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Top 10 active players as of February 28, 1981


Top 500 active players as of February 28, 1981

  #  

Player Rating +/- Best? 75%? Age
1 Karpov, Anatoly E27914850.4% #329.76
2 Korchnoi, Viktor L27555019.5% #649.93
3 Kasparov, Garry K27335210.8% #1117.87
4 Polugaevsky, Lev A2702503.2% #2046.27
5 Beliavsky, Alexander G2692492.0% #2327.20
6 Timman, Jan H2690471.4% #2429.21
7 Portisch, Lajos2690491.6% #2443.90
8 Spassky, Boris V2677501.1% #3144.08
9 Tal, Mikhail2675490.8% #3244.30
10 Hübner, Robert2674500.8% #3232.31
11 Romanishin, Oleg M2670490.7% #3429.13
12 Jussupow, Artur M2662520.6% #3921.04
13 Psakhis, Lev B2662571.0% #4222.25
14 Petrosian, Tigran V2659510.4% #4051.70
15 Andersson, Ulf2658470.3% #4029.67
16 Balashov, Yury S2655490.3% #4231.95
17 Sosonko, Gennadi2652490.2% #4437.78
18 Larsen, Bent2649480.2% #4645.98
19 Ribli, Zoltán2643500.2% #5129.48
20 Dolmatov, Sergey V2641520.2% #5322.02
21 Tseshkovsky, Vitaly V2639490.1% #5336.43
22 Gulko, Boris F2639580.4% #5834.05
23 Vasiukov, Evgeny A2638550.3% #5747.97
24 Hort, Vlastimil2638480.1% #5437.13
25 Ljubojevic, Ljubomir2637490.1% #5430.32
26 Smyslov, Vassily V2631530.2% #6159.92
27 Sveshnikov, Evgeny E2627500.1% #6231.05
28 Miles, Anthony J262748 #6225.85
29 Kupreichik, Viktor D2625540.1% #6531.65
30 Vaganian, Rafael A262549 #6329.37
31 Kuzmin, Gennady P2625510.1% #6435.11
32 Gufeld, Eduard E2624550.1% #6744.94
33 Geller, Efim P262151 #6755.98
34 Gheorghiu, Florin262049 #6836.89
35 Lerner, Konstantin Z2620560.1% #7230.99
36 Dzindzichashvili, Roman Y2619560.1% #7236.81
37 Mikhalchishin, Adrian B2617560.1% #7426.28
38 Kholmov, Ratmir D2614620.2% #7955.79
39 Ivanov, Igor V2614670.3% #8334.14
40 Rashkovsky, Nukhim N261152 #7734.86
41 Dorfman, Iosif D260854 #7928.82
42 Panchenko, Alexander N2607540.1% #8127.40
43 Sax, Gyula260550 #8029.69
44 Savon, Vladimir A2604570.1% #8540.42
45 Bagirov, Vladimir K2599580.1% #9144.53
46 Eingorn, Viacheslav S2598600.1% #9324.26
47 Parma, Bruno259656 #9339.16
48 Kavalek, Lubomir259550 #9037.55
49 Alburt, Lev O259452 #9135.52
50 Dvoretsky, Mark I2593740.3% #10733.22
51 Kochiev, Alexander259259 #9824.92
52 Makarichev, Sergey Y259254 #9427.28
53 Gipslis, Aivars2591650.1% #10244.05
54 Petrosian, Arshak B258860 #10127.20
55 Chernin, Alexander M2588690.2% #10820.97
56 Taimanov, Mark E258657 #10255.06
57 Christiansen, Larry M258651 #9924.67
58 Georgadze, Tamaz V258453 #10233.30
59 Ivkov, Borislav258350 #10147.29
60 Unzicker, Wolfgang258155 #10655.67
61 Kurajica, Bojan257954 #10633.29
62 Adorján, András257951 #10530.91
63 Palatnik, Semen A2578710.1% #11830.92
64 Gligoric, Svetozar257751 #10658.07
65 Bronstein, David I257561 #11557.03
66 Razuvaev, Yury S257452 #10935.38
67 Kharitonov, Andrey Y257459 #11521.90
68 Tarjan, James E257357 #11529.02
69 Smejkal, Jan257350 #11134.93
70 Browne, Walter S257049 #11132.13
71 Liberzon, Vladimir M256952 #11443.93
72 Nunn, John D M256351 #11925.84
73 Tukmakov, Vladimir B256352 #12134.95
74 Szabó, László2562710.1% #13463.94
75 Kapengut, Albert Z256166 #13136.65
76 Darga, Klaus V256068 #13247.01
77 Seirawan, Yasser256052 #12420.92
78 Tseitlin, Mikhail S255956 #12733.70
79 Gruenfeld, Yehuda255958 #12924.99
80 Torre, Eugenio255749 #12429.32
81 Panno, Oscar R255652 #12745.94
82 Najdorf, Miguel255655 #12970.87
83 Olafsson, Fridrik255456 #13146.09
84 Antoshin, Vladimir S255367 #13951.79
85 Didishko, Vereslav2553730.1% #14331.88
86 Ftácnik, Lubomír255252 #13023.33
87 Tringov, Georgy P255258 #13443.97
88 Magerramov, Elmar S255264 #13822.88
89 Evans, Larry M255159 #13648.93
90 Lein, Anatoly255152 #13249.91
91 Knaak, Rainer F254950 #13227.94
92 Byrne, Robert E254953 #13452.86
93 Timoshchenko, Gennady254860 #13931.84
94 Lombardy, William J254760 #13943.23
95 Matanovic, Aleksandar254559 #14150.76
96 Kovacevic, Vladimir254562 #14338.92
97 Vitolinš, Alvis254459 #14234.70
98 Quinteros, Miguel A254450 #13733.17
99 Speelman, Jonathan S254351 #13824.40
100 Filip, Miroslav254367 #14852.34
101 Ubilava, Elizbar E254370 30.50
102 Faragó, Iván254150 34.91
103 Gurgenidze, Bukhuti I254171 47.29
104 Bukic, Enver254057 43.24
105 Csom, István253951 40.74
106 Uhlmann, Wolfgang253951 45.91
107 Stean, Michael F253751 27.48
108 Nikolac, Juraj253359 48.85
109 Nei, Iivo253372 49.33
110 Pfleger, Helmut253160 37.56
111 Grigorian, Karen A253156 33.47
112 Ree, Hans253050 36.45
113 Matulovic, Milan252863 45.72
114 Shamkovich, Leonid A252752 57.74
115 Kaplan, Julio P252761 30.59
116 Rogoff, Kenneth S252661 27.93
117 Yurtaev, Leonid252270 21.82
118 Gavrikov, Victor N252264 23.58
119 Ivanov, Alexander V252158 24.82
120 Chekhov, Valery A252158 25.25
121 Knezevic, Milorad252053 44.33
122 Peresipkin, Vladimir252074
123 Klovans, Janis251962 45.89
124 Reshevsky, Samuel H251860 69.26
125 van der Wiel, John T H251751 21.55
126 Vogt, Lothar H251750 29.11
127 Cebalo, Mišo251660 36.06
128 Velimirovic, Dragoljub251653 38.79
129 Murey, Yakov251569 39.57
130 Nemet, Ivan251559 37.87
131 Simic, Radoslav251462 32.72
132 Keene, Raymond251354
133 Anikaev, Yury251365 32.66
134 Shereshevsky, Mikhail I251373 30.85
135 Moiseev, Oleg L251271 55.81
136 Stoica, Valentin251061 31.04
137 Lputian, Smbat G251054 23.04
138 Zaitsev, Igor A251056 42.75
139 Suetin, Alexey S250955 54.28
140 Marjanovic, Slavoljub250953 26.14
141 Díez del Corral, Jesús250862 47.89
142 Vukic, Milan250856 37.53
143 Weinstein, Norman250870 30.40
144 Tatai, Stefano250857 42.93
145 Lukin, Andrei M250872 32.50
146 Suba, Mihai250854 33.74
147 Mnatsakanian, Eduard A250859 42.23
148 Malich, Burkhard G250760 44.25
149 Pachmann, Ludek250760 56.80
150 Popov, Luben250757 45.08
151 Espig, Lutz250652 32.15
152 Benko, Pal C250659 52.62
153 Schmidt, Wlodzimierz250551 37.88
154 Pintér, József250454 27.30
155 Agzamov, Georgy T250460 26.48
156 Donner, Johannes H250357 53.64
157 Bleiman, Yaacov250272 33.47
158 Biyiasas, Peter250154 30.28
159 Georgiev, Krum249860 22.76
160 Zaltsman, Vitaly F249756 39.34
161 Langeweg, Kick249652 43.97
162 Popovic, Petar249555 22.04
163 Bilek, István249367 48.55
164 Padevsky, Nikola B249364 47.75
165 Peters, John A249254 30.05
166 Grefe, John A249263 33.48
167 Ghinda, Mihail Viorel249255 31.59
168 Lukacs, Peter249251 30.64
169 Barczay, Laszlo249253 45.02
170 Radulov, Ivan249154 42.14
171 Hulak, Krunoslav249159 29.76
172 Sigurjónsson, Gudmundur249155 33.43
173 Kraidman, Yair249071 48.32
174 Jansson, Borje249076 38.95
175 Vaisser, Anatoli248971 31.97
176 Řgaard, Leif248963 29.15
177 Marangunic, Srdjan248869 37.33
178 Ermenkov, Evgenij248852 31.41
179 Sunye Neto, Jaime248652 23.82
180 Rukavina, Josip248664 38.25
181 Zuckerman, Bernard248673 37.91
182 Lutikov, Anatoly S248566 48.06
183 Ivanovic, Božidar248553 34.51
184 Inkiov, Ventzislav248555 24.78
185 Plachetka, Jan248550 36.03
186 Lechtynsky, Jiri248455 33.26
187 Sturua, Zurab248463 21.72
188 Gutman, Lev248368 35.42
189 Mednis, Edmar J248257 43.93
190 Robatsch, Karl248260 52.37
191 Spassov, Liuben247950 37.93
192 Rogulj, Branko247858 29.57
193 Petkevich, Jusefs247771 40.19
194 Petrushin, Alexander I247760 33.96
195 Ornstein, Axel247756 28.84
196 Platonov, Igor V247662 47.11
197 Vladimirov, Evgeny Y247675 24.11
198 Forintos, Gyözö V247461 45.58
199 Ligterink, Gert247451 31.28
200 Hazai, Laszlo247458 27.71
201 Birnboim, Nathan247366 30.25
202 Bönsch, Uwe247352 22.37
203 Minic, Dragoljub247372 43.97
204 Gaprindashvili, Nona247166 39.82
205 Marovic, Dražen247063 43.12
206 Soltis, Andrew E247066 33.75
207 Schneider, Lars Ake247055
208 Cámpora, Daniel H247065 23.66
209 Regan, Kenneth246965 21.46
210 Ambroz, Jan246957 26.69
211 Nikolic, Zivoslav246870 27.21
212 Mestel, A Jonathan246852 23.95
213 Wedberg, Tom246856 27.26
214 Zapata, Alonso246760 22.52
215 Makropoulos, Georgios246658 27.42
216 Vokác, Marek246659 22.23
217 Diesen, Mark C246662
218 Commons, Kim S246676 29.60
219 Vranesic, Zvonko246574 42.40
220 Piasetski, Leon David246570
221 Kuligowski, Adam246452 25.18
222 Sahovic, Dragutin246358 40.55
223 Kaufman, Larry C246366 33.29
224 Kirov Ivanov, Nino246351 35.47
225 Hartston, William R246257 33.54
226 Qi Jingxuan246166 33.30
227 Van Wijgerden, Cornelis246158 30.76
228 Djuric, Stefan246161 25.59
229 Bisguier, Arthur B246059 51.39
230 Mariotti, Sergio246057 34.55
231 Ciocaltea, Victor246055 49.12
232 Meduna, Eduard246055 30.46
233 Wittmann, Walter246061 32.95
234 Jelen, Iztok245968 34.11
235 Karlsson, Lars245953 25.63
236 Rodriguez, Amador245959 24.47
237 Bradford, Joseph M245862 30.32
238 Rajkovic, Dusan245857 38.70
239 Hecht, Hans-Joachim245862 42.08
240 Lengyel, Levente245858 47.71
241 Portisch, Ferenc245758 41.89
242 Damjanovic, Mato245763 53.93
243 Szmetan, Jorge245559 30.76
244 Jansa, Vlastimil245351 38.25
245 Schweber, Samuel245360 44.62
246 Ekstroem, Roland245373 24.77
247 Chandler, Murray G245351 20.90
248 Duer, Arne245359 21.63
249 Ghitescu, Theodor245356 47.09
250 Musil, Vojko245375 35.53
251 García Gonzáles, Guillermo245354 27.22
252 Garcia, Raimundo245275 44.75
253 Garcia, Gildardo245262 26.96
254 Hernandez, Roman245159 31.26
255 Podzielny, Karl Heinz245162 26.47
256 Ungureanu, Emil245170 44.32
257 Myagmarsuren, Lhamsuren245175 43.03
258 Szekely, Peter245062 26.05
259 Hamann, Svend245068 40.39
260 Castro Rojas, Oscar Humberto245061 27.80
261 Planinc, Albin244962 36.86
262 Hausner, Ivan244958 28.87
263 Prandstetter, Eduard244953 32.20
264 Velikov, Petar244857 29.91
265 Mochalov, Evgeny V244668 29.33
266 Zaichik, Gennady L244667 24.05
267 Lederman, Leon244671 33.76
268 Plaskett, Jim244663 20.94
269 Luczak, Andrzej244551 32.23
270 Feustel, Bernd244472 26.44
271 Taulbut, Shaun M244358 23.13
272 Chiburdanidze, Maia G244356 20.11
273 Velickovic, Sasa244368 29.91
274 Strauss, David J244266 34.56
275 Azmaiparashvili, Zurab A244273 20.94
276 Hug, Werner244158 28.47
277 Sisniega, Marcel243965 21.58
278 Raicevic, Vladimir243957 31.82
279 Zichichi, Alvise243860 42.65
280 Lengyel, Laszlo243875 36.63
281 Hoelzl, Franz243856 34.89
282 Cramling, Dan243860 22.06
283 Arnason, Jon L243752 20.29
284 Joksic, Sinisa243670 40.38
285 Honfi, Karoly243672 50.34
286 Vadasz, Laszlo243553 33.09
287 Borik, Otto243562 33.43
288 Bohm, Hans243451 31.12
289 Ostermeyer, Peter243469 37.38
290 Groszpeter, Attila243455 20.72
291 Trapl, Jindrich243463 38.92
292 Debarnot, Roberto243365 33.56
293 Rodriguez Vargas, Orestes243360 37.65
294 Spiridonov, Nikola243254 42.99
295 Burger, Karl243266 48.10
296 Jakobsen, Ole243256 38.36
297 Pomar Salamanca, Arturo243167 49.49
298 Westerinen, Heikki MJ243054 36.84
299 deFirmian, Nicholas E243060 23.59
300 Kestler, Hans-Günter243071 41.21
301 Taruffi, Daniele243067 22.48
302 Hennings, Artur243062 40.63
303 Rodriguez, Ruben242968 34.22
304 Matera, Salvatore Joseph242964
305 Sideif Sade, Fikret I242860 29.16
306 Schussler, Harry242854 23.68
307 Ostojic, Predrag242767 43.02
308 Pavlov, Mircea242762 43.46
309 Adamski, Jan242752 37.30
310 Lakic, Nikola242767 33.62
311 Pytel, Krzysztof242758 35.79
312 Rath, Ulrik242769 34.18
313 Liebert, Heinz242674 44.76
314 Pribyl, Josef242653 33.38
315 Klaric, Zlatko242562 24.34
316 Fedorowicz, John P242456 22.42
317 Haik, Aldo242460 28.36
318 Sydor, Andrzej242468 44.15
319 Rohde, Michael A242473 21.51
320 Pétursson, Margeir242455 21.04
321 Jamieson, Robert Murray242367
322 Minev, Nikolay N242271 50.14
323 Gruenberg, Hans Ulrich242255 25.14
324 Garcia Martinez, Silvino242257 36.65
325 Bielczyk, Jacek242255 28.01
326 Franco Ocampos, Zenon242162 24.79
327 Ioseliani, Nana242163 19.04
328 Svensson, Bengt242174 20.64
329 Botterill, George Steven242163
330 Lobron, Eric242060 20.81
331 Hebert, Jean241958 23.30
332 Kuijpers, Franciscus Antonius241772
333 Despotovic, Momcilo241768 32.98
334 Bellin, Robert241753 28.66
335 Krnic, Zdenko241766 33.40
336 Wirthensohn, Heinz241766 29.82
337 Hase, Juan Carlos241665
338 Nikolic, Predrag241663 20.46
339 Wockenfuss, Klaus241668 29.50
340 Ciric, Dragoljub M241667 45.29
341 Trifunov, Dimitar241568 17.14
342 Gerusel, Mathias241565 43.06
343 Balinas, Rosendo Carrean241565
344 Toth, Bela241459 37.86
345 Webb, Simon241366 31.72
346 Augustin, Josef241357 38.78
347 Rubinetti, Jorge A241359 35.91
348 Rantanen, Yrjo A241361 30.85
349 Doda, Zbigniew241265 50.02
350 Vilela, Jose Luis241253 27.94
351 Kristiansen, Jens241256 28.76
352 Nun, Jiri241162 23.59
353 Law, Andrew P240963 30.64
354 Hansson, Dan240969 28.72
355 Cvetkovic, Srdjan240969 34.99
356 Renman, Nils Gustaf240962
357 Rocha, Antonio240972 36.71
358 Welin, Thomas240864 21.48
359 Harandi, Khosro240867 30.49
360 Clemens, Christian240866 40.56
361 Brinck Claussen, Bjorn240857
362 Van der Sterren, Paul240752 24.94
363 Pritchett, Craig William240765
364 Watson, John L240769 29.48
365 Moehring, Guenther240556 44.26
366 Tompa, Janos240560 33.83
367 Sznapik, Aleksander240451 30.05
368 Bukal, Vladimir Sr240466 41.32
369 Kunsztowicz, Uwe240471 37.11
370 Barle, Janez240461 28.93
371 Enklaar, Bertus F240362
372 Henley, Ron W240264 24.23
373 Iskov, Gert240257 32.58
374 Tomaszewski, Roman240258 20.78
375 Swic, Waldemar240059 27.96
376 Pokojowczyk, Jerzy239953 32.02
377 Vera, Reynaldo239973 20.14
378 Emma, Jaime J239863 43.11
379 Szymczak, Zbigniew239758 29.15
380 Van Riemsdijk, Herman C239758 32.51
381 Filipowicz, Andrzej239663 42.79
382 Franklin, Michael J239666 50.07
383 Goodman, David SC239668
384 Bouaziz, Slim239563 30.87
385 Spraggett, Kevin B239570 26.30
386 Martinovic, Slobodan239559 35.59
387 Przewoznik, Jan239557 23.45
388 De Savornin Lohman, A.239469
389 Horvath, Tamas239462 29.35
390 Vetemaa, Juri239475 24.51
391 Vinje Gulbrandsen, Arne239475
392 Bednarski, Jacek B239460 41.95
393 Lau, Ralf239466 21.36
394 Sloth, Jorn239362 36.48
395 Dueckstein, Andreas239267 53.57
396 Littlewood, Paul E239258 25.11
397 Bohosjan, Sarkis239268 39.91
398 Fedder, Steen239263 29.71
399 Radev, Nikolai239161 42.19
400 Rakic, Tomislav239163 46.30
401 Bronstein, Luis239161 34.74
402 De Bruycker, Bernard239170 39.70
403 Janoševic, Dragoljub239065 57.64
404 Gruchacz, Robert238965 27.25
405 Danailov, Silvio238967 19.85
406 Morris, Walter D238761 22.49
407 Hoi, Carsten238758 24.12
408 Lombard, Andre238675 30.44
409 Benjamin, Joel L238663 16.96
410 Tischbierek, Raj238659 18.43
411 Ravikumar, Vaidyanathan238558 21.17
412 Adamski, Andrzej238564 42.12
413 Schoeneberg, Manfred238468 34.64
414 Olafsson, Helgi238358 24.54
415 Garcia Palermo, Carlos238365 27.24
416 Helmers, Knut J238364 24.06
417 Odendahl, Steven M238261 21.34
418 Peev, Peicho Chonev238275 40.90
419 Banas, Jan238255 33.73
420 Hansen, Curt238261 16.44
421 Mortensen, Erling238256 25.90
422 Borm, Franciscus WM238162
423 Bator, Zbigniew238171 29.23
424 Yermolinsky, Alex V238173 22.88
425 Cuartas, Carlos238162 40.54
426 Segal, Alexandru Sorin238061 33.40
427 Jacobsen, Bo238074 32.21
428 Skrobek, Ryszard237957 29.65
429 Flear, Glenn C237967 22.04
430 Sibarevic, Milenko237969 35.95
431 Kagan, Shimon237858 38.89
432 Bergstrom, Christer237771 22.42
433 Cappello, Renato237771
434 Rumens, David E237767 41.43
435 Bellon Lopez, Juan Manuel237755 30.80
436 Visier Segovia, Fernando237676 38.07
437 Danner, Georg237356 34.34
438 Gauglitz, Gernot237362 18.67
439 Lukov, Valentin237259 25.21
440 Nicevski, Risto237256 35.67
441 Mascarinas, Rico237267 27.98
442 Cuasnicu, Oscar237175 38.34
443 Hartoch, Robert G237159
444 Budde, Vladimir237065 28.18
445 Biriescu, Ioan237069 27.34
446 Kaiszauri, Konstanty236960 28.34
447 Neckar, Lubomir236860 30.57
448 Basman, Michael J236867 34.94
449 Jamroz, Zbigniew236671 46.71
450 Watzka, Horst236674 42.46
451 Meyer, E.236675
452 Hess, Ralf236562 36.91
453 Dobosz, Henryk236552 27.93
454 Andres Mendez, Miguel236470
455 Kindermann, Stefan236467 21.17
456 Gonsior, Evzen236464 49.23
457 Rossetto, Héctor D236474 58.47
458 Kojder, Konrad236358 25.12
459 Short, Nigel D236157 15.74
460 Cording, Harm236164 44.14
461 Fuller, Maxwell L236056 36.08
462 Fries Nielsen, Jens Ove236054 21.01
463 Bernard, Ryszard235959 36.52
464 Balcerowski, Witold235975 45.55
465 Niklasson, Christer235863 28.15
466 Hebden, Mark235863 23.04
467 Sapi, Laszlo235862 45.93
468 Whiteley, Andrew J235874 33.72
469 Goehring, Karl Heinz235871
470 Van der Vliet, Fredrik235759
471 Coudari, Camille235774 29.58
472 Schinzel, Wladyslaw235752 37.77
473 Rigo, Janos235658 32.33
474 Giffard, Nicolas235668 30.40
475 Szilágyi, György235666 59.65
476 Zarubin, O.235576
477 Root, Douglas235566 18.04
478 Sikora Lerch, Jan235559
479 Wagman, Stuart235470 61.79
480 Braga, Fernando235466 22.64
481 Nogueiras, Jesus235267 21.61
482 Angantysson, Haukur235268 32.24
483 Donchev, Dimitar I235268 22.60
484 Balshan, Amikam235268
485 Trois, Francisco RT235154
486 Giardelli, Sergio C235158 25.67
487 Paehtz, Thomas Sr235159 24.48
488 Ionescu, Constantin235067 22.46
489 Holm, Sejer235065 41.55
490 Herzog, Adolf235063 27.73
491 Kristensen, Bjarke234958 24.89
492 Povah, Nigel E234961 28.61
493 Rajna, George234863 34.04
494 Day, Lawrence A234862 32.07
495 Nowak, Ignacy234775 32.13
496 Maciejewski, Andrzej234771 29.64
497 Brondum, Eric234762 39.20
498 Barreras, Alberto234773 29.90
499 Petran, Pal234660 34.45
500 Lebredo, Gerardo234469 30.57

These ratings, calculated as of February 28, 1981, incorporate all games (against rated opponents) played in the time between March 1, 1980 and February 28, 1981, along with the ratings that were already calculated as of February 29, 1980. 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, 1981. This represents the player's estimated strength on March 1, 1981.

+/- 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, 1981. The +/- value represents the standard deviation of that estimate; the player's true strength on March 1, 1981 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, 1981. 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, 1981. 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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