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Top 10 active players as of September 30, 1990

  #  

Player Rating +/-
1 Kasparov, Garry K284849
2 Karpov, Anatoly E279048
3 Ivanchuk, Vassily274348
4 Gelfand, Boris273248
5 Timman, Jan H270848
6 Salov, Valery B269851
7 Gurevich, Mikhail N269348
8 Korchnoi, Viktor L269247
9 Yudasin, Leonid G268950
10 Short, Nigel D268147

About these ratings

Top 500 active players as of September 30, 1990

  #  

Player Rating +/- Best? 75%? Age
1 Kasparov, Garry K28484973.9% #227.46
2 Karpov, Anatoly E27904816.9% #439.35
3 Ivanchuk, Vassily2743483.4% #1121.53
4 Gelfand, Boris2732482.0% #1422.27
5 Timman, Jan H2708480.7% #2438.79
6 Salov, Valery B2698510.6% #2926.34
7 Gurevich, Mikhail N2693480.3% #3231.61
8 Korchnoi, Viktor L2692470.2% #3259.52
9 Yudasin, Leonid G2689500.3% #3531.14
10 Short, Nigel D2681470.1% #4025.33
11 Khalifman, Alexander2680490.2% #4024.70
12 Beliavsky, Alexander G2679480.2% #4136.79
13 Ehlvest, Jaan2677480.2% #4227.95
14 Bareev, Evgeny2669500.1% #4923.86
15 Andersson, Ulf2664480.1% #5339.26
16 Dolmatov, Sergey V266249 #5631.61
17 Dreev, Alexey2658490.1% #5921.69
18 Jussupow, Artur M265648 #6130.63
19 Polugaevsky, Lev A265549 #6355.86
20 Lputian, Smbat G265449 #6332.63
21 Speelman, Jonathan S265248 #6433.99
22 Gavrikov, Victor N265050 #6733.17
23 Dautov, Rustem264851 #7024.84
24 Nunn, John D M264748 #7035.43
25 Ribli, Zoltán264649 #7239.06
26 Chernin, Alexander M264548 #7130.56
27 Balashov, Yury S264549 #7241.55
28 Hübner, Robert264449 #7441.90
29 Nikolic, Predrag264148 #7530.05
30 Ljubojevic, Ljubomir264149 #7639.91
31 Seirawan, Yasser264047 #7730.52
32 Portisch, Lajos263948 #7853.49
33 Tal, Mikhail263649 #8153.89
34 Aseev, Konstantin N263652 #8529.94
35 Dzindzichashvili, Roman Y263551 #8446.40
36 Tiviakov, Sergei263557 #8917.63
37 Anand, Viswanathan263449 #8520.80
38 Kamsky, Gata263350 #8516.33
39 Agdestein, Simen263251 #8823.37
40 Vaganian, Rafael A263048 #8738.95
41 Epishin, Vladimir262850 #9125.22
42 Georgiev, Kiril262749 #9124.84
43 Dvoiris, Semen I262751 #9431.91
44 Yurtaev, Leonid262653 #9631.41
45 Vyzmanavin, Alexey262551 #9530.74
46 Razuvaev, Yury S262450 #9644.96
47 Eingorn, Viacheslav S262249 #9833.85
48 Ionov, Sergey262261 #10728.73
49 Sax, Gyula262149 #9839.28
50 Vladimirov, Evgeny Y262150 #10033.69
51 Azmaiparashvili, Zurab A262049 #9930.54
52 Romanishin, Oleg M262049 #10038.72
53 Kramnik, Vladimir261959 #10815.26
54 Rozentalis, Eduardas261950 #10227.34
55 Miles, Anthony J261848 #10135.44
56 Christiansen, Larry M261750 #10334.26
57 Sokolov, Andrey Y261649 #10427.53
58 Shirov, Alexei261650 #10618.24
59 Smirin, Ilia261250 #11022.69
60 Gulko, Boris F261248 #10843.64
61 Dorfman, Iosif D261150 #11138.41
62 Sveshnikov, Evgeny E261052 #11340.63
63 Hjartarson, Jóhann260548 #11727.64
64 Yermolinsky, Alex V260155 #12732.47
65 Kruppa, Yuri260155 #12626.27
66 Oll, Lembit260050 #12424.44
67 Tukmakov, Vladimir B259748 #12644.54
68 deFirmian, Nicholas E259748 #12633.18
69 Malaniuk, Vladimir P259548 #12933.19
70 Pigusov, Evgeny259452 #13229.50
71 Makarichev, Sergey Y259352 #13336.87
72 Novikov, Igor A259350 #13228.35
73 Sturua, Zurab259267 #14431.31
74 Adams, Michael259248 #13118.87
75 Glek, Igor V259252 #13428.90
76 Goldin, Alexander259150 #13425.59
77 Kuzmin, Gennady P259153 #13644.70
78 Timoshchenko, Gennady259151 #13441.42
79 Kharitonov, Andrey Y259051 #13631.49
80 Olafsson, Helgi259050 #13534.12
81 Neverov, Valery258951 #13726.27
82 Yakovich, Yuri258951 #13827.83
83 Larsen, Bent258850 #13855.57
84 Hort, Vlastimil258749 #13846.72
85 Smagin, Sergey258748 #13732.06
86 Hansen, Curt258750 #13926.03
87 Dokhoian, Yury258650 #14025.92
88 Todorcevic, Miodrag258450 #14149.89
89 Psakhis, Lev B258348 #14131.84
90 Spassky, Boris V258349 #14253.67
91 Ftácnik, Lubomír258148 #14332.91
92 Benjamin, Joel L258148 #14426.55
93 Pintér, József258153 #14736.89
94 Kovalev, Andrei258055 #14928.90
95 Chandler, Murray G257948 #14530.49
96 Smyslov, Vassily V257949 #14569.52
97 Kurajica, Bojan257860 #15542.87
98 Fedorowicz, John P257849 #14832.01
99 Averkin, Orest N257673 #16446.60
100 Dlugy, Maxim257649 #14924.67
101 Akopian, Vladimir257550 18.81
102 Krasenkow, Michal257450 26.88
103 Kengis, Edvins257453 31.47
104 Taimanov, Mark E257460 64.65
105 Naumkin, Igor257252 25.14
106 Shneider, Aleksandr257156 28.36
107 Panchenko, Alexander N257152 36.98
108 Khenkin, Igor257152 22.52
109 Pétursson, Margeir257048 30.62
110 Kuzmin, Alexey257055 27.56
111 Nogueiras, Jesus257050 31.20
112 van der Wiel, John T H257048 31.14
113 Ulibin, Mikhail256950 19.33
114 Suba, Mihai256950 43.33
115 Lerner, Konstantin Z256950 40.59
116 Torre, Eugenio256752 38.90
117 Vaulin, Alexander256765 33.53
118 Gorelov, Sergey G256666 33.12
119 Giorgadze, Giorgi256554 25.96
120 Tseshkovsky, Vitaly V256550 46.01
121 Vasiukov, Evgeny A256550 57.57
122 Shabanov, Yury F256562 52.88
123 Smejkal, Jan256350 44.52
124 Velimirovic, Dragoljub256351 48.38
125 Rashkovsky, Nukhim N256351 44.45
126 Geller, Efim P256351 65.58
127 Minasian, Artashes256255 23.69
128 Soppe, Guillermo256262 30.04
129 Quinteros, Miguel A256257 42.76
130 Spraggett, Kevin B256149 35.89
131 Chekhov, Valery A256150 34.84
132 Wahls, Matthias256149 22.68
133 Huzman, Alexander256154 28.47
134 Morovic Fernández, Iván E256055 27.52
135 Cvitan, Ognjen256050 28.96
136 Hulak, Krunoslav255950 39.35
137 Alburt, Lev O255951 45.11
138 Sosonko, Gennadi255954 47.37
139 Zhuravliov, Valerij255864 51.80
140 Donchev, Dimitar I255857 32.19
141 Magerramov, Elmar S255753 32.47
142 Mestel, A Jonathan255755 33.55
143 Damljanovic, Branko255748 29.29
144 Kaidanov, Gregory S255751 30.96
145 Arnason, Jon L255750 29.88
146 Kalinitschew, Sergey255664 34.66
147 Kindermann, Stefan255648 30.76
148 Hodgson, Julian M255548 27.18
149 Arkhipov, Sergey255556 36.27
150 Kholmov, Ratmir D255451 65.38
151 Sokolov, Ivan255350 22.30
152 Ziatdinov, Raset255359 31.76
153 Vaisser, Anatoli255251 41.57
154 Ivanov, Alexander V255250 34.41
155 Kavalek, Lubomir255161 47.14
156 Fominyh, Alexander255157 31.29
157 Popovic, Petar255149 31.63
158 Najdorf, Miguel255071 80.46
159 Sorokin, Maxim255053 22.69
160 King, Daniel J254948 27.09
161 Janjgava, Lasha254852 20.40
162 Lanka, Zigurds254855 30.36
163 Tischbierek, Raj254752 28.02
164 Mikhalchishin, Adrian B254750 35.87
165 Rohde, Michael A254652 31.09
166 Milos, Gilberto254653 26.91
167 Knaak, Rainer F254651 37.54
168 Lalic, Bogdan254550 26.56
169 Kožul, Zdenko254449 24.36
170 Komarov, Dimitri254463 21.83
171 Malisauskas, Vidmantas254456 27.15
172 Cebalo, Mišo254350 45.65
173 Orlov, Georgi254356
174 Kudrin, Sergey254350 31.06
175 Arbakov, Valentin254356 38.67
176 Adorján, András254350 40.50
177 Kochiev, Alexander254253 34.51
178 Zapata, Alonso254250 32.11
179 Tseitlin, Mark D254265 47.02
180 Ubilava, Elizbar E254152 40.09
181 Gheorghiu, Florin254152 46.48
182 Ivanovic, Božidar254150 44.10
183 Mnatsakanian, Eduard A254174 51.81
184 Bagirov, Vladimir K254151 54.12
185 Mokrý, Karel254151 31.65
186 Hellers, Ferdinand254049 21.67
187 Rechlis, Gad254054 23.65
188 Zezulkin, Jurij254068 19.12
189 Rachels, Stuart254055 21.01
190 Browne, Walter S254050 41.72
191 Khmelnitsky, Igor N254061 22.11
192 Bikhovsky, Avigdor I254058 35.57
193 Barua, Dibyendu254059 23.92
194 Lautier, Joel253949 17.47
195 Lobron, Eric253849 30.40
196 Ye Jiangchuan253859 29.86
197 Chiburdanidze, Maia G253751 29.70
198 Machulsky, Anatoly D253658 34.02
199 Zagrebelny, Sergey253663
200 Anastasian, Ashot253554 26.20
201 Panchenko, Alexandar G253565 29.48
202 Serper, Grigory253554 21.04
203 Uhlmann, Wolfgang253551 55.50
204 Sherbakov, Ruslan253456 21.04
205 Magomedov, Magaram253355 24.36
206 Georgadze, Tamaz V253364 42.89
207 Illescas Cordoba, Miguel253349 24.82
208 Kveinys, Aloyzas253156 28.22
209 Zlotnik, Boris A253063 43.95
210 Rogers, Ian253049 30.27
211 Gofshtein, Leonid D253072 37.44
212 Palac, Mladen253053 19.62
213 Duer, Arne253064 31.22
214 Barbero, Gerardo F253052 29.11
215 Gufeld, Eduard E253057 54.53
216 Kuporosov, Viktor252958 29.01
217 Rodriguez, Amador252951 34.06
218 Yuneev, Alexey252955
219 Frias, Victor J252954 34.64
220 Vitolinš, Alvis252959 44.29
221 Wilder, Michael252953 28.04
222 Bönsch, Uwe252850 31.95
223 Anikaev, Yury252865 42.25
224 Karpman, Vadim252756 25.38
225 Veingold, Aleksander252764 36.96
226 Petrosian, Arshak B252751 36.79
227 Chudinovskih, Alexander252670 23.55
228 Piket, Jeroen252648 21.67
229 Ye Rongguang252656 26.98
230 Stohl, Igor252649 26.01
231 Petrienko, Vladimir252565 35.56
232 Darga, Klaus V252564 56.60
233 Wojtkiewicz, Aleksander252549 27.71
234 Horvath, Jozsef252450 26.13
235 Ruban, Vadim252453 26.30
236 Hansen, Lars Bo252449 22.02
237 Bischoff, Klaus252449 29.31
238 Savon, Vladimir A252353 50.01
239 Karlsson, Lars252352 35.22
240 Greenfeld, Alon252253 26.45
241 Shabalov, Alexander252152 23.05
242 Wolff, Patrick G252050 22.62
243 Henley, Ron W252068 33.82
244 Mochalov, Evgeny V252070 38.91
245 Csom, István251950 50.33
246 Moskalenko, Viktor251950 29.82
247 Adianto, Utut251967 25.54
248 Panno, Oscar R251952 55.54
249 Gipslis, Aivars251863 53.64
250 Cid, Marino Alejandro251870 32.30
251 Simic, Radoslav251756 42.31
252 Meister, Yakov251758 35.05
253 Kovacevic, Vladimir251751 48.51
254 Pfleger, Helmut251657 47.15
255 Kiselev, Sergey251653 29.04
256 Gruenberg, Hans Ulrich251651 34.72
257 Kharlov, Andrei251666 21.86
258 Bass, Leonid251557 33.33
259 Watson, William N251549 28.45
260 Belov, Igor251558
261 Marin, Mihail251553 25.44
262 Espig, Lutz251455 41.73
263 Kotronias, Vasilios251451 26.10
264 Liberzon, Vladimir M251459 53.52
265 Graf, Alexander251462 28.10
266 Baburin, Alexander251461 23.61
267 Groszpeter, Attila251449 30.31
268 Hertneck, Gerald251452 27.03
269 Dizdar, Goran251451 31.82
270 Tseitlin, Mikhail S251352 43.29
271 Klinger, Josef251250 23.31
272 Cámpora, Daniel H251250 33.25
273 London, Dimitri251273 27.86
274 Meshkov, Yuri A251270 40.70
275 Renet, Olivier251250 25.77
276 Unzicker, Wolfgang251256 65.26
277 Kosten, Anthony C251149 32.18
278 Polgar, Zsuzsa251149 21.45
279 Savchenko, Stanislav251155 23.69
280 Matulovic, Milan251157 55.30
281 Sher, Miron N251153 38.25
282 Frolov, Artur251158 20.17
283 Franco Ocampos, Zenon251152 34.38
284 Rausis, Igors250957 29.48
285 Kupreichik, Viktor D250850 41.24
286 Kozlov, V.250869
287 Granda Zuńiga, Julio E250852 23.60
288 Lukin, Andrei M250854 42.09
289 Govedarica, Radovan250770 42.63
290 Gruenfeld, Yehuda250754 34.59
291 Kishnev, Sergey250763 33.91
292 Guseinov, Aidyn250762 38.74
293 Vorotnikov, Vladislav V250665 43.12
294 Faragó, Iván250549 44.49
295 Timoshenko, Georgy250551 24.33
296 Hickl, Joerg250550 25.45
297 Meduna, Eduard250551 40.05
298 Georgiev, Krum250552 32.35
299 Rodriguez Vargas, Orestes250454 47.24
300 Nikolac, Juraj250460 58.44
301 Gaprindashvili, Nona250456 49.41
302 Zhidkov, Valery S250458 51.07
303 Xu Jun250259 28.04
304 Yrjola, Jouni250252 30.93
305 Reyes, Juan250266 27.43
306 Ivanov, Igor V250252 43.73
307 Plaskett, Jim250153 30.53
308 Vera, Reynaldo250152 29.73
309 Filipenko, Alexander V250164 41.57
310 Hebden, Mark249950 32.62
311 Vogt, Lothar H249951 38.70
312 Petkevich, Jusefs249965 49.78
313 Gligoric, Svetozar249953 67.66
314 Vukic, Milan249955 47.11
315 Brodsky, Michail249860 21.51
316 Makarov, Marat249855 27.40
317 Ivkov, Borislav249754 56.88
318 Basin, Leonid249758 32.85
319 Kantsler, Boris249758 28.45
320 Palatnik, Semen A249654 40.51
321 Djuric, Stefan249651 35.18
322 Ghinda, Mihail Viorel249658 41.18
323 Marjanovic, Slavoljub249552 35.73
324 Lin Ta249558 27.66
325 Tolnai, Tibor249549 26.02
326 Gleizerov, Evgeny249462 27.53
327 Kallai, Gabor249454 31.61
328 Sellos, Didier249365 33.61
329 Cramling, Pia249350 27.44
330 Lau, Ralf249350 30.94
331 Bronstein, David I249354 66.61
332 Schussler, Harry249352 33.27
333 Ikonnikov, Vyacheslav249263 24.54
334 Loginov, Valery A249256 34.80
335 Pekarek, Ales249256 28.79
336 García Gonzáles, Guillermo249253 36.81
337 Popchev, Milko249255 25.88
338 Van der Sterren, Paul249149 34.54
339 Varavin, Viktor249167 23.35
340 Kremenetsky, Anatoly M249174 51.71
341 Ree, Hans249054 46.04
342 Ernst, Thomas249050 30.12
343 Andrianov, Nikolai248963 28.78
344 Abramovic, Boško248951 39.63
345 Ionescu, Constantin248954 32.05
346 Inkiov, Ventzislav248850 34.36
347 Barlov, Dragan248850 33.67
348 Zaichik, Gennady L248752 33.63
349 Piskov, Yury248755 28.96
350 Sideif Sade, Fikret I248765 38.74
351 Brunner, Lucas248748 23.34
352 Antunes, Antonio248653 28.65
353 Schoenthier, Frank248575 31.87
354 Foisor, Ovidiu248560 31.48
355 Lukacs, Peter248550 40.22
356 Rubinetti, Jorge A248460 45.50
357 Mortensen, Erling248351 35.48
358 Reeh, Oliver248352 26.70
359 Hazai, Laszlo248357 37.29
360 Tringov, Georgy P248358 53.56
361 Strikovic, Aleksa248253 29.38
362 Sunye Neto, Jaime248252 33.41
363 Sahovic, Dragutin248162 50.14
364 Zilberstein, Valery I248172 47.46
365 Murey, Yakov248152 49.16
366 Brenninkmeijer, Joris248051 21.04
367 Okhotnik, Vladimir248059 40.59
368 Mainka, Romuald248051 27.37
369 Lein, Anatoly247953 59.51
370 Mirkovic, Slobodan247966 32.17
371 Poldauf, Dirk247967 25.04
372 Dzuban, Oleg I247974
373 Schmidt, Wlodzimierz247849 47.47
374 Vehi Bach, Victor Manuel247860
375 Kraidman, Yair247763 57.91
376 Ornstein, Axel247666 38.43
377 Rivas Pastor, Manuel247655 30.21
378 Dueball, Juergen247572 45.50
379 Wang Zili247560 22.29
380 Nemet, Ivan247555 47.46
381 Norwood, David247553 21.98
382 Mednis, Edmar J247552 53.52
383 Thorsteins, Karl247553 25.96
384 Saltaev, Mihail247566 27.86
385 Haba, Petr247452 25.73
386 Rytshagov, Mikhail247470 22.88
387 Blatny, Pavel247450 22.27
388 Gruenenwald, Joerg247469 25.32
389 Davies, Nigel R247450 30.16
390 Khasin, Alexander247461 39.42
391 Schmittdiel, Eckhard247349 30.38
392 Janovsky, Sergey247359 30.62
393 Novik, Maxim247369 26.80
394 Root, Douglas247368 27.63
395 Moroz, Alexander247357 29.70
396 Drasko, Milan247251 27.81
397 Kouatly, Bachar247254 32.57
398 Fernandez Garcia, Jose Luis247254 36.41
399 Moiseev, Viktor247173 31.38
400 Szekely, Peter247153 35.64
401 Titov, German247162 27.43
402 Ekstroem, Roland247158 34.36
403 Cabrilo, Goran247151 32.24
404 Reshevsky, Samuel H247162 78.84
405 Tunik, Gennady247058 37.34
406 Nikolenko, Oleg247063 31.28
407 Kogan, Boris247072
408 Ninov, Kiril247054 21.97
409 Gurevich, Vladimir247059 31.15
410 Polgar, Judit247051 14.19
411 Dimitrov, Vladimir247056 22.47
412 Bruk, Ofer247056 22.71
413 Mukhametov, Eldar246963 21.36
414 Kolev, Atanas246954 23.21
415 Dizdarevic, Emir246952 32.49
416 Gallagher, Joseph G246949 26.40
417 Miralles, Gilles246949 24.64
418 Knezevic, Milorad246755 53.91
419 Brooks, Michael A246758 29.45
420 Fishbein, Alexander246753 22.39
421 Levitt, Jonathan246650 27.32
422 Skembris, Spyridon246651 32.61
423 Vilela, Jose Luis246662 37.53
424 Winants, Luc246652 27.74
425 Kuczynski, Robert246649 24.45
426 Zhelnin, Vladimir V246561 43.55
427 Wedberg, Tom246550 36.84
428 Galliamova, Alisa246559 18.70
429 Kirov Ivanov, Nino246552 45.06
430 Fokin, Sergey246563 34.95
431 Tempone, Marcelo246557 28.06
432 Hresc, Vladimir246566 38.86
433 Anic, Darko246459 33.42
434 Jansa, Vlastimil246452 47.84
435 Rajkovic, Dusan246452 48.29
436 Howell, James C246451 23.37
437 Schlosser, Philipp246451 22.11
438 Fiorito, Fabian246457 20.91
439 Castro Rojas, Oscar Humberto246366 37.39
440 Ledger, Andrew246362 21.35
441 Marangunic, Srdjan246375 46.91
442 Byrne, Robert E246357 62.44
443 Stanojevic, Branko246372 47.74
444 Schneider, Lars Ake246357
445 Lutz, Christopher246352 19.60
446 Flear, Glenn C246249 31.63
447 Comas Fabrego, Luis246259 19.27
448 Barbulescu, Dan246275 26.27
449 Ermenkov, Evgenij246153 41.00
450 Prandstetter, Eduard246154 41.79
451 Stangl, Markus246151 21.42
452 Gomez Baillo, Jorge H246156 31.45
453 Hausner, Ivan246153 38.46
454 Akhmilovskaya, Elena246164
455 Rukavina, Josip246063 47.84
456 Murshed, Niaz246057 24.38
457 Mascarinas, Rico245954 37.58
458 Sadler, Matthew245960 16.37
459 Beshukov, Sergei245971 19.49
460 Spasov, Vasil245856 19.62
461 Womacka, Mathias245865 24.26
462 Zelcic, Robert245868 25.02
463 Bellon Lopez, Juan Manuel245852 40.39
464 Negulescu, Adrian245767 29.30
465 Temirbaev, Serik245765
466 Efimov, Igor245762 30.04
467 Kozlov, Vladimir N245762 40.33
468 Rakic, Tomislav245766 55.88
469 Orso, Miklos245663 34.31
470 Pribyl, Josef245654 42.96
471 Gonzalez, JA.245673
472 Thorhallsson, Throstur245656 21.53
473 Lanc, Alois245657 42.62
474 Legky, Nikolay A245557 35.47
475 Lima, Darcy245565 28.36
476 Servat, Roberto245560 22.65
477 Klundt, Klaus245561 48.76
478 Kovacevic, Predrag245569 30.06
479 Yuferov, Sergey N245460 44.82
480 Gurgenidze, Bukhuti I245461 56.88
481 Braga, Fernando245455 32.22
482 Pytel, Krzysztof245459 45.37
483 Arencibia, Walter245451 23.19
484 Hector, Jonny245349 26.63
485 Cramling, Dan245372 31.65
486 Nijboer, Friso245251 25.34
487 Casper, Thomas245265 31.54
488 Gutman, Lev245251 45.01
489 Ostermeyer, Peter245263 46.96
490 Ostenstad, Berge245251 26.04
491 Lechtynsky, Jiri245153 42.85
492 Lendwai, Reinhard245059 23.96
493 Shmuter, Leonid245070 21.41
494 Horváth, Csaba245052 22.32
495 Szmetan, Jorge245070 40.34
496 Joksic, Sinisa245069 49.96
497 Wells, Peter K245054 25.45
498 Veinger, Itzhak245072 52.23
499 Podzielny, Karl Heinz244975 36.05
500 Ioseliani, Nana244956 28.63

These ratings, calculated as of September 30, 1990, incorporate all games (against rated opponents) played in the time between October 1, 1989 and September 30, 1990, along with the ratings that were already calculated as of September 30, 1989. Players who have played an insufficient number of games in recent years will not appear on the list, even though you may see them on previous and/or subsequent lists. Any players who have been completely inactive for three years are removed from the list.

Definition of columns in the above list:

# refers to the player's world rank on this list.

Player is the full name of the player. Click on the player's name to see a career progression of the player's ratings.

Rating is the calculated rating for the player, as of September 30, 1990. This represents the player's estimated strength on October 1, 1990.

+/- is the standard deviation of the player's rating estimate. It is based on a geometric average of the number of rated games played in past years. Players who play very frequently will have a smaller +/- value, indicating a greater confidence in the accuracy of their rating. Players whose +/- value exceeds 76 are classified as "inactive" and removed from the ranking list due to their infrequent play against rated opponents. Mathematically, a player's rating is an estimate of their exact strength on October 1, 1990. The +/- value represents the standard deviation of that estimate; the player's true strength on October 1, 1990 should be within one standard deviation of their calculated rating approximately 68% of the time, and within two standard deviations of their calculated rating approximately 95% of the time.

Best? is the estimated likelihood that the player was actually the strongest player in the world on October 1, 1990. Since ratings are known to be inaccurate, it is possible that a lower-rated player is actually much stronger than their rating would indicate, and it is also possible that other players are weaker than their ratings would indicate. This number indicates the likelihood that the player is indeed the strongest player in the world. On a particular list, it will add up to 100% across the complete list of all players. This value is only calculated for the top 100 players on any rating list.

75%? gives a 75%-confidence world ranking for the player. Because ratings are known to be inaccurate, even if a particular player is rated third in the world, we cannot say with 100% certainty that they are truly one of the three strongest players in the world. This number indicates the world rank that we are 75% sure the player is "no worse than". Thus if a player has a value of #12 in this column, we are 75% sure that the player is one of the twelve strongest players in the world. This value is only calculated for the top 100 players on any rating list.

Age is the player's exact age in years, on September 30, 1990. If a player's age is displayed as a link, that means that this rating was active at the time of their next birthday. Click on the link to see the sorted list of all players' ratings on their birthdays when turning that same age.

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