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Top 10 active players as of February 28, 1990

  #  

Player Rating +/-
1 Kasparov, Garry K285848
2 Karpov, Anatoly E279148
3 Ivanchuk, Vassily272549
4 Timman, Jan H272448
5 Salov, Valery B271349
6 Gelfand, Boris269849
7 Korchnoi, Viktor L269447
8 Short, Nigel D269047
9 Gurevich, Mikhail N268749
10 Ehlvest, Jaan267748

About these ratings

Top 500 active players as of February 28, 1990

  #  

Player Rating +/- Best? 75%? Age
1 Kasparov, Garry K28584880.2% #126.87
2 Karpov, Anatoly E27914814.3% #438.76
3 Ivanchuk, Vassily2725491.3% #1620.94
4 Timman, Jan H2724481.1% #1738.21
5 Salov, Valery B2713490.8% #2125.76
6 Gelfand, Boris2698490.4% #2921.68
7 Korchnoi, Viktor L2694470.2% #3158.93
8 Short, Nigel D2690470.2% #3324.74
9 Gurevich, Mikhail N2687490.2% #3631.02
10 Ehlvest, Jaan2677480.1% #4427.37
11 Beliavsky, Alexander G2672480.1% #4736.20
12 Andersson, Ulf2670480.1% #4838.67
13 Yudasin, Leonid G2669500.1% #5130.55
14 Dolmatov, Sergey V2669490.1% #5031.02
15 Khalifman, Alexander266449 #5524.11
16 Lputian, Smbat G266349 #5632.04
17 Nunn, John D M265848 #6034.84
18 Dreev, Alexey265549 #6321.11
19 Ribli, Zoltán265348 #6538.48
20 Ljubojevic, Ljubomir265248 #6539.32
21 Speelman, Jonathan S265248 #6633.40
22 Vaganian, Rafael A265248 #6738.37
23 Polugaevsky, Lev A265150 #6855.27
24 Tal, Mikhail264749 #7053.30
25 Bareev, Evgeny264750 #7223.27
26 Jussupow, Artur M264648 #7230.04
27 Dautov, Rustem264651 #7324.25
28 Portisch, Lajos264648 #7152.90
29 Seirawan, Yasser264548 #7329.92
30 Christiansen, Larry M264350 #7633.67
31 Yurtaev, Leonid264252 #7930.82
32 Vladimirov, Evgeny Y264152 #7933.11
33 Sokolov, Andrey Y263949 #8126.93
34 Nikolic, Predrag263848 #8029.46
35 Gavrikov, Victor N263849 #8132.58
36 Gulko, Boris F263849 #8143.05
37 Hübner, Robert263848 #8041.31
38 Vyzmanavin, Alexey263651 #8430.16
39 Aseev, Konstantin N263551 #8529.36
40 Chernin, Alexander M263448 #8529.97
41 Agdestein, Simen263251 #8922.79
42 Tukmakov, Vladimir B263149 #8943.95
43 Sax, Gyula262948 #9038.69
44 Azmaiparashvili, Zurab A262850 #9329.94
45 Shirov, Alexei262650 #9417.65
46 Epishin, Vladimir262350 #9924.63
47 Sveshnikov, Evgeny E262151 #10140.05
48 Balashov, Yury S262048 #9940.95
49 Razuvaev, Yury S261950 #10344.38
50 Oll, Lembit261850 #10423.85
51 Dvoiris, Semen I261750 #10631.32
52 Dzindzichashvili, Roman Y261652 #10845.81
53 Timoshchenko, Gennady261551 #10840.84
54 Ivanov, Alexander V261453 #11033.82
55 Pigusov, Evgeny261452 #11028.91
56 Miles, Anthony J261448 #10734.85
57 Eingorn, Viacheslav S261349 #10933.26
58 Anand, Viswanathan261250 #11120.21
59 Smirin, Ilia261150 #11222.10
60 Georgiev, Kiril261050 #11324.25
61 Dorfman, Iosif D260852 #11737.82
62 Rozentalis, Eduardas260850 #11626.75
63 Psakhis, Lev B260848 #11431.25
64 Goldin, Alexander260650 #11725.00
65 Lerner, Konstantin Z260350 #12139.99
66 Novikov, Igor A260251 #12327.76
67 deFirmian, Nicholas E260249 #12232.59
68 Smyslov, Vassily V260150 #12368.92
69 Romanishin, Oleg M260048 #12338.13
70 Panchenko, Alexandar G2599710.1% #14028.89
71 Kruppa, Yuri259954 #12825.69
72 Makarichev, Sergey Y259854 #12936.28
73 Pétursson, Margeir259848 #12530.04
74 Fedorowicz, John P259749 #12731.42
75 Hort, Vlastimil259649 #12846.13
76 Yermolinsky, Alex V259355 #13531.88
77 Dokhoian, Yury259050 #13525.34
78 Kovalev, Andrei259057 #14028.31
79 Ulibin, Mikhail259051 #13618.74
80 Todorcevic, Miodrag258950 #13649.30
81 Cherepkov, Alexander V2588760.1% #15369.33
82 Ftácnik, Lubomír258748 #13732.33
83 Spassky, Boris V258748 #13753.08
84 Hansen, Curt258749 #13825.44
85 Vasiukov, Evgeny A258750 #13956.97
86 Akopian, Vladimir258750 #13918.22
87 Panchenko, Alexander N258653 #14136.40
88 Krasenkow, Michal258650 #14026.29
89 Kamsky, Gata258653 #14315.74
90 Kharitonov, Andrey Y258650 #14030.90
91 Yakovich, Yuri258553 #14327.25
92 Sturua, Zurab258466 #15330.72
93 Malaniuk, Vladimir P258348 #14232.60
94 Rashkovsky, Nukhim N258351 #14443.86
95 Kramnik, Vladimir258360 #14914.68
96 Kveinys, Aloyzas258159 #15127.64
97 Taimanov, Mark E258156 #14864.06
98 Tiviakov, Sergei258158 #14917.04
99 van der Wiel, John T H258147 #14330.55
100 Chandler, Murray G258149 #14529.90
101 Tseshkovsky, Vitaly V258150 45.43
102 Smagin, Sergey258049 31.47
103 Giorgadze, Giorgi257953 25.38
104 Neverov, Valery257852 25.69
105 Spraggett, Kevin B257851 35.30
106 Nogueiras, Jesus257749 30.61
107 Shabanov, Yury F257763 52.30
108 Smejkal, Jan257750 43.93
109 Hjartarson, Jóhann257548 27.05
110 Torre, Eugenio257551 38.32
111 Chekhov, Valery A257550 34.25
112 Shneider, Aleksandr257457 27.77
113 Ubilava, Elizbar E257451 39.50
114 Kuzmin, Gennady P257353 44.11
115 Kengis, Edvins257353 30.88
116 Sokolov, Ivan257249 21.71
117 Khenkin, Igor257253 21.93
118 Glek, Igor V257152 28.31
119 Bikhovsky, Avigdor I257063 34.97
120 Kurajica, Bojan257060 42.29
121 Olafsson, Helgi256950 33.54
122 Larsen, Bent256849 54.98
123 Adams, Michael256649 18.28
124 Palac, Mladen256655 19.03
125 Janjgava, Lasha256554 19.81
126 Huzman, Alexander256453 27.88
127 Pintér, József256452 36.30
128 Gorelov, Sergey G256363 32.53
129 Morovic Fernández, Iván E256356 26.92
130 Velimirovic, Dragoljub256350 47.79
131 Soppe, Guillermo256262 29.45
132 Kuzmin, Alexey256154 26.97
133 Hulak, Krunoslav255950 38.76
134 Dlugy, Maxim255649 24.08
135 Kochiev, Alexander255652 33.92
136 Sosonko, Gennadi255653 46.78
137 Sorokin, Maxim255654 22.10
138 Hodgson, Julian M255548 26.59
139 Popovic, Petar255549 31.04
140 Mestel, A Jonathan255558 32.95
141 Ionov, Sergey255564 28.14
142 Vaulin, Alexander255473 32.94
143 Benjamin, Joel L255449 25.96
144 Donchev, Dimitar I255356 31.60
145 Vaisser, Anatoli255250 40.97
146 Mikhalchishin, Adrian B255250 35.28
147 Kavalek, Lubomir255263 46.55
148 Bönsch, Uwe255250 31.37
149 Timoshenko, Georgy255253 23.74
150 Anikaev, Yury255169 41.66
151 Magerramov, Elmar S255152 31.88
152 Kholmov, Ratmir D255051 64.79
153 Lalic, Bogdan255050 25.97
154 Cvitan, Ognjen254949 28.38
155 Ye Rongguang254859 26.40
156 Kudrin, Sergey254850 30.47
157 Petrienko, Vladimir254863 34.96
158 King, Daniel J254849 26.50
159 Rogers, Ian254850 29.68
160 Kindermann, Stefan254748 30.17
161 Arkhipov, Sergey254759 35.68
162 Kalinitschew, Sergey254762 34.07
163 Tischbierek, Raj254652 27.43
164 Rohde, Michael A254552 30.51
165 Orlov, Georgi254559
166 Browne, Walter S254551 41.13
167 Najdorf, Miguel254567 79.87
168 Kuporosov, Viktor254567 28.42
169 Ruban, Vadim254553 25.71
170 Zhuravliov, Valerij254463 51.21
171 Frolov, Artur254456 19.58
172 Mnatsakanian, Eduard A254468 51.23
173 Quinteros, Miguel A254366 42.17
174 Khmelnitsky, Igor N254361 21.52
175 Adorján, András254351 39.91
176 Cebalo, Mišo254250 45.06
177 Geller, Efim P254251 64.98
178 Uhlmann, Wolfgang254252 54.91
179 Milos, Gilberto254154 26.33
180 Suba, Mihai254151 42.74
181 Machulsky, Anatoly D254158 33.43
182 Ye Jiangchuan254159 29.27
183 Rachels, Stuart254158 20.42
184 Kaidanov, Gregory S253952 30.38
185 Zagrebelny, Sergey253862
186 Panno, Oscar R253853 54.94
187 Knaak, Rainer F253751 36.94
188 Moskalenko, Viktor253751 29.23
189 Csom, István253650 49.74
190 Lobron, Eric253649 29.81
191 Wojtkiewicz, Aleksander253651 27.12
192 Damljanovic, Branko253648 28.70
193 Lanka, Zigurds253554 29.77
194 Minasian, Artashes253454 23.10
195 Groszpeter, Attila253450 29.72
196 Marin, Mihail253453 24.85
197 Duer, Arne253365 30.63
198 Henley, Ron W253275 33.23
199 Serper, Grigory253154 20.46
200 Karpman, Vadim253155 24.79
201 Vorotnikov, Vladislav V253165 42.53
202 Bass, Leonid253060 32.75
203 Wilder, Michael253051 27.45
204 Barua, Dibyendu253056 23.34
205 Savchenko, Stanislav252955 23.10
206 Chudinovskih, Alexander252970 22.96
207 Illescas Cordoba, Miguel252950 24.23
208 Wahls, Matthias252849 22.09
209 Vitolinš, Alvis252858 43.70
210 Horvath, Jozsef252849 25.54
211 Gruenfeld, Yehuda252752 33.99
212 Lukin, Andrei M252653 41.50
213 Darga, Klaus V252664 56.01
214 Karlsson, Lars252651 34.63
215 Gheorghiu, Florin252651 45.89
216 Kovacevic, Vladimir252650 47.92
217 Brodsky, Michail252660 20.91
218 Kožul, Zdenko252649 23.77
219 Mokrý, Karel252550 31.06
220 Bagirov, Vladimir K252551 53.53
221 Rodriguez, Amador252450 33.47
222 Naumkin, Igor252455 24.55
223 Sher, Miron N252454 37.66
224 Zapata, Alonso252450 31.52
225 Veingold, Aleksander252364 36.38
226 Pfleger, Helmut252356 46.56
227 Gufeld, Eduard E252355 53.94
228 Bischoff, Klaus252349 28.72
229 Komarov, Dimitri252260 21.24
230 Arbakov, Valentin252260 38.08
231 Alburt, Lev O252252 44.52
232 Greenfeld, Alon252153 25.86
233 Tseitlin, Mark D252160 46.43
234 Espig, Lutz252157 41.15
235 Malisauskas, Vidmantas252054 26.57
236 Ivanovic, Božidar252050 43.51
237 Magomedov, Magaram252055 23.77
238 Liberzon, Vladimir M251958 52.93
239 Chiburdanidze, Maia G251952 29.11
240 Hebden, Mark251850 32.04
241 Anastasian, Ashot251852 25.62
242 Georgadze, Tamaz V251862 42.30
243 Rodriguez Vargas, Orestes251856 46.65
244 Murey, Yakov251850 48.57
245 Baburin, Alexander251863 23.03
246 Kiselev, Sergey251753 28.46
247 London, Dimitri251765 27.27
248 Savon, Vladimir A251753 49.42
249 Rausis, Igors251756 28.89
250 Meshkov, Yuri A251772 40.11
251 Gofshtein, Leonid D251569 36.85
252 Renet, Olivier251549 25.19
253 Inkiov, Ventzislav251450 33.78
254 Kishnev, Sergey251463 33.32
255 Barbero, Gerardo F251451 28.52
256 Palatnik, Semen A251454 39.92
257 Kosic, Dragan251457 20.04
258 Hellers, Ferdinand251449 21.08
259 Meister, Peter251456 23.68
260 Arnason, Jon L251350 29.29
261 Cámpora, Daniel H251350 32.66
262 Gleizerov, Evgeny251363 26.93
263 Petrosian, Arshak B251350 36.20
264 Yuneev, Alexey251354
265 Lin Ta251363 27.08
266 Meyer, E.251272
267 Adianto, Utut251265 24.94
268 Vera, Reynaldo251251 29.14
269 Marjanovic, Slavoljub251251 35.14
270 Gipslis, Aivars251160 53.05
271 Piket, Jeroen251148 21.09
272 Graf, Alexander251160 27.51
273 Basin, Leonid251056 32.26
274 Van der Sterren, Paul251049 33.94
275 Ivanov, Igor V250952 43.14
276 Loginov, Valery A250862 34.21
277 Unzicker, Wolfgang250856 64.67
278 Govedarica, Radovan250767 42.04
279 Kupreichik, Viktor D250749 40.65
280 Gruenberg, Hans Ulrich250750 34.14
281 Dizdar, Goran250651 31.23
282 Franco Ocampos, Zenon250652 33.79
283 Moroz, Alexander250657 29.11
284 Faragó, Iván250549 43.91
285 Polgar, Zsuzsa250549 20.86
286 Thorhallsson, Throstur250560 20.94
287 Ninov, Kiril250554 21.39
288 Sherbakov, Ruslan250459 20.46
289 Ghinda, Mihail Viorel250458 40.59
290 Kotronias, Vasilios250350 25.51
291 Lau, Ralf250350 30.36
292 Tseitlin, Mikhail S250352 42.70
293 Belov, Igor250358
294 Foisor, Ovidiu250258 30.89
295 Vogt, Lothar H250252 38.11
296 Stoica, Valentin250273 40.04
297 Tolnai, Tibor250249 25.43
298 Sellos, Didier250259 33.02
299 Yrjola, Jouni250152 30.34
300 Shabalov, Alexander250153 22.46
301 Djuric, Stefan250151 34.59
302 Kallai, Gabor250153 31.02
303 Watson, William N250149 27.86
304 Hickl, Joerg250050 24.87
305 Xu Jun250057 27.45
306 Stohl, Igor250050 25.42
307 Frias, Victor J249958 34.05
308 Zaichik, Gennady L249851 33.05
309 Hansen, Lars Bo249848 21.43
310 Guseinov, Aidyn249863 38.16
311 Kosten, Anthony C249749 31.59
312 Georgiev, Krum249751 31.76
313 Vukic, Milan249755 46.53
314 Meduna, Eduard249750 39.46
315 Mainka, Romuald249652 26.79
316 Tisdall, Jonathan D249651 31.51
317 Reyes, Juan249662 26.84
318 Sahovic, Dragutin249661 49.55
319 Cramling, Pia249551 26.85
320 Petkevich, Jusefs249561 49.19
321 Lautier, Joel249549 16.88
322 Wolff, Patrick G249451 22.04
323 Gaprindashvili, Nona249357 48.82
324 Jansa, Vlastimil249351 47.25
325 Gligoric, Svetozar249352 67.07
326 Hertneck, Gerald249354 26.44
327 García Gonzáles, Guillermo249252 36.22
328 Ivkov, Borislav249253 56.29
329 Nikolac, Juraj249260 57.85
330 Lukacs, Peter249150 39.64
331 Simic, Radoslav249157 41.72
332 Wedberg, Tom249050 36.26
333 Granda Zuńiga, Julio E248952 23.01
334 Dzuban, Oleg I248965
335 Rubinetti, Jorge A248959 44.91
336 Ree, Hans248954 45.45
337 Tunik, Gennady248856 36.75
338 Davies, Nigel R248849 29.58
339 Makarov, Marat248856 26.81
340 Matulovic, Milan248860 54.72
341 Barlov, Dragan248850 33.08
342 Barbulescu, Dan248867 25.68
343 Dimitrov, Vladimir248756 21.88
344 Mochalov, Evgeny V248671 38.33
345 Antunes, Antonio248654 28.06
346 Piskov, Yury248655 28.38
347 Lein, Anatoly248654 58.91
348 Rechlis, Gad248654 23.06
349 Gutman, Lev248650 44.42
350 Klundt, Klaus248561 48.18
351 Blatny, Pavel248549 21.68
352 Filipenko, Alexander V248570 40.98
353 Meister, Yakov248458 34.46
354 Motwani, Paul248356 27.71
355 Ornstein, Axel248362 37.84
356 Rajkovic, Dusan248352 47.70
357 Schmittdiel, Eckhard248350 29.79
358 Rivas Pastor, Manuel248253 29.62
359 Sznapik, Aleksander248250 39.05
360 Ekstroem, Roland248257 33.77
361 Ionescu, Constantin248255 31.46
362 Klinger, Josef248250 22.73
363 Stanojevic, Branko248273 47.15
364 Drasko, Milan248150 27.23
365 Norwood, David248155 21.40
366 Kantsler, Boris248156 27.87
367 Saltaev, Mihail248165 27.28
368 Zilberman, Nathan R248058 49.82
369 Arkell, Keith C248052 29.14
370 Strikovic, Aleksa248052 28.79
371 Andrianov, Nikolai248072 28.19
372 Plaskett, Jim248053 29.94
373 Novik, Maxim248069 26.21
374 Ledger, Andrew248065 20.76
375 Brooks, Michael A248062 28.86
376 Ziatdinov, Raset247970 31.17
377 Kolev, Atanas247956 22.62
378 Skembris, Spyridon247951 32.02
379 Mascarinas, Rico247855 36.98
380 Schussler, Harry247851 32.68
381 Bronstein, David I247754 66.03
382 Khasin, Alexander247760 38.83
383 Varavin, Viktor247767 22.76
384 Pekarek, Ales247754 28.20
385 Lutz, Christopher247754 19.01
386 Averbakh, Yury L247670 68.05
387 Trapl, Jindrich247669 47.92
388 Tabatadze, Tamaz247668 21.91
389 Flear, Glenn C247649 31.04
390 Wang Zili247560 21.71
391 Hazai, Laszlo247553 36.71
392 Byrne, Robert E247559 61.86
393 Abramovic, Boško247550 39.04
394 Brunner, Lucas247449 22.75
395 Sideif Sade, Fikret I247464 38.16
396 Popchev, Milko247453 25.30
397 Howell, James C247353 22.78
398 Dizdarevic, Emir247351 31.90
399 Levitt, Jonathan247351 26.73
400 Nikolenko, Oleg247363 30.69
401 Kogan, Boris247371
402 Bruk, Ofer247255 22.12
403 Lombardy, William J247273 52.23
404 Kouatly, Bachar247252 31.98
405 Lima, Darcy247160 27.77
406 Seret, Jean Luc247161
407 Kharlov, Andrei247068 21.27
408 Mirkovic, Slobodan246965 31.58
409 Kuczynski, Robert246949 23.86
410 Szekely, Peter246954 35.05
411 Mednis, Edmar J246953 52.93
412 Ikonnikov, Vyacheslav246966 23.95
413 Nemet, Ivan246855 46.87
414 Padevsky, Nikola B246860 56.75
415 Reshevsky, Samuel H246859 78.26
416 Mortensen, Erling246851 34.90
417 Gurevich, Vladimir246860 30.57
418 Finegold, Benjamin246857 20.48
419 Marangunic, Srdjan246869 46.33
420 Zlotnik, Boris A246762 43.37
421 Titov, German246759 26.84
422 Sadler, Matthew246757 15.79
423 Gurgenidze, Bukhuti I246761 56.29
424 Knezevic, Milorad246756 53.33
425 Zilberstein, Valery I246671 46.87
426 Kozlov, V.246665
427 Raicevic, Momcilo246660
428 Hausner, Ivan246654 37.87
429 Schmidt, Wlodzimierz246650 46.88
430 Dueball, Juergen246572 44.91
431 Efimov, Igor246463 29.45
432 Pytel, Krzysztof246460 44.79
433 Polgar, Judit246451 13.60
434 Atalik, Suat246476 25.38
435 Rogulj, Branko246367 38.57
436 Reeh, Oliver246356 26.11
437 Cabrilo, Goran246351 31.66
438 Braga, Fernando246357 31.64
439 Fominyh, Alexander246265 30.70
440 Zhelnin, Vladimir V246261 42.95
441 Lendwai, Reinhard246160 23.37
442 Moldobaev, Emelbek246161
443 Prandstetter, Eduard246053 41.20
444 Staniszewski, Piotr246057 23.48
445 Haba, Petr246051 25.14
446 Yailjan, M.246066
447 Gdanski, Jacek246053 19.25
448 Gschnitzer, Oswald246059 24.05
449 Zelcic, Robert245968 24.44
450 Avshalumov, Alex245956 25.98
451 Gonzalez, JA.245973
452 Yuferov, Sergey N245963 44.23
453 Negulescu, Adrian245963 28.72
454 Tempone, Marcelo245956 27.48
455 Pichler, Juergen245959 28.73
456 Lukov, Valentin245855 34.21
457 Ostermeyer, Peter245863 46.38
458 Filipovic, Branko245858 32.39
459 Nijboer, Friso245852 24.76
460 Horváth, Csaba245751 21.73
461 Beshukov, Sergei245771 18.91
462 Renman, Nils Gustaf245764
463 Levin, Felix245760 31.31
464 Kraidman, Yair245764 57.32
465 Rukavina, Josip245762 47.25
466 Tringov, Georgy P245761 52.97
467 Dutreeuw, Marc245660 30.02
468 Campos, Jose Felix245665 24.01
469 Thorsteins, Karl245653 25.37
470 Martin del Campo, Roberto245557
471 Ernst, Thomas245550 29.53
472 Temirbaev, Serik245561
473 Cifuentes Parada, Roberto245556 32.19
474 Krnic, Zdenko245564 42.40
475 Zhidkov, Valery S245564 50.48
476 Ioseliani, Nana245557 28.04
477 Casper, Thomas245462 30.94
478 Kuijf, Marinus245451 30.04
479 Akhmilovskaya, Elena245461
480 Karolyi, Tibor Jr245454 28.29
481 Legky, Nikolay A245455 34.88
482 Brestian, Egon245454 25.58
483 Murshed, Niaz245457 23.79
484 Ardiansyah, Haji245372 38.23
485 Mukhametov, Eldar245369 20.77
486 Mohr, Georg245355 25.07
487 Shmuter, Leonid245370 20.82
488 Gallagher, Joseph G245250 25.82
489 Atlas, Valeri245274 21.87
490 Mohr, Stefan245249 22.35
491 Gomez Baillo, Jorge H245259 30.86
492 Bergstrom, Christer245262 31.42
493 Godena, Michele245165 22.66
494 Pribyl, Josef245153 42.38
495 Velikov, Petar245152 38.91
496 Ilincic, Zlatko245151 21.80
497 Vokác, Marek245053 31.23
498 Vilela, Jose Luis245058 36.94
499 Graf, Juergen245058 26.91
500 Grivas, Efstratios244954 23.91

These ratings, calculated as of February 28, 1990, incorporate all games (against rated opponents) played in the time between March 1, 1989 and February 28, 1990, along with the ratings that were already calculated as of February 28, 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 February 28, 1990. This represents the player's estimated strength on March 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 March 1, 1990. The +/- value represents the standard deviation of that estimate; the player's true strength on March 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 March 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 February 28, 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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