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Top 10 active players as of July 31, 1980

  #  

Player Rating +/-
1 Karpov, Anatoly E280450
2 Korchnoi, Viktor L276749
3 Portisch, Lajos271950
4 Polugaevsky, Lev A271449
5 Kasparov, Garry K270052
6 Tal, Mikhail269349
7 Spassky, Boris V269349
8 Geller, Efim P268951
9 Timman, Jan H267948
10 Petrosian, Tigran V267849

About these ratings

Top 500 active players as of July 31, 1980

  #  

Player Rating +/- Best? 75%? Age
1 Karpov, Anatoly E28045055.6% #229.19
2 Korchnoi, Viktor L27674920.8% #649.36
3 Portisch, Lajos2719504.4% #1643.32
4 Polugaevsky, Lev A2714493.5% #1745.70
5 Kasparov, Garry K2700522.5% #2417.30
6 Tal, Mikhail2693491.3% #2543.73
7 Spassky, Boris V2693491.4% #2643.50
8 Geller, Efim P2689511.5% #2855.41
9 Timman, Jan H2679480.6% #3228.63
10 Petrosian, Tigran V2678490.7% #3351.12
11 Beliavsky, Alexander G2677500.7% #3426.62
12 Romanishin, Oleg M2667490.3% #4028.56
13 Hübner, Robert2665500.3% #4131.73
14 Mecking, Henrique2665681.9% #5028.52
15 Balashov, Yury S2663500.4% #4331.38
16 Andersson, Ulf2660480.3% #4429.09
17 Larsen, Bent2657480.2% #4645.41
18 Jussupow, Artur M2650520.2% #5320.47
19 Hort, Vlastimil2650480.1% #5136.55
20 Ribli, Zoltán2647500.1% #5428.90
21 Miles, Anthony J2640470.1% #5725.27
22 Ljubojevic, Ljubomir2639490.1% #6029.74
23 Tseshkovsky, Vitaly V2639500.1% #6035.85
24 Gufeld, Eduard E2637550.2% #6344.37
25 Vaganian, Rafael A2636490.1% #6228.79
26 Dolmatov, Sergey V2636530.1% #6421.45
27 Gulko, Boris F2633540.1% #6733.48
28 Vasiukov, Evgeny A2633580.2% #7047.40
29 Lerner, Konstantin Z2632560.2% #6930.42
30 Psakhis, Lev B2631610.2% #7221.67
31 Mikhalchishin, Adrian B2628520.1% #7025.70
32 Sveshnikov, Evgeny E2627510.1% #7030.47
33 Gheorghiu, Florin262649 #7036.32
34 Kholmov, Ratmir D2625560.1% #7555.22
35 Dzindzichashvili, Roman Y2623530.1% #7536.24
36 Savon, Vladimir A2621550.1% #7839.85
37 Rashkovsky, Nukhim N2618560.1% #8234.29
38 Sosonko, Gennadi261649 #7937.20
39 Browne, Walter S261549 #7931.56
40 Kuzmin, Gennady P261551 #8134.53
41 Kupreichik, Viktor D261253 #8531.08
42 Sax, Gyula261149 #8429.12
43 Parma, Bruno2611570.1% #8838.59
44 Dvoretsky, Mark I2610650.2% #9332.64
45 Palatnik, Semen A2610660.2% #9530.35
46 Unzicker, Wolfgang261055 #8855.10
47 Kavalek, Lubomir260851 #8636.97
48 Makarichev, Sergey Y260852 #8726.70
49 Dorfman, Iosif D260853 #8828.25
50 Smyslov, Vassily V260851 #8759.35
51 Ivanov, Igor V2608710.3% #10033.56
52 Bagirov, Vladimir K260654 #9143.95
53 Kochiev, Alexander260555 #9224.35
54 Gipslis, Aivars2603620.1% #9943.48
55 Tukmakov, Vladimir B260252 #9334.38
56 Ivkov, Borislav260250 #9246.72
57 Kurajica, Bojan260253 #9432.71
58 Smejkal, Jan259949 #9434.36
59 Georgadze, Tamaz V259852 #9632.73
60 Razuvaev, Yury S259552 #10034.81
61 Alburt, Lev O259552 #10034.94
62 Gligoric, Svetozar259450 #10057.49
63 Adorján, András259149 #10230.33
64 Liberzon, Vladimir M258951 #10543.36
65 Nunn, John D M258851 #10625.27
66 Evans, Larry M258763 #11548.36
67 Tarjan, James E258655 #11028.44
68 Bronstein, David I258057 #11756.45
69 Olafsson, Fridrik257958 #11945.51
70 Szabó, László257863 #12363.37
71 Pfleger, Helmut257759 #12136.98
72 Petrosian, Arshak B257759 #12226.62
73 Taimanov, Mark E257559 #12454.48
74 Seirawan, Yasser257551 #11820.35
75 Vitolinš, Alvis257558 #12434.13
76 Ubilava, Elizbar E257466 #12929.92
77 Suetin, Alexey S257360 #12653.71
78 Ftácnik, Lubomír257151 #12222.75
79 Panno, Oscar R257051 #12345.37
80 Chekhov, Valery A256768 #13624.68
81 Matanovic, Aleksandar256562 #13650.19
82 Kharitonov, Andrey Y256460 #13421.32
83 Stean, Michael F256349 #12926.91
84 Darga, Klaus V256261 #13646.44
85 Byrne, Robert E256050 #13152.28
86 Tseitlin, Mikhail S255954 #13533.12
87 Lombardy, William J255957 #13742.66
88 Klovans, Janis255871 #14645.31
89 Kapengut, Albert Z255766 #14336.07
90 Quinteros, Miguel A255750 #13532.59
91 Lein, Anatoly255751 #13549.34
92 Ivanov, Alexander V255761 #14024.25
93 Zaitsev, Igor A255655 #13942.18
94 Nemet, Ivan255655 #13937.30
95 Knaak, Rainer F255551 #13727.37
96 Matulovic, Milan255462 #14445.14
97 Panchenko, Alexander N255462 #14426.82
98 Luczak, Andrzej255455 #14031.65
99 Antoshin, Vladimir S255360 #14351.21
100 Grigorian, Karen A255154 #14232.90
101 Timoshchenko, Gennady255155 31.26
102 Shamkovich, Leonid A255051 57.16
103 Filip, Miroslav254961 51.76
104 Pachmann, Ludek254759 56.22
105 Tringov, Georgy P254759 43.40
106 Vogt, Lothar H254649 28.54
107 Uhlmann, Wolfgang254551 45.34
108 Speelman, Jonathan S254551 23.83
109 Yurtaev, Leonid254563 21.25
110 Kovacevic, Vladimir254457 38.35
111 Bukic, Enver254457 42.66
112 Veingold, Aleksander254268 26.81
113 Najdorf, Miguel254053 70.29
114 Ree, Hans254049 35.88
115 Nei, Iivo253965 48.75
116 Pintér, József253755 26.73
117 Kaplan, Julio P253760 30.02
118 Csom, István253750 40.16
119 Rogoff, Kenneth S253460 27.36
120 Faragó, Iván253349 34.33
121 Gruenfeld, Yehuda253355 24.42
122 Christiansen, Larry M253352 24.09
123 Lputian, Smbat G253257 22.46
124 Nikolac, Juraj253155 48.27
125 Vukic, Milan253155 36.94
126 Díez del Corral, Jesús252860 47.32
127 Reshevsky, Samuel H252858 68.68
128 Peresipkin, Vladimir252767
129 Keene, Raymond252652
130 Zaltsman, Vitaly F252657 38.76
131 Piasetski, Leon David252671
132 Radulov, Ivan252557 41.56
133 Magerramov, Elmar S252558 22.31
134 Stoica, Valentin252563 30.46
135 Torre, Eugenio252450 28.74
136 Peters, John A252355 29.47
137 Eingorn, Viacheslav S252273 23.68
138 Petrushin, Alexander I252267 33.39
139 Weinstein, Norman251967 29.82
140 Malich, Burkhard G251958 43.67
141 Marjanovic, Slavoljub251952 25.57
142 Knezevic, Milorad251852 43.75
143 Lukin, Andrei M251871 31.92
144 Gurgenidze, Bukhuti I251870 46.72
145 Anikaev, Yury251758 32.09
146 Kakageldyev, Amanmurad251666 30.59
147 Schmidt, Wlodzimierz251651 37.31
148 Biyiasas, Peter251652 29.70
149 Lutikov, Anatoly S251664 47.49
150 Schneider, Lars Ake251555
151 Benko, Pal C251459 52.04
152 Velimirovic, Dragoljub251352 38.22
153 Tatai, Stefano251356 42.36
154 Popov, Luben251157 44.51
155 Vorotnikov, Vladislav V251067 32.95
156 Bleiman, Yaacov250964 32.90
157 Mnatsakanian, Eduard A250857 41.65
158 Marangunic, Srdjan250867 36.75
159 Suba, Mihai250653 33.16
160 Vokác, Marek250658 21.65
161 Hecht, Hans-Joachim250566 41.51
162 Sunye Neto, Jaime250353 23.24
163 Bilek, István250359 47.96
164 Regan, Kenneth250364 20.88
165 Moiseev, Oleg L250362 55.23
166 Polovodin, Igor A250368 25.36
167 Mariotti, Sergio250259 33.97
168 Donner, Johannes H250255 53.07
169 Padevsky, Nikola B250159 47.17
170 Vladimirov, Evgeny Y250167 23.53
171 Sturua, Zurab250065 21.15
172 García Gonzáles, Guillermo250054 26.64
173 Jansson, Borje249966 38.38
174 Hulak, Krunoslav249963 29.18
175 Kraidman, Yair249863 47.75
176 Kirov Ivanov, Nino249753 34.89
177 Langeweg, Kick249652 43.40
178 Makropoulos, Georgios249560 26.84
179 Barczay, Laszlo249453 44.44
180 Lukacs, Peter249352 30.06
181 Grefe, John A249364 32.90
182 Diesen, Mark C249359
183 Zaichik, Gennady L249263 23.47
184 Ungureanu, Emil249273 43.75
185 Piesina, Gintautas249269 28.31
186 Minic, Dragoljub249171 43.40
187 Rodriguez, Amador249157 23.90
188 van der Wiel, John T H249151 20.97
189 Sigurjónsson, Gudmundur249053 32.85
190 Lechtynsky, Jiri249053 32.68
191 Zuckerman, Bernard249069 37.33
192 Zilberstein, Valery I248969 37.30
193 Marovic, Dražen248962 42.55
194 Popovic, Petar248857 21.46
195 Plachetka, Jan248849 35.45
196 Ghinda, Mihail Viorel248753 31.02
197 Soltis, Andrew E248667 33.17
198 Ermenkov, Evgenij248653 30.84
199 Petkevich, Jusefs248670 39.62
200 Commons, Kim S248574 29.02
201 Rogulj, Branko248556 28.99
202 Hazai, Laszlo248557 27.13
203 Mednis, Edmar J248454 43.36
204 Jansa, Vlastimil248451 37.68
205 Wedberg, Tom248354 26.68
206 Gaprindashvili, Nona248264 39.24
207 Musil, Vojko248269 34.95
208 Calvo Minguez, Ricardo248171 36.77
209 Ciocaltea, Victor248055 48.54
210 Chernin, Alexander M247874 20.40
211 Ivanovic, Božidar247652 33.93
212 Espig, Lutz247651 31.57
213 Forintos, Gyözö V247557 45.00
214 Sahovic, Dragutin247455 39.97
215 Jakobsen, Ole247354 37.78
216 Van Wijgerden, Cornelis247355 30.19
217 Portisch, Ferenc247355 41.31
218 Hartston, William R247356 32.96
219 Bradford, Joseph M247163 29.75
220 Hennings, Artur247165 40.05
221 Kuligowski, Adam247051 24.60
222 Hamann, Svend247065 39.81
223 Robatsch, Karl247057 51.80
224 Vadasz, Laszlo246953 32.51
225 Ornstein, Axel246954 28.27
226 Karner, Hillar246975 45.01
227 Borik, Otto246865 32.85
228 Prandstetter, Eduard246851 31.63
229 Rath, Ulrik246872 33.60
230 Rytov, Boris246869
231 Lederman, Leon246769 33.18
232 Hernandez, Roman246756 30.69
233 Jelen, Iztok246768 33.53
234 Ligterink, Gert246750 30.70
235 Ambroz, Jan246757 26.12
236 Lengyel, Levente246754 47.13
237 Hug, Werner246658 27.89
238 Inkiov, Ventzislav246656 24.20
239 Cebalo, Mišo246672 35.48
240 Messing, Hrvoje246573 40.01
241 Szekely, Peter246559 25.48
242 Hausner, Ivan246556 28.29
243 Damjanovic, Mato246558 53.36
244 Podzielny, Karl Heinz246563 25.89
245 Karaklajic, Nikola246470 54.44
246 Vooremaa, Andres246369 36.03
247 Gavrikov, Victor N246263 23.01
248 Karlsson, Lars246152 25.05
249 Ghitescu, Theodor246155 46.52
250 Castro Rojas, Oscar Humberto246059 27.23
251 Kunsztowicz, Uwe246068 36.54
252 Bisguier, Arthur B246059 50.81
253 Rajkovic, Dusan245957 38.12
254 Kaufman, Larry C245966 32.71
255 Szmetan, Jorge245954 30.18
256 Spassov, Liuben245953 37.36
257 Raicevic, Vladimir245957 31.24
258 Gerusel, Mathias245866 42.49
259 Westerinen, Heikki MJ245753 36.26
260 Garcia, Raimundo245666 44.18
261 Przewoznik, Jan245557 22.87
262 Mochalov, Evgeny V245571 28.76
263 Bönsch, Uwe245553 21.79
264 Řgaard, Leif245563 28.57
265 Gutman, Lev245465 34.85
266 Honfi, Karoly245367 49.77
267 Schussler, Harry245152 23.10
268 Debarnot, Roberto245163 32.98
269 Planinc, Albin245057 36.29
270 Adamski, Jan245051 36.72
271 Garcia, Gildardo244963 26.39
272 Mestel, A Jonathan244852 23.38
273 Schweber, Samuel244858 44.04
274 Chandler, Murray G244853 20.32
275 Mikenas, Vladas244872 70.29
276 Rukavina, Josip244767 37.67
277 Pytel, Krzysztof244656 35.21
278 Rodriguez Vargas, Orestes244660 37.07
279 Cramling, Dan244663 21.49
280 Chiburdanidze, Maia G244455 19.54
281 Svensson, Bengt244469 20.06
282 Haik, Aldo244462 27.78
283 Bohm, Hans244351 30.54
284 Plaskett, Jim244260 20.37
285 Qi Jingxuan244262 32.73
286 Taulbut, Shaun M244159 22.55
287 Pomar Salamanca, Arturo244168 48.91
288 Rubinetti, Jorge A244155 35.33
289 Liebert, Heinz244165 44.19
290 Hansson, Dan244068 28.14
291 Dely, Peter244067 46.07
292 Azmaiparashvili, Zurab A244069 20.37
293 Meduna, Eduard243957 29.89
294 Zichichi, Alvise243962 42.07
295 Sydor, Andrzej243963 43.58
296 Minev, Nikolay N243966 49.56
297 Burger, Karl243868 47.52
298 Groszpeter, Attila243854 20.14
299 Botterill, George Steven243857
300 Garcia Martinez, Silvino243854 36.07
301 Pétursson, Margeir243656 20.46
302 Georgiev, Krum243670 22.19
303 Ostojic, Predrag243563 42.44
304 Balinas, Rosendo Carrean243564
305 Barle, Janez243562 28.36
306 Haygarth, Michael J243575
307 Wirthensohn, Heinz243563 29.24
308 Flesch, Janos243574 46.84
309 Joksic, Sinisa243463 39.81
310 Brinck Claussen, Bjorn243459
311 Bednarski, Jacek B243457 41.38
312 Rocha, Antonio243470 36.13
313 Doda, Zbigniew243363 49.44
314 Arnason, Jon L243354 19.72
315 Spiridonov, Nikola243353 42.42
316 Horner, Jeff243372 30.93
317 Sideif Sade, Fikret I243270 28.58
318 Tischbierek, Raj243259 17.85
319 Pribyl, Josef243252 32.80
320 Klaric, Zlatko243166 23.77
321 Duer, Arne243161 21.06
322 Martinovic, Slobodan243159 35.02
323 Djuric, Stefan242964 25.01
324 Vilela, Jose Luis242957 27.37
325 Trapl, Jindrich242860 38.35
326 Vera, Reynaldo242876 19.56
327 Tompa, Janos242856 33.25
328 Matera, Salvatore Joseph242862
329 Birnboim, Nathan242765 29.68
330 Kuijpers, Franciscus Antonius242764
331 Enklaar, Bertus F242761
332 Rodriguez, Ruben242761 33.65
333 Morris, Walter D242663 21.91
334 Augustin, Josef242556 38.20
335 Velikov, Petar242569 29.34
336 Bielczyk, Jacek242454 27.44
337 Ekstroem, Roland242473 24.19
338 Van der Sterren, Paul242352 24.37
339 Grinberg, Ricardo242375 32.55
340 Sisniega, Marcel242364 21.01
341 Sznapik, Aleksander242351 29.47
342 Kestler, Hans-Günter242272 40.63
343 Cvetkovic, Srdjan242161 34.42
344 Ostermeyer, Peter242071 36.80
345 Bohosjan, Sarkis242066 39.34
346 Harandi, Khosro242060 29.91
347 Clemens, Christian242069 39.98
348 Goodman, David SC241963
349 Bergstrom, Christer241971 21.84
350 Kristiansen, Jens241854 28.18
351 Hase, Juan Carlos241862
352 Hoelzl, Franz241855 34.32
353 Bellin, Robert241753 28.09
354 Ilic, Zoran241767 16.99
355 Mascarinas, Rico241663 27.41
356 Short, Nigel D241654 15.16
357 Zapata, Alonso241559 21.94
358 Jamieson, Robert Murray241565
359 Dobosz, Henryk241554 27.36
360 Janoševic, Dragoljub241561 57.06
361 Littlewood, John Eric241568
362 Bellon Lopez, Juan Manuel241556 30.23
363 Franco Ocampos, Zenon241558 24.22
364 Kinnmark, Ove241575 35.60
365 Webb, Simon241460 31.14
366 Pavlov, Mircea241463 42.88
367 Strauss, David J241367 33.98
368 Gruenberg, Hans Ulrich241365 24.56
369 Hartoch, Robert G241361
370 Watson, John L241267 28.90
371 Fedorowicz, John P241253 21.84
372 Dueckstein, Andreas241065 52.99
373 Pritchett, Craig William241070
374 Renman, Nils Gustaf240862
375 Hoi, Carsten240855 23.54
376 Nogueiras, Jesus240767 21.04
377 Rohde, Michael A240772 20.92
378 Skrobek, Ryszard240757 29.07
379 Toth, Bela240760 37.28
380 Pokojowczyk, Jerzy240555 31.44
381 Fedder, Steen240459 29.13
382 Cámpora, Daniel H240465 23.09
383 Welin, Thomas240465 20.90
384 Ciric, Dragoljub M240466 44.72
385 Nicevski, Risto240456 35.09
386 Law, Andrew P240368 30.06
387 Emma, Jaime J240357 42.54
388 Ost Hansen, Jacob240274
389 Wittmann, Walter240263 32.38
390 Bouaziz, Slim240258 30.29
391 De Bruycker, Bernard240273 39.13
392 Sloth, Jorn240061 35.90
393 Biriescu, Ioan240070 26.76
394 Schiffer, Karl Josef240071
395 Deze, Anton239974
396 Huss, Andreas239974 29.79
397 Gruchacz, Robert239865 26.67
398 Franklin, Michael J239874 49.49
399 Coudari, Camille239866 29.01
400 Van Riemsdijk, Herman C239854 31.92
401 Cappello, Renato239767
402 Lombard, Andre239767 29.87
403 Cuartas, Carlos239660 39.95
404 Bronstein, Luis239556 34.16
405 Sibarevic, Milenko239569 35.38
406 Kagan, Shimon239554 38.32
407 Balshan, Amikam239461
408 Swic, Waldemar239463 27.39
409 Szymczak, Zbigniew239460 28.57
410 Despotovic, Momcilo239470 32.41
411 Foygel, Igor239372
412 Moehring, Guenther239356 43.68
413 Iskov, Gert239355 32.01
414 Taylor, Timothy239274 27.48
415 Visier Segovia, Fernando239268 37.49
416 Peev, Peicho Chonev239268 40.33
417 Kengis, Edvins239176 21.30
418 Jacobsen, Bo239175 31.63
419 Garcia Padron, Jose239073 22.36
420 Odendahl, Steven M239061 20.77
421 Lau, Ralf238966 20.78
422 Lobron, Eric238966 20.23
423 Nikolic, Predrag238969 19.89
424 Cording, Harm238969 43.56
425 Gonsior, Evzen238859 48.65
426 Bojkovic, Slobodan238875 35.01
427 Lanc, Alois238775 32.45
428 Lanka, Zigurds238669 20.19
429 Banas, Jan238655 33.16
430 Rigo, Janos238557 31.76
431 Neckar, Lubomir238565 29.99
432 Borm, Franciscus WM238460
433 Cuasnicu, Oscar238366 37.77
434 Horvath, Tamas238363 28.77
435 Jamroz, Zbigniew238361 46.14
436 Lieb, Harald238268 45.60
437 Soos, Bela238275 50.40
438 Whiteley, Andrew J238265 33.14
439 Watzka, Horst238265 41.88
440 Henley, Ron W238167 23.65
441 Van der Vliet, Fredrik238160
442 Djukic, Zeljko237871 21.13
443 Garcia Palermo, Carlos237862 26.66
444 Rajna, George237867 33.46
445 Paehtz, Thomas Sr237763 23.91
446 Segal, Alexandru Sorin237758 32.82
447 Mišta, Ladislav237768 36.75
448 Schinzel, Wladyslaw237651 37.19
449 Andres Mendez, Miguel237670
450 Cooper, John Grantley237671
451 Danner, Georg237560 33.76
452 Szilágyi, György237475 59.07
453 Fuller, Maxwell L237457 35.51
454 Littlewood, Paul E237359 24.54
455 Benjamin, Joel L237361 16.39
456 Rossetto, Héctor D237365 57.90
457 Filguth, Rubens A237367 24.35
458 Helmers, Knut J237365 23.48
459 Pavlovic, Dejan237371
460 Grigorov, Jordan N237265 26.65
461 Scheeren, Peter237159 25.00
462 Olafsson, Helgi237159 23.95
463 deFirmian, Nicholas E237166 23.01
464 Kaiszauri, Konstanty237055 27.77
465 Brondum, Eric236965 38.62
466 Hebden, Mark236764 22.46
467 Mortensen, Erling236757 25.32
468 Root, Douglas236466 17.47
469 Formanek, Edward W236466 38.23
470 Sapi, Laszlo236467 45.36
471 Adamski, Andrzej236461 41.55
472 Nun, Jiri236462 23.01
473 Hebert, Jean236356 22.72
474 Trois, Francisco RT236154
475 Sikora Lerch, Jan236054
476 Hvenekilde, Jorgen236067 44.92
477 Kelecevic, Nedeljko236070 33.39
478 Hess, Ralf236063 36.34
479 Filipowicz, Andrzej236064 42.22
480 Angantysson, Haukur236062 31.66
481 Gross, Stefan235959 30.92
482 Fries Nielsen, Jens Ove235955 20.44
483 Orso, Miklos235859 24.15
484 Petran, Pal235856 33.88
485 Rantanen, Yrjo A235863 30.27
486 Ionescu, Constantin235767 21.88
487 Barreras, Alberto235775 29.32
488 Wahlbom, Magnus235573 35.21
489 Akesson, Ralf235566 19.48
490 Basman, Michael J235367 34.37
491 Day, Lawrence A235370 31.50
492 Lebredo, Gerardo235363 29.99
493 Lekander, Rolf235265 33.58
494 Niklasson, Christer235257 27.57
495 Frias, Victor J235066 24.47
496 Braga, Fernando235061 22.06
497 Holm, Sejer234965 40.97
498 Rosenlund, Thorbjorn234975 29.12
499 Maciejewski, Andrzej234864 29.06
500 Kovacs, Laszlo M234858 41.82

These ratings, calculated as of July 31, 1980, incorporate all games (against rated opponents) played in the time between July 1, 1979 and July 31, 1980, along with the ratings that were already calculated as of June 30, 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 July 31, 1980. This represents the player's estimated strength on August 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 August 1, 1980. The +/- value represents the standard deviation of that estimate; the player's true strength on August 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 August 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 July 31, 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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