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Top 10 active players as of February 29, 1980

  #  

Player Rating +/-
1 Karpov, Anatoly E279950
2 Korchnoi, Viktor L276250
3 Tal, Mikhail273549
4 Kasparov, Garry K272151
5 Portisch, Lajos271650
6 Polugaevsky, Lev A269351
7 Spassky, Boris V267949
8 Geller, Efim P267551
9 Larsen, Bent267249
10 Petrosian, Tigran V267149

About these ratings

Top 500 active players as of February 29, 1980

  #  

Player Rating +/- Best? 75%? Age
1 Karpov, Anatoly E27995051.3% #328.77
2 Korchnoi, Viktor L27625019.7% #648.93
3 Tal, Mikhail2735498.2% #1143.30
4 Kasparov, Garry K2721515.4% #1516.88
5 Portisch, Lajos2716504.1% #1542.90
6 Polugaevsky, Lev A2693511.8% #2445.27
7 Spassky, Boris V2679490.9% #3143.08
8 Geller, Efim P2675510.8% #3354.98
9 Larsen, Bent2672490.5% #3444.98
10 Petrosian, Tigran V2671490.5% #3550.70
11 Timman, Jan H2667480.4% #3728.21
12 Beliavsky, Alexander G2663500.3% #4026.20
13 Romanishin, Oleg M2663490.3% #4028.13
14 Hübner, Robert2658500.3% #4331.31
15 Balashov, Yury S2657500.3% #4430.96
16 Mecking, Henrique2655681.4% #5428.10
17 Hort, Vlastimil2643480.1% #5236.13
18 Tukmakov, Vladimir B2643530.2% #5533.95
19 Andersson, Ulf2643480.1% #5328.67
20 Gulko, Boris F2642530.2% #5633.05
21 Ribli, Zoltán2639500.1% #5728.48
22 Vaganian, Rafael A2638490.1% #5728.37
23 Ljubojevic, Ljubomir2634490.1% #6029.32
24 Dolmatov, Sergey V2633550.1% #6421.02
25 Gufeld, Eduard E2633550.2% #6443.94
26 Vasiukov, Evgeny A2631580.2% #6746.98
27 Lerner, Konstantin Z2631560.2% #6630.00
28 Savon, Vladimir A2630560.2% #6739.42
29 Tseshkovsky, Vitaly V262950 #6435.43
30 Gheorghiu, Florin262750 #6635.90
31 Jussupow, Artur M2626520.1% #6820.04
32 Sveshnikov, Evgeny E2624510.1% #7030.05
33 Ivanov, Igor V2623700.6% #8133.14
34 Browne, Walter S262249 #7031.13
35 Smejkal, Jan262149 #7133.93
36 Kupreichik, Viktor D2621530.1% #7330.65
37 Mikhalchishin, Adrian B262052 #7325.28
38 Kavalek, Lubomir261951 #7336.55
39 Kholmov, Ratmir D2618560.1% #7854.79
40 Dorfman, Iosif D261552 #7827.83
41 Kuzmin, Gennady P261551 #7734.11
42 Smyslov, Vassily V260951 #8258.92
43 Gligoric, Svetozar260850 #8457.07
44 Rashkovsky, Nukhim N260756 #8833.86
45 Makarichev, Sergey Y260652 #8626.28
46 Unzicker, Wolfgang260556 #8954.67
47 Sax, Gyula260549 #8528.70
48 Psakhis, Lev B2605610.1% #9321.25
49 Parma, Bruno260455 #9038.16
50 Miles, Anthony J260447 #8524.85
51 Bagirov, Vladimir K260253 #9043.54
52 Liberzon, Vladimir M260151 #8942.93
53 Alburt, Lev O259853 #9434.52
54 Dzindzichashvili, Roman Y259854 #9535.81
55 Gipslis, Aivars2597600.1% #9943.06
56 Georgadze, Tamaz V259652 #9532.30
57 Dvoretsky, Mark I2596650.1% #10332.22
58 Kochiev, Alexander259654 #9723.92
59 Sosonko, Gennadi259549 #9436.78
60 Ivkov, Borislav259150 #9846.30
61 Palatnik, Semen A2591650.1% #10729.92
62 Razuvaev, Yury S259152 #10034.38
63 Gruenfeld, Yehuda258755 #10524.00
64 Nunn, John D M258651 #10524.84
65 Bronstein, David I257955 #11356.03
66 Tarjan, James E257953 #11228.02
67 Adorján, András257749 #11029.91
68 Kurajica, Bojan257754 #11432.29
69 Olafsson, Fridrik257057 #12245.09
70 Pfleger, Helmut257059 #12336.56
71 Taimanov, Mark E256958 #12454.06
72 Zakharov, Alexander V2569750.1% #13536.39
73 Grigorian, Karen A256957 #12332.48
74 Tseitlin, Mikhail S256854 #12332.70
75 Chekhov, Valery A256868 #13124.26
76 Seirawan, Yasser256751 #12119.92
77 Luczak, Andrzej256754 #12431.23
78 Szabó, László256663 #13162.94
79 Suetin, Alexey S256660 #12853.29
80 Matanovic, Aleksandar256558 #12849.77
81 Darga, Klaus V256360 #13046.01
82 Byrne, Robert E256351 #12651.86
83 Lein, Anatoly256251 #12648.91
84 Ftácnik, Lubomír255951 #13022.33
85 Stean, Michael F255950 #12926.48
86 Kapengut, Albert Z255763 #13835.65
87 Panchenko, Alexander N255761 #13726.40
88 Antoshin, Vladimir S255660 #13750.79
89 Rogoff, Kenneth S255662 #13926.93
90 Magerramov, Elmar S255558 #13721.88
91 Klovans, Janis255269 #14544.89
92 Zaitsev, Igor A255155 #13941.76
93 Shamkovich, Leonid A255152 #13756.74
94 Uhlmann, Wolfgang255151 #13644.91
95 Timoshchenko, Gennady255155 #13930.84
96 Lombardy, William J255154 #14042.23
97 Panno, Oscar R254952 #13944.94
98 Matulovic, Milan254960 #14444.72
99 Kovacevic, Vladimir254856 #14237.92
100 Csom, István254750 #13839.74
101 Tringov, Georgy P254759 42.97
102 Filip, Miroslav254760 51.34
103 Quinteros, Miguel A254750 32.17
104 Ubilava, Elizbar E254566 29.51
105 Ivanov, Alexander V254261 23.83
106 Pachmann, Ludek254258 55.80
107 Vogt, Lothar H254149 28.12
108 Nemet, Ivan253957 36.87
109 Reshevsky, Samuel H253957 68.26
110 Evans, Larry M253867 47.93
111 Veingold, Aleksander253768 26.38
112 Nikolac, Juraj253754 47.85
113 Torre, Eugenio253650 28.32
114 Najdorf, Miguel253653 69.87
115 Nei, Iivo253664 48.33
116 Yurtaev, Leonid253663 20.83
117 Bukic, Enver253655 42.24
118 Katalymov, Boris N253474
119 Vitolinš, Alvis253364 33.70
120 Ree, Hans253349 35.45
121 Biyiasas, Peter253053 29.28
122 Kaplan, Julio P252761 29.59
123 Eingorn, Viacheslav S252770 23.26
124 Peters, John A252657 29.05
125 Vorotnikov, Vladislav V252667 32.53
126 Knaak, Rainer F252551 26.95
127 Benko, Pal C252359 51.62
128 Peresipkin, Vladimir252366
129 Pintér, József252354 26.30
130 Díez del Corral, Jesús252260 46.90
131 Piasetski, Leon David252171
132 Petrosian, Arshak B252068 26.20
133 Rogulj, Branko251959 28.58
134 Schmidt, Wlodzimierz251852 36.88
135 Vukic, Milan251754 36.53
136 Anikaev, Yury251759 31.67
137 Faragó, Iván251649 33.91
138 Speelman, Jonathan S251652 23.41
139 Moiseev, Oleg L251563 54.81
140 Grefe, John A251564 32.48
141 Stoica, Valentin251468 30.04
142 Hecht, Hans-Joachim251370 41.08
143 Averkin, Orest N251374 36.01
144 Kakageldyev, Amanmurad251367 30.17
145 Lutikov, Anatoly S251264 47.06
146 Weinstein, Norman251262 29.40
147 Gurgenidze, Bukhuti I251269 46.29
148 Knezevic, Milorad251152 43.33
149 Radulov, Ivan251055 41.14
150 Malich, Burkhard G251058 43.25
151 Marjanovic, Slavoljub250951 25.15
152 Tatai, Stefano250954 41.93
153 Velimirovic, Dragoljub250851 37.80
154 Christiansen, Larry M250752 23.67
155 Lukin, Andrei M250675 31.50
156 Bleiman, Yaacov250564 32.47
157 Petrushin, Alexander I250565 32.96
158 Hulak, Krunoslav250462 28.76
159 Kharitonov, Andrey Y250269 20.90
160 Schneider, Lars Ake250255
161 Vokác, Marek250258 21.23
162 Sunye Neto, Jaime250154 22.82
163 García Gonzáles, Guillermo250053 26.22
164 Popov, Luben250057 44.09
165 Popovic, Petar249960 21.04
166 Suba, Mihai249855 32.74
167 Donner, Johannes H249855 52.65
168 Bilek, István249760 47.55
169 Keene, Raymond249753
170 van der Wiel, John T H249752 20.55
171 Sigurjónsson, Gudmundur249652 32.43
172 Padevsky, Nikola B249657 46.75
173 Regan, Kenneth249562 20.46
174 Mariotti, Sergio249456 33.55
175 Kraidman, Yair249463 47.33
176 Plachetka, Jan249450 35.03
177 Jansson, Borje249367 37.96
178 Polovodin, Igor A249368 24.93
179 Ciocaltea, Victor249356 48.12
180 Marangunic, Srdjan249261 36.33
181 Diesen, Mark C249157
182 Zuckerman, Bernard248965 36.91
183 Ungureanu, Emil248967 43.33
184 Gavrikov, Victor N248862 22.58
185 Gaprindashvili, Nona248862 38.82
186 Minic, Dragoljub248771 42.98
187 Lputian, Smbat G248761 22.04
188 Bisguier, Arthur B248663 50.39
189 Inkiov, Ventzislav248457 23.78
190 Soltis, Andrew E248461 32.75
191 Kirov Ivanov, Nino248252 34.47
192 Lechtynsky, Jiri248253 32.26
193 Barczay, Laszlo248252 44.02
194 Wedberg, Tom248154 26.26
195 Mednis, Edmar J248155 42.93
196 Petkevich, Jusefs248063 39.19
197 Hermann, Manfred248075 37.49
198 Ghinda, Mihail Viorel248054 30.59
199 Rodriguez, Amador248056 23.47
200 Zilberstein, Valery I247967 36.88
201 Vladimirov, Evgeny Y247966 23.11
202 Cebalo, Mišo247972 35.06
203 Calvo Minguez, Ricardo247871 36.35
204 Forintos, Gyözö V247855 44.58
205 Vadasz, Laszlo247753 32.09
206 Jansa, Vlastimil247650 37.26
207 Ermenkov, Evgenij247654 30.42
208 Langeweg, Kick247453 42.97
209 Marovic, Dražen247457 42.12
210 Rajkovic, Dusan247256 37.70
211 Hazai, Laszlo247056 26.71
212 Zaichik, Gennady L247062 23.05
213 Karner, Hillar247071 44.59
214 Jelen, Iztok246961 33.11
215 Commons, Kim S246967 28.60
216 Espig, Lutz246951 31.15
217 Raicevic, Vladimir246758 30.82
218 Sahovic, Dragutin246753 39.56
219 Mnatsakanian, Eduard A246763 41.23
220 Hartston, William R246756 32.55
221 Zaltsman, Vitaly F246671 38.34
222 Westerinen, Heikki MJ246554 35.84
223 Vooremaa, Andres246569 35.61
224 Ornstein, Axel246554 27.85
225 Qi Jingxuan246459 32.30
226 Ambroz, Jan246457 25.70
227 Piesina, Gintautas246369 27.89
228 Robatsch, Karl246357 51.37
229 Lukacs, Peter246352 29.64
230 Zapata, Alonso246361 21.52
231 Lengyel, Levente246153 46.71
232 Hamann, Svend246165 39.39
233 Prandstetter, Eduard246152 31.20
234 Damjanovic, Mato246057 52.93
235 Messing, Hrvoje246073 39.59
236 Rytov, Boris245968
237 Podzielny, Karl Heinz245973 25.47
238 Ivanovic, Božidar245952 33.51
239 Dobosz, Henryk245960 26.94
240 Poutiainen, Pertti245875
241 Van Wijgerden, Cornelis245756 29.77
242 Hennings, Artur245765 39.63
243 Hug, Werner245659 27.47
244 Musil, Vojko245666 34.53
245 Karaklajic, Nikola245670 54.01
246 Ghitescu, Theodor245657 46.10
247 Garcia, Raimundo245566 43.76
248 Jakobsen, Ole245557 37.36
249 Hernandez, Roman245554 30.27
250 Ligterink, Gert245450 30.28
251 Szekely, Peter245459 25.06
252 Bönsch, Uwe245352 21.37
253 Planinc, Albin245356 35.86
254 Szmetan, Jorge245254 29.76
255 Gutman, Lev245265 34.42
256 Lederman, Leon245168 32.76
257 Castro Rojas, Oscar Humberto245157 26.81
258 Řgaard, Leif244963 28.15
259 Rath, Ulrik244871 33.18
260 Sznapik, Aleksander244852 29.05
261 Plaskett, Jim244859 19.94
262 Meduna, Eduard244758 29.47
263 Hausner, Ivan244756 27.87
264 Rukavina, Josip244766 37.25
265 Debarnot, Roberto244761 32.56
266 Kuligowski, Adam244551 24.18
267 Georgiev, Krum244570 21.76
268 Adamski, Jan244451 36.30
269 Portisch, Ferenc244456 40.89
270 Matera, Salvatore Joseph244466
271 Makropoulos, Georgios244462 26.42
272 Spassov, Liuben244353 36.93
273 Horner, Jeff244374 30.51
274 Schweber, Samuel244358 43.62
275 Przewoznik, Jan244257 22.45
276 Pytel, Krzysztof244156 34.79
277 Mikenas, Vladas244172 69.87
278 Mochalov, Evgeny V244069 28.33
279 Rodriguez Vargas, Orestes243959 36.65
280 Honfi, Karoly243964 49.34
281 Rubinetti, Jorge A243955 34.91
282 Pomar Salamanca, Arturo243966 48.49
283 Karlsson, Lars243855 24.63
284 Bednarski, Jacek B243758 40.96
285 Trapl, Jindrich243757 37.92
286 Chiburdanidze, Maia G243755 19.12
287 Sisniega, Marcel243663 20.59
288 Strauss, David J243564 33.56
289 Kaufman, Larry C243571 32.29
290 Borik, Otto243463 32.43
291 Hansson, Dan243368 27.72
292 Schussler, Harry243352 22.68
293 Rodriguez, Ruben243361 33.23
294 Mestel, A Jonathan243252 22.95
295 Barle, Janez243257 27.93
296 Spiridonov, Nikola243255 42.00
297 Nicevski, Risto243159 34.67
298 Azmaiparashvili, Zurab A243169 19.95
299 Botterill, George Steven243157
300 Ostojic, Predrag243160 42.02
301 Liebert, Heinz243065 43.76
302 Pribyl, Josef242951 32.38
303 Taulbut, Shaun M242959 22.13
304 Sydor, Andrzej242862 43.15
305 Garcia Martinez, Silvino242854 35.65
306 Rohde, Michael A242765 20.51
307 Flesch, Janos242773 46.41
308 Gerusel, Mathias242761 42.06
309 Groszpeter, Attila242657 19.72
310 Minev, Nikolay N242663 49.14
311 Joksic, Sinisa242563 39.38
312 Grinberg, Ricardo242575 32.12
313 Duer, Arne242565 20.63
314 Dely, Peter242567 45.65
315 Balinas, Rosendo Carrean242459
316 Bohm, Hans242451 30.12
317 Kunsztowicz, Uwe242469 36.11
318 Sloth, Jorn242470 35.48
319 Rocha, Antonio242368 35.71
320 Martinovic, Slobodan242357 34.59
321 Wirthensohn, Heinz242161 28.82
322 Djuric, Stefan242164 24.59
323 Kuijpers, Franciscus Antonius242164
324 Haygarth, Michael J242075
325 Ekstroem, Roland241973 23.77
326 Garcia, Gildardo241963 25.96
327 Pétursson, Margeir241956 20.04
328 Tischbierek, Raj241958 17.43
329 Ostermeyer, Peter241869 36.38
330 Tompa, Janos241756 32.83
331 Webb, Simon241759 30.72
332 Arnason, Jon L241755 19.29
333 Watson, John L241661 28.48
334 Zichichi, Alvise241666 41.65
335 Enklaar, Bertus F241663
336 Birnboim, Nathan241665 29.26
337 Ilic, Zoran241668 16.57
338 Brinck Claussen, Bjorn241659
339 Sideif Sade, Fikret I241471 28.16
340 Hase, Juan Carlos241362
341 Cvetkovic, Srdjan241361 34.00
342 Bielczyk, Jacek241355 27.02
343 Velikov, Petar241268 28.91
344 Hoelzl, Franz241255 33.90
345 Harandi, Khosro241260 29.49
346 Morris, Walter D241159 21.49
347 Dueckstein, Andreas241065 52.57
348 Pavlov, Mircea241063 42.46
349 Littlewood, John Eric241069
350 Augustin, Josef240955 37.78
351 Ciric, Dragoljub M240862 44.30
352 Jamieson, Robert Murray240865
353 Janoševic, Dragoljub240859 56.64
354 Franco Ocampos, Zenon240757 23.80
355 Pritchett, Craig William240570
356 Cámpora, Daniel H240366 22.66
357 Swic, Waldemar240358 26.96
358 Vilela, Jose Luis240255 26.94
359 Wittmann, Walter240263 31.95
360 Hoi, Carsten240256 23.12
361 Kestler, Hans-Günter240269 40.21
362 Emma, Jaime J240157 42.12
363 Van der Sterren, Paul240152 23.94
364 Gruenberg, Hans Ulrich240165 24.14
365 Bradford, Joseph M240068 29.33
366 Van Riemsdijk, Herman C240053 31.51
367 Bellin, Robert240054 27.66
368 Goodman, David SC239961
369 Bouaziz, Slim239857 29.87
370 Deze, Anton239874
371 Kristiansen, Jens239857 27.76
372 Cuartas, Carlos239762 39.54
373 Vaisman, Volodia239768 42.18
374 Biriescu, Ioan239672 26.34
375 Pokojowczyk, Jerzy239654 31.02
376 Segal, Alexandru Sorin239661 32.40
377 Law, Andrew P239666 29.64
378 Garcia Padron, Jose239669 21.93
379 Toth, Bela239658 36.86
380 Chandler, Murray G239556 19.90
381 Bohosjan, Sarkis239560 38.92
382 Nogueiras, Jesus239570 20.62
383 Hartoch, Robert G239561
384 Banas, Jan239455 32.74
385 Bronstein, Luis239456 33.74
386 Rakic, Tomislav239467 45.30
387 Despotovic, Momcilo239365 31.98
388 Haik, Aldo239265 27.36
389 Skrobek, Ryszard239257 28.65
390 Formanek, Edward W239167 37.81
391 Taylor, Timothy239170 27.05
392 Franklin, Michael J239071 49.07
393 Moehring, Guenther239054 43.26
394 Lombard, Andre239066 29.44
395 Short, Nigel D239057 14.74
396 Foygel, Igor238972
397 Welin, Thomas238968 20.48
398 Huss, Andreas238974 29.37
399 Sibarevic, Milenko238961 34.96
400 Hebert, Jean238857 22.30
401 Kagan, Shimon238754 37.90
402 Bellon Lopez, Juan Manuel238757 29.81
403 Fedder, Steen238659 28.71
404 Peev, Peicho Chonev238566 39.91
405 Jacobsen, Bo238575 31.21
406 Holm, Sejer238572 40.55
407 Littlewood, Paul E238459 24.11
408 Mascarinas, Rico238462 26.98
409 Bojkovic, Slobodan238375 34.59
410 Iskov, Gert238257 31.59
411 Szymczak, Zbigniew238261 28.15
412 Cappello, Renato238163
413 Adamski, Andrzej238063 41.13
414 Visier Segovia, Fernando238066 37.07
415 Ost Hansen, Jacob238074
416 Andre, Wolfgang237872 26.94
417 Lanka, Zigurds237769 19.77
418 Soos, Bela237770 49.97
419 Djukic, Zeljko237671 20.71
420 Meyer, E.237566
421 Cuasnicu, Oscar237566 37.35
422 Szilágyi, György237475 58.65
423 Gonsior, Evzen237457 48.23
424 Fedorowicz, John P237454 21.42
425 Van der Vliet, Fredrik237360
426 Cramling, Dan237369 21.06
427 Pavlovic, Dejan237371
428 Schinzel, Wladyslaw237252 36.77
429 Mišta, Ladislav237268 36.33
430 Paehtz, Thomas Sr237262 23.48
431 Garcia Palermo, Carlos237161 26.24
432 Olafsson, Helgi237157 23.54
433 Jamroz, Zbigniew237063 45.72
434 Watzka, Horst237065 41.46
435 Rigo, Janos236957 31.34
436 Rossetto, Héctor D236765 57.47
437 Coudari, Camille236765 28.58
438 Kaiszauri, Konstanty236755 27.34
439 Renman, Nils Gustaf236665
440 Horvath, Tamas236663 28.35
441 Neckar, Lubomir236565 29.57
442 Kengis, Edvins236473 20.88
443 Schellhorn, Wolfgang236476 31.52
444 Rajna, George236267 33.04
445 Filipowicz, Andrzej236264 41.79
446 Hebden, Mark236264 22.04
447 Niklasson, Christer236257 27.15
448 Whiteley, Andrew J236165 32.72
449 Gross, Stefan236059 30.50
450 Helmers, Knut J235963 23.06
451 Mortensen, Erling235961 24.90
452 Sikora Lerch, Jan235854
453 Filguth, Rubens A235863 23.92
454 Basman, Michael J235765 33.95
455 Odendahl, Steven M235662 20.34
456 Angantysson, Haukur235661 31.24
457 Balshan, Amikam235661
458 Kelecevic, Nedeljko235570 32.96
459 Rantanen, Yrjo A235363 29.85
460 Trois, Francisco RT235354
461 Nun, Jiri235267 22.59
462 Nikolic, Predrag235270 19.47
463 Fuller, Maxwell L235260 35.09
464 Maciejewski, Andrzej235063 28.64
465 Barreras, Alberto235064 28.90
466 Cooper, John Grantley234970
467 Wahlbom, Magnus234973 34.79
468 Day, Lawrence A234866 31.08
469 Ochoa de Echaguen, F Javier234875 25.48
470 deFirmian, Nicholas E234668 22.59
471 Lau, Ralf234669 20.36
472 Lebredo, Gerardo234563 29.57
473 Gutierrez, Jose Antonio234560
474 Lekander, Rolf234465 33.16
475 Sapi, Laszlo234467 44.94
476 Tomaszewski, Roman234363 19.79
477 Petran, Pal234356 33.45
478 Braga, Fernando234361 21.64
479 Orso, Miklos234159 23.72
480 Povah, Nigel E234059 27.62
481 Tichy, Vladimir234070 33.41
482 Giardelli, Sergio C233961 24.67
483 Baljon, Christofoor233959 26.68
484 Borm, Franciscus WM233968
485 Benjamin, Joel L233966 15.96
486 Ardiansyah, Haji233966 28.23
487 Van Baarle, C John233869 34.86
488 Frias, Victor J233873 24.05
489 Zoltek, Tadeusz233765 42.49
490 Gruchacz, Robert233670 26.25
491 Hvenekilde, Jorgen233667 44.50
492 Lieb, Harald233569 45.18
493 Camara, Helder233569 43.06
494 Ristic, Nenad233566 21.28
495 Golubovic, Zoran233571 21.20
496 Bernard, Ryszard233466 35.52
497 Svensson, Bengt233476 19.64
498 Bernat, Miguel233463 22.45
499 Aparicio, Anibal233372 32.70
500 Hesse, Peter233357 35.42

These ratings, calculated as of February 29, 1980, incorporate all games (against rated opponents) played in the time between March 1, 1979 and February 29, 1980, along with the ratings that were already calculated as of February 28, 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 February 29, 1980. This represents the player's estimated strength on March 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 March 1, 1980. The +/- value represents the standard deviation of that estimate; the player's true strength on March 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 March 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 February 29, 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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