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Top 10 active players as of September 30, 1980

  #  

Player Rating +/-
1 Karpov, Anatoly E281149
2 Korchnoi, Viktor L275949
3 Polugaevsky, Lev A271949
4 Portisch, Lajos271149
5 Kasparov, Garry K270652
6 Spassky, Boris V269649
7 Tal, Mikhail269048
8 Geller, Efim P268951
9 Timman, Jan H268647
10 Beliavsky, Alexander G267949

About these ratings

Top 500 active players as of September 30, 1980

  #  

Player Rating +/- Best? 75%? Age
1 Karpov, Anatoly E28114961.7% #229.35
2 Korchnoi, Viktor L27594916.1% #749.52
3 Polugaevsky, Lev A2719493.9% #1545.86
4 Portisch, Lajos2711493.0% #1843.49
5 Kasparov, Garry K2706522.8% #2017.46
6 Spassky, Boris V2696491.5% #2443.67
7 Tal, Mikhail2690481.1% #2743.89
8 Geller, Efim P2689511.3% #2855.58
9 Timman, Jan H2686470.8% #2828.79
10 Beliavsky, Alexander G2679490.7% #3226.79
11 Petrosian, Tigran V2679490.7% #3251.29
12 Romanishin, Oleg M2674480.5% #3428.72
13 Hübner, Robert2670490.4% #3831.90
14 Balashov, Yury S2666500.4% #4031.55
15 Mecking, Henrique2658701.6% #5528.69
16 Andersson, Ulf2654480.2% #4729.26
17 Miles, Anthony J2648470.1% #5125.44
18 Larsen, Bent2647480.1% #5245.57
19 Hort, Vlastimil2644480.1% #5436.72
20 Gufeld, Eduard E2640550.2% #6144.53
21 Jussupow, Artur M2639520.1% #6120.63
22 Ribli, Zoltán2639500.1% #5929.06
23 Dolmatov, Sergey V2636520.1% #6321.61
24 Vaganian, Rafael A263649 #6128.95
25 Gulko, Boris F2635550.1% #6633.64
26 Tseshkovsky, Vitaly V263549 #6236.01
27 Lerner, Konstantin Z2634540.1% #6530.59
28 Vasiukov, Evgeny A2632580.2% #6947.57
29 Sosonko, Gennadi262949 #6737.37
30 Gheorghiu, Florin2628490.1% #6736.48
31 Kholmov, Ratmir D2627570.1% #7355.38
32 Ljubojevic, Ljubomir262749 #6929.91
33 Psakhis, Lev B2626610.2% #7621.84
34 Mikhalchishin, Adrian B262352 #7425.87
35 Sveshnikov, Evgeny E262250 #7330.63
36 Kuzmin, Gennady P262151 #7534.70
37 Savon, Vladimir A2619560.1% #7940.01
38 Makarichev, Sergey Y261752 #8026.87
39 Dzindzichashvili, Roman Y261653 #8136.40
40 Browne, Walter S261550 #7931.72
41 Panchenko, Alexander N261354 #8326.98
42 Rashkovsky, Nukhim N261252 #8334.45
43 Sax, Gyula261249 #8229.28
44 Palatnik, Semen A2611660.2% #9430.51
45 Georgadze, Tamaz V260952 #8632.89
46 Dvoretsky, Mark I2608680.2% #9732.81
47 Unzicker, Wolfgang260855 #8855.26
48 Kupreichik, Viktor D260853 #8831.24
49 Dorfman, Iosif D260752 #8728.41
50 Razuvaev, Yury S260751 #8734.96
51 Kochiev, Alexander260655 #9024.51
52 Parma, Bruno260657 #9238.75
53 Ivanov, Igor V2606710.2% #10133.73
54 Smyslov, Vassily V260551 #8959.52
55 Ivkov, Borislav260549 #8846.88
56 Bagirov, Vladimir K260454 #9144.12
57 Eingorn, Viacheslav S260259 #9723.85
58 Gipslis, Aivars2601640.1% #10243.64
59 Kurajica, Bojan260153 #9432.87
60 Kavalek, Lubomir259951 #9437.14
61 Alburt, Lev O259852 #9635.11
62 Tarjan, James E259255 #10428.61
63 Smejkal, Jan259149 #10034.52
64 Adorján, András258950 #10330.50
65 Nunn, John D M258951 #10325.43
66 Liberzon, Vladimir M258852 #10643.52
67 Bronstein, David I258857 #11056.61
68 Seirawan, Yasser258551 #10720.52
69 Gligoric, Svetozar258550 #10757.66
70 Evans, Larry M258263 #11848.52
71 Taimanov, Mark E258259 #11654.65
72 Vitolinš, Alvis258058 #11734.29
73 Olafsson, Fridrik257958 #11845.68
74 Szabó, László257864 #12363.53
75 Ubilava, Elizbar E257566 #12730.09
76 Petrosian, Arshak B257359 #12426.79
77 Tukmakov, Vladimir B257151 #12134.54
78 Panno, Oscar R257052 #12245.54
79 Ftácnik, Lubomír256951 #12322.91
80 Matanovic, Aleksandar256863 #13150.35
81 Pfleger, Helmut256660 #13237.15
82 Nemet, Ivan256256 #13337.46
83 Kharitonov, Andrey Y256160 #13621.49
84 Quinteros, Miguel A256051 #13132.76
85 Darga, Klaus V255961 #13846.60
86 Byrne, Robert E255751 #13452.44
87 Pachmann, Ludek255659 #14056.38
88 Stean, Michael F255549 #13527.07
89 Tseitlin, Mikhail S255556 #13933.29
90 Kapengut, Albert Z255566 #14536.24
91 Timoshchenko, Gennady255456 #14031.42
92 Lombardy, William J255356 #14142.82
93 Antoshin, Vladimir S255260 #14451.38
94 Lein, Anatoly255251 #13949.51
95 Speelman, Jonathan S255251 #13823.99
96 Matulovic, Milan255261 #14545.30
97 Tringov, Georgy P255159 #14543.56
98 Grigorian, Karen A255054 #14233.06
99 Faragó, Iván255049 #14034.49
100 Filip, Miroslav254968 #15151.92
101 Chekhov, Valery A254668 24.84
102 Torre, Eugenio254550 28.90
103 Veingold, Aleksander254368 26.96
104 Shamkovich, Leonid A254351 57.33
105 Bukic, Enver254257 42.83
106 Ree, Hans254249 36.04
107 Ivanov, Alexander V254256 24.41
108 Yurtaev, Leonid254263 21.41
109 Knaak, Rainer F254250 27.54
110 Suetin, Alexey S254256 53.87
111 Kovacevic, Vladimir254156 38.51
112 Nei, Iivo253965 48.91
113 Nikolac, Juraj253956 48.44
114 Uhlmann, Wolfgang253851 45.50
115 Najdorf, Miguel253754 70.46
116 Pintér, József253555 26.89
117 Csom, István253450 40.33
118 Kaplan, Julio P253460 30.18
119 Rogoff, Kenneth S253461 27.52
120 Vukic, Milan253455 37.11
121 Lputian, Smbat G252957 22.63
122 Vogt, Lothar H252949 28.70
123 Díez del Corral, Jesús252964 47.48
124 Chernin, Alexander M252772 20.56
125 Peresipkin, Vladimir252767
126 Zaitsev, Igor A252753 42.34
127 Zaltsman, Vitaly F252657 38.92
128 Reshevsky, Samuel H252660 68.84
129 Schneider, Lars Ake252555
130 Klovans, Janis252561 45.47
131 Keene, Raymond252352
132 van der Wiel, John T H252350 21.14
133 Magerramov, Elmar S252258 22.47
134 Gruenfeld, Yehuda252255 24.59
135 Weinstein, Norman252168 29.98
136 Petrushin, Alexander I252067 33.55
137 Knezevic, Milorad251853 43.91
138 Lukin, Andrei M251871 32.09
139 Marjanovic, Slavoljub251752 25.73
140 Gurgenidze, Bukhuti I251770 46.88
141 Biyiasas, Peter251752 29.86
142 Radulov, Ivan251656 41.73
143 Malich, Burkhard G251659 43.84
144 Christiansen, Larry M251652 24.26
145 Agzamov, Georgy T251561 26.06
146 Lutikov, Anatoly S251564 47.65
147 Kakageldyev, Amanmurad251466 30.76
148 Stoica, Valentin251463 30.62
149 Moiseev, Oleg L251372 55.40
150 Popov, Luben251358 44.67
151 Tatai, Stefano251257 42.52
152 Schmidt, Wlodzimierz251250 37.47
153 Anikaev, Yury251158 32.25
154 Velimirovic, Dragoljub251052 38.38
155 Bleiman, Yaacov251064 33.06
156 Piasetski, Leon David250971
157 Peters, John A250955 29.64
158 Benko, Pal C250859 52.21
159 Vorotnikov, Vladislav V250867 33.12
160 Mnatsakanian, Eduard A250857 41.81
161 Marangunic, Srdjan250767 36.91
162 Vokác, Marek250458 21.81
163 Kraidman, Yair250364 47.91
164 Hecht, Hans-Joachim250366 41.67
165 Barczay, Laszlo250252 44.61
166 Kirov Ivanov, Nino250253 35.06
167 Polovodin, Igor A250168 25.52
168 Donner, Johannes H250157 53.23
169 Sturua, Zurab250165 21.31
170 Luczak, Andrzej250054 31.82
171 García Gonzáles, Guillermo250054 26.81
172 Vladimirov, Evgeny Y250067 23.69
173 Suba, Mihai250053 33.33
174 Jansson, Borje249971 38.55
175 Kuligowski, Adam249952 24.77
176 Rodriguez, Amador249858 24.06
177 Bilek, István249867 48.13
178 Padevsky, Nikola B249759 47.34
179 Ermenkov, Evgenij249653 31.00
180 Sunye Neto, Jaime249653 23.41
181 Wedberg, Tom249554 26.84
182 Ungureanu, Emil249473 43.91
183 Ghinda, Mihail Viorel249455 31.18
184 Lukacs, Peter249352 30.22
185 Makropoulos, Georgios249360 27.01
186 Regan, Kenneth249264 21.05
187 Hulak, Krunoslav249164 29.35
188 Plachetka, Jan249149 35.62
189 Zilberstein, Valery I249069 37.46
190 Zaichik, Gennady L249063 23.63
191 Grefe, John A248865 33.06
192 Minic, Dragoljub248871 43.57
193 Marovic, Dražen248862 42.71
194 Soltis, Andrew E248769 33.34
195 Lechtynsky, Jiri248754 32.85
196 Popovic, Petar248757 21.63
197 Platonov, Igor V248661 46.70
198 Karlsson, Lars248652 25.22
199 Zuckerman, Bernard248472 37.50
200 Hazai, Laszlo248457 27.29
201 Petkevich, Jusefs248470 39.78
202 Řgaard, Leif248462 28.73
203 Commons, Kim S248474 29.19
204 Mednis, Edmar J248355 43.52
205 Langeweg, Kick248353 43.56
206 Sahovic, Dragutin248356 40.14
207 Gaprindashvili, Nona248364 39.41
208 Rogulj, Branko248256 29.16
209 Musil, Vojko248269 35.12
210 Calvo Minguez, Ricardo248174 36.93
211 Ivanovic, Božidar247952 34.10
212 Mariotti, Sergio247958 34.14
213 Ciocaltea, Victor247855 48.70
214 Ornstein, Axel247854 28.43
215 Sigurjónsson, Gudmundur247853 33.01
216 Damjanovic, Mato247660 53.52
217 Forintos, Gyözö V247557 45.17
218 Piesina, Gintautas247475 28.48
219 Diesen, Mark C247461
220 Hartston, William R247355 33.13
221 Portisch, Ferenc247355 41.47
222 Karaklajic, Nikola247270 54.60
223 Bradford, Joseph M247063 29.91
224 Lederman, Leon247068 33.35
225 Spassov, Liuben247051 37.52
226 Hennings, Artur246965 40.22
227 Jelen, Iztok246968 33.70
228 Prandstetter, Eduard246952 31.79
229 Hansson, Dan246969 28.30
230 Espig, Lutz246952 31.73
231 Rytov, Boris246969
232 Karner, Hillar246875 45.17
233 Van Wijgerden, Cornelis246756 30.35
234 Jansa, Vlastimil246651 37.84
235 Szmetan, Jorge246655 30.34
236 Hausner, Ivan246656 28.46
237 Szekely, Peter246660 25.64
238 Borik, Otto246565 33.01
239 Vooremaa, Andres246569 36.20
240 Cebalo, Mišo246572 35.65
241 Inkiov, Ventzislav246556 24.36
242 Ambroz, Jan246557 26.28
243 Ligterink, Gert246550 30.87
244 Hamann, Svend246465 39.97
245 Podzielny, Karl Heinz246463 26.05
246 Bohm, Hans246351 30.71
247 Messing, Hrvoje246373 40.18
248 Hernandez, Roman246357 30.85
249 Kunsztowicz, Uwe246368 36.70
250 Mochalov, Evgeny V246371 28.91
251 Raicevic, Vladimir246257 31.41
252 Bisguier, Arthur B246259 50.97
253 Chiburdanidze, Maia G246154 19.70
254 Schweber, Samuel246159 44.20
255 Lengyel, Levente246054 47.30
256 Vadasz, Laszlo246053 32.67
257 Gutman, Lev246064 35.01
258 Rajkovic, Dusan246057 38.29
259 Robatsch, Karl246058 51.95
260 Jakobsen, Ole245856 37.94
261 Gerusel, Mathias245766 42.65
262 Bönsch, Uwe245753 21.95
263 Gavrikov, Victor N245763 23.17
264 Kaufman, Larry C245666 32.87
265 Krnic, Zdenko245675 32.99
266 Schussler, Harry245553 23.27
267 Adamski, Jan245552 36.88
268 Garcia, Raimundo245466 44.34
269 Hug, Werner245359 28.05
270 Ghitescu, Theodor245255 46.68
271 Westerinen, Heikki MJ245253 36.42
272 Honfi, Karoly245268 49.92
273 Pétursson, Margeir245156 20.62
274 Mestel, A Jonathan245052 23.55
275 Debarnot, Roberto244863 33.15
276 Spiridonov, Nikola244854 42.59
277 Garcia, Gildardo244863 26.56
278 Planinc, Albin244759 36.45
279 Sideif Sade, Fikret I244658 28.74
280 Arnason, Jon L244653 19.88
281 Doda, Zbigniew244564 49.61
282 Rodriguez Vargas, Orestes244560 37.24
283 Cramling, Dan244462 21.65
284 Chandler, Murray G244353 20.49
285 Pomar Salamanca, Arturo244369 49.08
286 Qi Jingxuan244162 32.89
287 Dely, Peter244169 46.23
288 Liebert, Heinz244167 44.35
289 Velikov, Petar244067 29.50
290 Taulbut, Shaun M244058 22.72
291 Zichichi, Alvise243962 42.24
292 Rukavina, Josip243971 37.84
293 Castro Rojas, Oscar Humberto243960 27.39
294 Georgiev, Krum243970 22.35
295 Balinas, Rosendo Carrean243866
296 Ostojic, Predrag243764 42.61
297 Azmaiparashvili, Zurab A243769 20.54
298 Botterill, George Steven243760
299 Haik, Aldo243763 27.94
300 Barle, Janez243762 28.52
301 Pytel, Krzysztof243656 35.37
302 Sydor, Andrzej243662 43.74
303 Cámpora, Daniel H243562 23.25
304 Joksic, Sinisa243363 39.96
305 Rubinetti, Jorge A243356 35.50
306 Klaric, Zlatko243266 23.93
307 Duer, Arne243261 21.22
308 Tompa, Janos243257 33.42
309 Sznapik, Aleksander243151 29.64
310 Wirthensohn, Heinz243063 29.40
311 Matera, Salvatore Joseph243064
312 Pribyl, Josef243052 32.96
313 Bednarski, Jacek B243060 41.55
314 Martinovic, Slobodan242958 35.18
315 Tischbierek, Raj242958 18.02
316 Meduna, Eduard242858 30.05
317 Birnboim, Nathan242865 29.84
318 Plaskett, Jim242863 20.53
319 Minev, Nikolay N242765 49.73
320 Jamieson, Robert Murray242766
321 Augustin, Josef242657 38.37
322 Brinck Claussen, Bjorn242659
323 Garcia Martinez, Silvino242555 36.24
324 Kuijpers, Franciscus Antonius242463
325 Groszpeter, Attila242455 20.31
326 Burger, Karl242367 47.69
327 Rodriguez, Ruben242361 33.81
328 Harandi, Khosro242361 30.08
329 Kristiansen, Jens242254 28.35
330 Trapl, Jindrich242260 38.52
331 Rocha, Antonio242267 36.30
332 Bohosjan, Sarkis242268 39.51
333 Grinberg, Ricardo242275 32.71
334 Pokojowczyk, Jerzy242154 31.61
335 Vera, Reynaldo242176 19.73
336 Cvetkovic, Srdjan242161 34.59
337 Ioseliani, Nana242063 18.63
338 Ostermeyer, Peter242071 36.96
339 Webb, Simon241962 31.30
340 Djuric, Stefan241964 25.18
341 Vilela, Jose Luis241855 27.53
342 Ilic, Zoran241867 17.16
343 Clemens, Christian241869 40.15
344 Sisniega, Marcel241765 21.17
345 Nogueiras, Jesus241765 21.20
346 Pavlov, Mircea241763 43.04
347 Bellin, Robert241653 28.25
348 Ciric, Dragoljub M241565 44.88
349 Hase, Juan Carlos241562
350 Franco Ocampos, Zenon241458 24.38
351 Bielczyk, Jacek241454 27.60
352 Renman, Nils Gustaf241363
353 Gruenberg, Hans Ulrich241265 24.72
354 Tomaszewski, Roman241257 20.37
355 Pritchett, Craig William241266
356 Fedder, Steen241259 29.29
357 Dueckstein, Andreas241265 53.16
358 deFirmian, Nicholas E241161 23.18
359 Enklaar, Bertus F241064
360 Morris, Walter D241059 22.08
361 Mascarinas, Rico240965 27.58
362 Strauss, David J240870 34.15
363 Franklin, Michael J240865 49.66
364 Van der Sterren, Paul240852 24.54
365 Janoševic, Dragoljub240763 57.23
366 Toth, Bela240760 37.45
367 Watson, John L240769 29.07
368 Rohde, Michael A240672 21.09
369 Swic, Waldemar240565 27.55
370 Zapata, Alonso240558 22.11
371 Bellon Lopez, Juan Manuel240557 30.39
372 Hartoch, Robert G240562
373 Dobosz, Henryk240554 27.53
374 Fedorowicz, John P240455 22.01
375 Bergstrom, Christer240476 22.01
376 Balshan, Amikam240363
377 Biriescu, Ioan240270 26.92
378 Svensson, Bengt240276 20.23
379 Welin, Thomas240165 21.07
380 Hebert, Jean240157 22.88
381 Bouaziz, Slim240158 30.45
382 Gruchacz, Robert240165 26.83
383 Wittmann, Walter240063 32.55
384 Henley, Ron W240065 23.82
385 Law, Andrew P239971 30.22
386 Emma, Jaime J239859 42.70
387 Hoi, Carsten239855 23.70
388 Lanka, Zigurds239769 20.36
389 Skrobek, Ryszard239757 29.24
390 Cappello, Renato239667
391 Przewoznik, Jan239656 23.04
392 Peev, Peicho Chonev239671 40.49
393 Nicevski, Risto239660 35.26
394 Rumens, David E239567 41.02
395 Lombard, Andre239470 30.03
396 Short, Nigel D239455 15.33
397 Littlewood, Paul E239463 24.70
398 Bronstein, Luis239356 34.33
399 Grigorov, Jordan N239365 26.81
400 Gonsior, Evzen239259 48.81
401 Foygel, Igor239272
402 Kagan, Shimon239254 38.48
403 Lau, Ralf239266 20.94
404 Flear, Glenn C239267 21.63
405 Iskov, Gert239255 32.17
406 Taylor, Timothy239174 27.64
407 Moehring, Guenther239156 43.85
408 Cording, Harm239069 43.72
409 Jacobsen, Bo239075 31.80
410 Sloth, Jorn238963 36.07
411 Bojkovic, Slobodan238975 35.18
412 Garcia Palermo, Carlos238960 26.83
413 Ost Hansen, Jacob238972
414 Lobron, Eric238966 20.40
415 Despotovic, Momcilo238869 32.57
416 Rigo, Janos238857 31.92
417 Sibarevic, Milenko238868 35.55
418 Nikolic, Predrag238769 20.05
419 Kengis, Edvins238673 21.47
420 Lanc, Alois238675 32.62
421 Banas, Jan238655 33.32
422 Visier Segovia, Fernando238673 37.66
423 Lieb, Harald238668 45.76
424 Goodman, David SC238663
425 Borm, Franciscus WM238561
426 Szymczak, Zbigniew238567 28.74
427 Neckar, Lubomir238465 30.16
428 Van Riemsdijk, Herman C238455 32.09
429 Brondum, Eric238465 38.79
430 Kaiszauri, Konstanty238455 27.92
431 Paehtz, Thomas Sr238363 24.07
432 Watzka, Horst238365 42.05
433 Whiteley, Andrew J238268 33.31
434 Cuasnicu, Oscar238266 37.93
435 Hoelzl, Franz238256 34.48
436 Soos, Bela238175 50.56
437 Horvath, Tamas238064 28.93
438 Cuartas, Carlos238059 40.12
439 Djukic, Zeljko238071 21.30
440 Adamski, Andrzej237960 41.71
441 Schiffer, Karl Josef237870
442 Rajna, George237869 33.63
443 Benjamin, Joel L237761 16.55
444 Coudari, Camille237667 29.17
445 Akesson, Ralf237665 19.64
446 De Bruycker, Bernard237674 39.29
447 Pavlovic, Dejan237571
448 Odendahl, Steven M237562 20.92
449 Van der Vliet, Fredrik237560
450 Segal, Alexandru Sorin237458 32.98
451 Mišta, Ladislav237468 36.91
452 Andres Mendez, Miguel237370
453 Danner, Georg237360 33.92
454 Scheeren, Peter237358 25.17
455 Fries Nielsen, Jens Ove237355 20.60
456 Szilágyi, György237375 59.24
457 Rosenlund, Thorbjorn237175 29.28
458 Rossetto, Héctor D237165 58.06
459 Schinzel, Wladyslaw237152 37.36
460 Basman, Michael J237063 34.54
461 Angantysson, Haukur236961 31.83
462 Helmers, Knut J236864 23.65
463 Rantanen, Yrjo A236763 30.44
464 Cooper, John Grantley236768
465 Filguth, Rubens A236765 24.52
466 Jamroz, Zbigniew236771 46.30
467 Kastner, Jeffrey236573 30.71
468 Ristic, Nenad236471 21.86
469 Sapi, Laszlo236467 45.53
470 Fuller, Maxwell L236456 35.67
471 Filipowicz, Andrzej236266 42.38
472 Petran, Pal236257 34.04
473 Nun, Jiri236262 23.17
474 Root, Douglas236166 17.63
475 Olafsson, Helgi236159 24.12
476 Sikora Lerch, Jan236054
477 Trois, Francisco RT235955
478 Ionescu, Constantin235867 22.05
479 Kelecevic, Nedeljko235870 33.55
480 Gross, Stefan235759 31.09
481 Day, Lawrence A235771 31.66
482 Orso, Miklos235659 24.31
483 Hess, Ralf235663 36.51
484 Mortensen, Erling235557 25.48
485 Giardelli, Sergio C235560 25.26
486 Barreras, Alberto235475 29.48
487 Formanek, Edward W235365 38.40
488 Hodgson, Julian M235269 17.18
489 Rakic, Tomislav234961 45.88
490 Holm, Sejer234865 41.14
491 Hvenekilde, Jorgen234866 45.09
492 Frias, Victor J234866 24.64
493 Braga, Fernando234861 22.22
494 Hansen, Curt234771 16.03
495 Kovacs, Laszlo M234758 41.98
496 Kouatly, Bachar234671 22.57
497 Maciejewski, Andrzej234564 29.22
498 Niklasson, Christer234457 27.74
499 Tichy, Vladimir234470 33.99
500 Hesse, Peter234457 36.00

These ratings, calculated as of September 30, 1980, incorporate all games (against rated opponents) played in the time between September 1, 1979 and September 30, 1980, along with the ratings that were already calculated as of August 31, 1979. 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, 1980. This represents the player's estimated strength on October 1, 1980.

+/- 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, 1980. The +/- value represents the standard deviation of that estimate; the player's true strength on October 1, 1980 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, 1980. 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, 1980. 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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