| Name | ELO | Title | Federation | Games |
| Ostertag, Galina | 2177 |
 Russian Federation
|
19 | |
| Ostertag, Hans | 2069 |
 Germany
|
1 | |
| Ostertag, Stephan | 1852 |
Germany
|
26 | |
| Osterwald, Elwin | 2064 |
 Netherlands
|
18 | |
| Osthoff, Michael | 2088 |
Germany
|
74 | |
| Osthoff, Peter | 2056 |
Germany
|
23 | |
| Ostl, Andreas | 2270 | FM |
Germany
|
213 |
| Ostling, Hakan | 2141 |
 Sweden
|
27 | |
| Ostlund, Joar | 2331 | FM |
Sweden
|
20 |
| Ostlund, Martin | 1896 |
Sweden
|
6 | |
| Ostmark, Soren | 1805 |
Sweden
|
9 | |
| Ostmoe, Geir S. Tallaksen | 2461 | IM |
 Norway
|
391 |
| Ostner, Magnus | 2150 |
 Denmark
|
11 | |
| Ostojic, Branko | 1885 |
 Croatia
|
5 | |
| Ostojic, Goran | 2259 | FM |
 Serbia
|
3 |
| Ostojic, Katarina | 2026 | WFM |
Serbia
|
1 |
| Ostojic, Ksenija | 1825 |
Croatia
|
9 | |
| Ostojic, Miljan | 2162 |
Serbia
|
4 | |
| Ostojic, Nikola | 2248 | IM |
Serbia
|
655 |
| Ostojic, Slobodan | 1909 |
Serbia
|
27 | |
| Ostojic, Vladimir | 2157 |
Serbia
|
18 | |
| Ostojin, Dragan | 2117 |
Serbia
|
1 | |
| Ostos, Julio | 2274 | IM |
 Venezuela
|
346 |
| Ostovic, Matija | 2375 | FM |
Croatia
|
138 |
| Ostrem, Thore | 1893 |
Norway
|
3 | |
| Ostric, Zoran | 2070 |
Croatia
|
1 | |
| Ostroverkhova, Elena | 2069 |
 Ukraine
|
151 | |
| Ostrovskiy, Aleksandr A | 2381 | IM |
 United States
|
443 |
| Ostrovskiy, Anatoliy | 1953 |
United States
|
1 | |
| Ostrovskiy, Andrey | 2419 | IM |
Ukraine
|
194 |
| Ostrovskiy, Dmitriy | 1911 |
Ukraine
|
12 | |
| Ostrovsky, Alexander | 2300 | FM |
Russian Federation
|
35 |
| Ostrovsky, Sergey | 1967 |
United States
|
18 | |
| Ostrowska, Dominika | 1933 |
 Poland
|
62 | |
| Ostrowska, Marta | 1693 |
Poland
|
20 | |
| Ostrowski, Andrzej | 2208 |
Poland
|
39 | |
| Ostrowski, Leszek | 2335 | IM |
Poland
|
407 |
| Ostrowski, Michal | 1522 |
Poland
|
8 | |
| Ostrowski, Pawel | 2010 |
Poland
|
37 | |
| Ostrowski, Tadeusz | 2054 |
Poland
|
7 | |
| Ostrowsky, Alexandra | 1921 |
 Israel
|
8 | |
| Ostry, Irina | 2147 | WIM |
 Kyrgyzstan
|
115 |
| Osttveit, Martin | 1964 |
Norway
|
165 | |
| Ostwald, Tobias | 1870 |
Germany
|
13 | |
| Osuna Munoz, Javier | 2031 |
 Spain
|
60 | |
| Osuna Vega, Enrique | 2046 | CM |
Spain
|
141 |
| Osunfuyi, Abimbola | 2164 | FM |
 Nigeria
|
5 |
| Oswald, Albert | 1933 |
 Austria
|
1 | |
| Oswald, David C | 2088 |
 Scotland
|
11 | |
| Oswald, Erik | 2076 |
Germany
|
32 | |
| Oswald, Graeme E | 2142 |
 United Kingdom
|
37 | |
| Oswald, Hans Joachim | 2259 | FM |
Germany
|
181 |
| Oswald, Heinz | 1971 |
Austria
|
30 | |
| Oswald, Jan | 1726 |
 Slovakia
|
10 | |
| Oswald, Michael | 1949 |
Germany
|
82 | |
| Oszczanowski, Witold | 2077 |
Poland
|
1 | |
| Oszmian, Natalia | 1728 |
Poland
|
10 | |
| Osztobanyi, Zoltan | 2108 |
 Hungary
|
27 | |
| Osztruzslik, Mark | 1896 |
Slovakia
|
5 | |
| Otalora, Carlos Eduardo | 2135 | FM |
 Colombia
|
14 |
| Otano Villanueva, Joseba | 1798 |
Spain
|
42 | |
| Otawa, Yuto | 2165 |
 Japan
|
46 | |
| Otazo, Annyd | 1998 |
Venezuela
|
68 | |
| Otazu Ojer, Inigo | 1923 |
Spain
|
22 | |
| Otazu Ojer, Javier | 1882 |
Spain
|
36 | |
| Otchiev, Mikhail | 1960 |
Russian Federation
|
10 | |
| Otegenov, Sultan | 2136 |
 Kazakhstan
|
1 | |
| Otene, Edith | 1899 |
 New Zealand
|
102 | |
| Otepka, Vladimir | 1796 |
Slovakia
|
4 | |
| Oteri, Aldo | 1826 |
 Italy
|
3 | |
| Otero, Carlos | 1814 |
 Argentina
|
31 | |
| Otero, Christian | 1647 |
Argentina
|
8 | |
| Otero, Evelio | 2385 | IM |
 Cuba
|
93 |
| Otero, Gustavo | 1947 |
 Uruguay
|
11 | |
| Otero, Harlen | 2149 |
Venezuela
|
26 | |
| Otero Acosta, Diasmany | 2387 | IM |
Cuba
|
385 |
| Otero Chaves, Carlos Miguel | 1810 |
Spain
|
13 | |
| Otero de la Roza, Alberto | 2122 |
Spain
|
84 | |
| Otero Garzon, Gustavo | 2200 |
Argentina
|
14 | |
| Otero Marino, Alain | 2250 | IM |
Cuba
|
14 |
| Otero Nogueira, Brais | 2122 |
Spain
|
29 | |
| Otero Ramirez, Angel | 1782 |
Spain
|
7 | |
| Otero Salgas, Carles | 1946 |
Spain
|
27 | |
| Otero Salgas, Jordi | 1893 |
Spain
|
3 | |
| Otero Velasco, Federico | 1762 |
Spain
|
10 | |
| Otgonbat, Cendayush | 2193 |
 Mongolia
|
24 | |
| Otgonjargal, Sengeravdan | 2160 | WIM |
Mongolia
|
63 |
| Othman, A Moussa | 2241 | FM |
 United Arab Emirates
|
281 |
| Othman, Mustapha | 2026 |
Nigeria
|
10 | |
| Othman, Rabeea | 1950 |
United Arab Emirates
|
50 | |
| Othmer, Michael | 1968 |
Germany
|
12 | |
| Otikova, Elina | 2073 | WFM |
 Latvia
|
16 |
| Otirba, Daut | 2047 |
Russian Federation
|
9 | |
| Otisitswe Ruth | 1772 |
 Botswana
|
9 | |
| Otkidach, Oleg | 2128 |
Russian Federation
|
17 | |
| Otland, Soren | 2029 |
Denmark
|
9 | |
| Otman, Viktor | 2220 |
Russian Federation
|
8 | |
| Otmani, Kamel | 2121 |
 France
|
12 | |
| Otorbaeva, Nuriza | 1836 |
Kyrgyzstan
|
19 | |
| Ototiuk, Dmitriy | 2170 |
Russian Federation
|
17 | |
| Otovic, Ljiljana | 2030 |
Serbia
|
20 | |
| Otruba, Marek | 2004 |
 Czech Republic
|
15 | |
| Otsuka, Shou | 2138 |
Japan
|
10 | |
| Ott, Anton | 1972 |
Germany
|
5 | |
| Ott, Florian | 2290 | FM |
Germany
|
34 |
| Ott, Frank | 2313 |
Germany
|
201 | |
| Ott, Guenter | 1816 |
Germany
|
52 | |
| Ott, Herbert | 1753 |
Germany
|
33 | |
| Ott, Joerg | 2001 |
Austria
|
48 | |
| Ott, Lothar | 1745 |
Germany
|
15 | |
| Ott, Mathias | 2012 |
Germany
|
46 | |
| Ott, Richard | 1662 |
 Canada
|
43 | |
| Ott, Roland | 2255 |
 Switzerland
|
65 | |
| Ott, Wolfgang | 2291 | IM |
Germany
|
104 |
| Ottavi, Marco | 1979 |
Italy
|
50 | |
| Otte, Burkhard | 1909 |
Germany
|
2 | |
| Otte, Marco | 1864 |
Germany
|
91 | |
| Otte, Marijn | 2186 | FM |
Netherlands
|
147 |
| Otten, Colleen | 1992 |
Netherlands
|
48 | |
| Otten, Martijn | 2183 |
Netherlands
|
17 | |
| Otten, Peter | 1829 |
Denmark
|
4 | |
| Otten, Remmelt | 2120 |
Netherlands
|
4 | |
| Ottenburg, Ralph | 1962 |
Germany
|
21 | |
| Ottenklev, Niklas | 2112 |
Sweden
|
14 | |
| Ottens, Stephan | 2197 |
Germany
|
168 | |
| Otterbach, Gerhard | 1764 |
Germany
|
14 | |
| Otterlei, Olav | 1925 |
Norway
|
18 | |
| Ottl, Eric | 1724 |
France
|
9 | |
| Ottmann, Josef | 2163 |
Germany
|
29 | |
| Ottmann, Martin | 2125 |
Germany
|
56 | |
| Ottmann, Peter | 2155 |
Germany
|
22 | |
| Otto, Andreas | 2108 |
Germany
|
171 | |
| Otto, Bram | 2065 |
Netherlands
|
21 | |
| Otto, Klaus | 1770 |
Germany
|
54 | |
| Otto, Marco | 1903 |
Germany
|
9 | |
| Otto, Michael | 1863 |
Germany
|
34 | |
| Otto, Paul | 1642 |
Netherlands
|
5 | |
| Otto, Robert | 1911 |
Netherlands
|
3 | |
| Otto, Wilfried | 1768 |
Germany
|
6 | |
| Ottolini, Graziano | 1940 |
Italy
|
20 | |
| Ottosen, David | 2067 |
Canada
|
80 | |
| Ottosen, Peder | 2065 |
Denmark
|
12 | |
| Ottosson, Bjorn | 1854 |
Sweden
|
28 | |
| Ottstadt, Ralph | 2185 | CM |
Germany
|
108 |
| Ottway, Christopher | 1987 |
Germany
|
28 | |
| Otxoantesana Beitia, Arkaitz | 1791 |
Spain
|
9 | |
| Ouadi, Ali | 1939 |
France
|
26 | |
| Ouadi, Wahbi | 1875 |
France
|
18 | |
| Ouahhoud, Yassine | 1799 |
France
|
1 | |
| Ouakhir, Mehdi | 2256 | CM |
 Morocco
|
147 |
| Name | ELO | Title | Federation | Games |
| Oualili, Abdelali | 1866 |
Morocco
|
1 | |
| Oud, Niek | 1902 |
Netherlands
|
127 | |
| Oude Brunink, Elias | 1907 |
Netherlands
|
63 | |
| Oudejans, Martin | 1782 |
Netherlands
|
46 | |
| Oudewaal, Vincent | 2063 |
Netherlands
|
5 | |
| Oudot, Jean Baptiste | 2111 |
France
|
44 | |
| Oudshoorn, Arres | 2139 |
Netherlands
|
33 | |
| Ouechtati, Mohamed | 2259 |
 Tunisia
|
25 | |
| Ouellet, Maili-Jade | 2267 | WGM |
Canada
|
147 |
| Ouerk, Yanis | 2355 |
France
|
10 | |
| Oulovsky, Pavel | 2160 |
Czech Republic
|
22 | |
| Ouma, Stephen | 2009 | FM |
 Kenya
|
17 |
| Oumar, Sylla | 1924 |
 Mauritania
|
8 | |
| Oumaziz, Paul | 1916 |
France
|
6 | |
| Oumnov, Aleksei | 2185 |
Germany
|
50 | |
| Oumzil, Christophe | 1918 |
France
|
3 | |
| Ounas, Abdelhak | 2018 |
 Algeria
|
9 | |
| Oupindrin, Narayanin | 1912 |
France
|
33 | |
| Ouradou, Frederic | 1768 |
France
|
12 | |
| Ourrag, William | 1890 |
France
|
2 | |
| Oussedik, Elias | 2157 |
Canada
|
8 | |
| Oussedik, Mahfoud | 2404 | IM |
Algeria
|
59 |
| Outeiro Padin, Heladio | 1813 |
Spain
|
11 | |
| Outerelo Ucha, Manuel | 2125 | CM |
Spain
|
193 |
| Outgajjouft, Said | 2045 |
Sweden
|
13 | |
| Outioupine, Vladimir | 2123 |
Russian Federation
|
34 | |
| Outomuro Nieves, Rafael | 1843 |
Spain
|
54 | |
| Outulny, Pavel | 2076 |
Czech Republic
|
32 | |
| Ouwendijk, Vincent | 2176 |
Netherlands
|
70 | |
| Ouwens, Bert | 1962 |
Netherlands
|
4 | |
| Ouwersloot, Hans | 1937 |
Netherlands
|
12 | |
| Ovalle, Edgar | 2102 |
 Guatemala
|
1 | |
| Ovalle Burgos, Ramon | 2214 | CM |
 Puerto Rico
|
40 |
| Ovalles, Otto | 2159 |
Venezuela
|
23 | |
| Ovaskainen, Juha | 1938 |
Italy
|
45 | |
| Ovcharov, Taras | 1968 |
Ukraine
|
45 | |
| Ovchinnikov, Alexey | 2188 |
Russian Federation
|
22 | |
| Ovchinnikov, Andrey V. | 1750 |
Russian Federation
|
7 | |
| Ovchinnikov, Valentin | 1930 |
Russian Federation
|
9 | |
| Ovchinnikov, Vsevolod | 1639 |
Russian Federation
|
106 | |
| Ovchinnikov, Yury | 2129 |
Russian Federation
|
9 | |
| Ovcina, Dennis | 2149 |
 South Africa
|
22 | |
| Ovechkin, Igor V | 2357 | FM |
Russian Federation
|
17 |
| Ovechkin, Lilia | 1833 |
Israel
|
7 | |
| Oveisi, Reza | 2057 |
 Iran
|
1 | |
| Ovejero, Juan Manuel | 2260 |
Argentina
|
41 | |
| Over, Klaus | 1990 |
Germany
|
28 | |
| Overas, Alf | 1740 |
Norway
|
2 | |
| Overbeck, Christopher | 1948 |
Germany
|
84 | |
| Overbeck, Thorsten | 2257 | FM |
Germany
|
211 |
| Overeem, Marc | 2075 | FM |
Netherlands
|
149 |
| Overesch, Andre | 2000 |
Germany
|
39 | |
| Overesch, Dieter | 1910 |
Germany
|
49 | |
| Overgaard, Christian Monrad | 2250 |
Denmark
|
32 | |
| Overgaard, Jorgen | 1836 |
Denmark
|
6 | |
| Overhoff, Klaus | 1575 |
Germany
|
19 | |
| Overlingas, Akeras | 2088 |
United States
|
9 | |
| Overmark, Ole | 1821 |
Denmark
|
20 | |
| Overveld, Ronald | 2232 |
Netherlands
|
16 | |
| Ovesen, Karsten | 1857 |
Norway
|
54 | |
| Ovetchkin, Roman | 2520 | GM |
Russian Federation
|
886 |
| Ovezdurdiyeva, Jemal | 2061 | WFM |
 Turkmenistan
|
116 |
| Ovezov, Artek | 2190 | FM |
Turkmenistan
|
71 |
| Ovezova, Maisa | 2079 | WFM |
Turkmenistan
|
177 |
| Ovezova, Maral | 2053 | WFM |
Turkmenistan
|
43 |
| Oviedo, Horacio | 2052 |
Argentina
|
12 | |
| Oviedo, Manuel | 1994 |
Argentina
|
8 | |
| Oviedo Acosta, Paula | 1819 | WCM |
 Paraguay
|
21 |
| Oviedo Rodriguez, Juan Jose | 2124 |
Spain
|
2 | |
| Oviedo Rodriguez, Miguel Angel | 1914 |
Spain
|
4 | |
| Ovod, Evgenija | 2247 | IM |
 Fide
|
1088 |
| Ovod, Inga | 1988 |
Russian Federation
|
25 | |
| Ovod, Irina | 1791 |
Russian Federation
|
19 | |
| Ovodenko, Igor | 2202 |
Russian Federation
|
18 | |
| Ovsejevitsch, Sergei | 2576 | GM |
Ukraine
|
769 |
| Ovsepyan, Arshak | 2208 |
Germany
|
2 | |
| Ovsiannikov, Ilia | 2136 |
Russian Federation
|
9 | |
| Ovsiannikov, Maxim | 2409 | FM |
Russian Federation
|
129 |
| Ovsiannikov, Yuri | 2049 |
Ukraine
|
18 | |
| Ovsienko, Valentin | 2112 |
France
|
1 | |
| Owczarzak, Jerzy | 2326 | FM |
Poland
|
279 |
| Oweger, Siegfried | 2010 |
Germany
|
16 | |
| Owen, Dennis | 1974 |
United Kingdom
|
10 | |
| Owen, Michael | 2123 | CM |
 Indonesia
|
9 |
| Owens, Megan R | 1917 |
Wales
|
103 | |
| Owocki, Jacek | 2066 |
Poland
|
13 | |
| Owosina, Tolani | 2120 |
Nigeria
|
52 | |
| Oyaga Valencia, Jesus Maria | 1735 |
Spain
|
2 | |
| Oyama, Akito | 2197 |
United Kingdom
|
24 | |
| Oyarzo, Daniel | 2005 |
 Chile
|
1 | |
| Oyarzun, Fernando | 2089 |
Chile
|
6 | |
| Oye, Olav | 1495 |
Norway
|
21 | |
| Oye-Stromberg, Alexander | 2267 | FM |
Norway
|
103 |
| Oyenga, Justine Anassika | 1503 |
 Togo
|
8 | |
| Oyola, Carlos | 2088 |
Chile
|
1 | |
| Oyunbaatar, Tumendemberel | 2063 | FM |
Mongolia
|
25 |
| Oz, Irem Ezra | 1911 |
 Turkey
|
11 | |
| Oza, Nikunj | 1738 |
United States
|
24 | |
| Oza, Rajesh | 1907 |
 India
|
20 | |
| Ozaki, Yukitaka | 2058 |
Japan
|
38 | |
| Ozalp, Burak | 2127 | CM |
Turkey
|
9 |
| Ozanic, Marijan | 2034 | FM |
Croatia
|
52 |
| Ozanne, Mark S | 1996 | CM |
 Guernsey
|
61 |
| Ozates, Tuna | 2290 | FM |
Turkey
|
17 |
| Ozbay, Ece | 1955 | WFM |
Turkey
|
71 |
| Ozbek, Busra | 1850 |
Turkey
|
7 | |
| Ozbek, Cenker | 1702 |
Turkey
|
2 | |
| Ozbek, Gorkem | 1852 |
Turkey
|
5 | |
| Ozbek, Ismail Can | 1790 |
Turkey
|
11 | |
| Ozbilen, Hayri | 2046 |
Turkey
|
11 | |
| Ozcan, Kaan | 2227 | FM |
Turkey
|
10 |
| Ozcan, Kerem | 1822 |
Turkey
|
8 | |
| Ozcan, Sezer | 1843 |
Turkey
|
3 | |
| Ozdemir, Ozan | 1851 |
Turkey
|
15 | |
| Ozdemir, Serhan Berat | 2225 | FM |
Turkey
|
51 |
| Ozdemir, Timur | 1980 |
Turkey
|
2 | |
| Ozdogan, Baran | 1989 |
Turkey
|
9 | |
| Oze, Krisztian | 1995 |
Hungary
|
6 | |
| Oze, Norbert | 2014 |
Hungary
|
6 | |
| Ozegovic, Ilija | 1947 |
Serbia
|
1 | |
| Ozen, Ali | 1742 |
Turkey
|
1 | |
| Ozen, Bahadir | 2357 | IM |
Turkey
|
118 |
| Ozen, Burak | 1971 |
Turkey
|
12 | |
| Ozen, Deniz | 2394 | IM |
Turkey
|
244 |
| Ozenir, Ekin Baris | 2390 | IM |
Turkey
|
175 |
| Ozenne, Corentin | 2161 |
France
|
5 | |
| Ozer, Omer Faruk | 2337 | IM |
Turkey
|
113 |
| Ozerkman, Mehmet | 1940 |
Turkey
|
9 | |
| Ozerov, Dmitry | 2172 |
Russian Federation
|
9 | |
| Ozerov, Ilja | 2185 |
Germany
|
55 | |
| Ozgibcev, Anatoly | 2347 |
Russian Federation
|
142 | |
| Ozguner, Hakki Ata | 2100 |
Turkey
|
9 | |
| Ozgur, Tibet Kagan | 1976 |
Turkey
|
11 | |
| Ozkan, Charlie | 1941 |
Canada
|
23 | |
| Ozkan, Ervin | 2147 | CM |
Turkey
|
25 |
| Ozkan, Ozgur Ozge | 1882 |
Turkey
|
9 | |
| Ozkan, Taha | 2247 | FM |
Turkey
|
38 |
| Ozkoc, Ali | 1837 |
Turkey
|
11 | |
| Ozmen, Halil | 2006 |
Turkey
|
5 | |
| Ozog, Leon | 2009 |
Poland
|
45 | |
| Ozoglu, Berker | 1883 |
Turkey
|
12 | |
| Ozolin, Maxim | 2365 | IM |
Russian Federation
|
157 |
| Ozolins, Ansis | 2063 |
Latvia
|
1 | |
| Ozolins, Aris | 2147 | FM |
Latvia
|
34 |
| Ozoy, Akin | 1776 |
Turkey
|
10 | |
| Ozsac, Samet Harun | 2192 | FM |
Turkey
|
12 |
| Ozsakallioglu, Akin | 2003 |
Turkey
|
7 | |
| Ozsakallioglu, Okan | 2401 | FM |
Turkey
|
161 |
| Ozsoy, Alimert | 2198 | FM |
Turkey
|
20 |
| Ozsoy, Nadir | 1885 |
Turkey
|
12 |
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