portugal
|
48 | |
| Oliveira, Jefferson Dos Santos | 2210 | FM |
 Brazil
|
24 |
| Oliveira, Jorge Aniceto | 1801 |
Portugal
|
16 | |
| Oliveira, Luis | 2126 |
Portugal
|
86 | |
| Oliveira, Marco | 1993 |
Portugal
|
31 | |
| Oliveira, Rodrigo | 1909 |
 Canada
|
4 | |
| Oliveira, Rogerio | 1725 |
Portugal
|
10 | |
| Oliveira, Sancho | 2242 |
France
|
43 | |
| Oliveira, Silvio Eduardo | 2284 |
Brazil
|
85 | |
| Oliveira, Tiago | 2068 |
Portugal
|
30 | |
| Oliveira, Tiago Batista | 1964 |
Brazil
|
46 | |
| Olivencia, Flavio | 2177 | FM |
Brazil
|
69 |
| Oliver, Gareth | 2164 | FM |
 Australia
|
204 |
| Oliver, Shannon | 1967 | WFM |
Australia
|
213 |
| Oliver Andres, Santiago | 1884 |
Spain
|
7 | |
| Oliver Fernandez, Rafael | 1944 |
Spain
|
1 | |
| Oliver Font, Jose Luis | 1844 |
Spain
|
62 | |
| Oliver Grammatico, Rafael | 1902 |
Spain
|
8 | |
| Oliver Marquet, Juan | 1932 |
Spain
|
37 | |
| Oliver Monfort, Sergio | 1836 |
Spain
|
2 | |
| Oliver Serrano, Angel | 2054 |
Spain
|
31 | |
| Oliver Serrano, Pedro Jose | 1947 |
Spain
|
21 | |
| Oliver Toribio, Joan | 1892 |
Spain
|
9 | |
| Olivera, Horacio | 2111 |
Argentina
|
71 | |
| Olivera Gutierrez, Albert | 1954 |
Spain
|
76 | |
| Olivera Medrano, Joan | 2349 | FM |
Fide
|
30 |
| Oliveros Alvarez, Daniel | 1977 |
Spain
|
113 | |
| Olivetan, Eric | 1846 |
France
|
2 | |
| Olivetti, Davide | 2245 | FM |
 Italy
|
7 |
| Olivetti, Pierluigi | 1944 |
Italy
|
1 | |
| Olivier, Jean | 1816 |
France
|
11 | |
| Olivier, Jean Christophe | 2277 | IM |
France
|
534 |
| Olivier, Philippe | 1858 |
France
|
29 | |
| Olivier, Pierre | 2160 |
France
|
104 | |
| Olivier, Tom | 1855 |
France
|
18 | |
| Olivieri, Martin | 2100 |
Argentina
|
84 | |
| Olivo, Gaetano | 1809 |
Italy
|
29 | |
| Olivo, Ilaria | 1918 |
Italy
|
19 | |
| Olivo, Mario | 1871 |
Italy
|
19 | |
| Olivo, Paolo | 1791 |
Italy
|
26 | |
| Oliwa, Marek | 2394 |
Poland
|
221 | |
| Oliwa, Patryk | 2244 |
Poland
|
91 | |
| Oliyazade, Pooya | 2133 |
 Iran
|
1 | |
| Oljaca, Manuel | 1962 |
Croatia
|
11 | |
| Olkhovoy, Yakov | 1837 |
Ukraine
|
7 | |
| Olkhovskiy, Alexander | 2145 |
 Israel
|
18 | |
| Olkinuora, Hannu | 1625 |
 Finland
|
43 | |
| Ollari, Luca | 1855 |
Italy
|
2 |
| Name | ELO | Title | Federation | Games |
| Olle, Peter | 2134 |
Hungary
|
99 | |
| Ollech, Dirk | 1960 |
Germany
|
5 | |
| Ollek, Karl Heinz | 1771 |
Germany
|
138 | |
| Ollenberger, Roland | 2276 | FM |
Germany
|
88 |
| Ollet, Myra | 1670 | WCM |
 Guam
|
22 |
| Ollier, Milan | 2179 |
France
|
20 | |
| Ollier, Pablo | 2301 | FM |
France
|
71 |
| Ollier, Patrice | 1566 |
France
|
8 | |
| Ollivier, Alain | 1716 |
France
|
74 | |
| Ollivier, Franck | 1740 |
France
|
4 | |
| Ollivier, Gael | 1994 |
France
|
5 | |
| Ollivier, Jacques | 1896 |
France
|
41 | |
| Ollos, Ladislav | 1881 |
 Slovakia
|
1 | |
| Olmo Canas, Andres | 1837 |
Spain
|
20 | |
| Olmo Vega, Diego | 1996 |
Spain
|
22 | |
| Olmos, Sebastian | 1876 |
Argentina
|
77 | |
| Olmos Rosa, Fernando | 1725 |
Spain
|
16 | |
| Olof, Erik | 2001 |
Netherlands
|
4 | |
| Olofsson, Henrik | 1938 |
Sweden
|
4 | |
| Olofsson-Dolk, Mattis | 2168 |
Sweden
|
86 | |
| Olos, Stanislav | 1825 |
Slovakia
|
3 | |
| Olsar, Jaroslav | 2044 | FM |
Czech Republic
|
259 |
| Olsar, Robin | 2009 |
Czech Republic
|
9 | |
| Olsar, Zdenek | 1962 |
Czech Republic
|
42 | |
| Olschewski, Martin | 1879 |
Germany
|
7 | |
| Olschok, Juergen | 1873 |
Germany
|
56 | |
| Olsen, Aage Dalstrup | 1987 |
Denmark
|
63 | |
| Olsen, Anders | 1750 |
Norway
|
88 | |
| Olsen, Andrei | 1878 |
Norway
|
42 | |
| Olsen, Birger | 1724 |
Norway
|
28 | |
| Olsen, Casper | 1971 |
Denmark
|
9 | |
| Olsen, Claus | 2084 |
Denmark
|
27 | |
| Olsen, Filip Boe | 2440 | IM |
Denmark
|
463 |
| Olsen, Heini | 2355 | FM | 445 | |
| Olsen, Helge | 1733 |
Norway
|
1 | |
| Olsen, Kim Alex | 1855 |
Denmark
|
7 | |
| Olsen, Miriam F | 2091 |
Denmark
|
154 | |
| Olsen, Nils Linde | 2083 | FM |
Denmark
|
70 |
| Olsen, Peter Erik | 2164 |
Denmark
|
146 | |
| Olsen, Robert | 1872 |
 United States
|
16 | |
| Olsen, Robin | 1997 |
Norway
|
3 | |
| Olsen, Rune | 1485 |
Norway
|
1 | |
| Olsen, Svein | 1762 |
Norway
|
3 | |
| Olsen, Trygve | 1675 |
Norway
|
7 | |
| Olsen, Wille | 1971 | 9 | ||
| Olsen, William Alexander | 2050 |
Norway
|
8 | |
| Olshansky, Alexander | 2076 |
Russian Federation
|
17 | |
| Olson, David L | 2087 |
United States
|
19 | |
| Olson, Hamish | 2362 | FM |
 Scotland
|
57 |
| Olsson, Ake | 2255 |
Sweden
|
261 | |
| 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
|
58 |
| 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
|
215 |
| 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
|
275 |
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