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Top 10 active players as of April 30, 1979


Top 500 active players as of April 30, 1979

  #  

Player Rating +/- Best? 75%? Age
1 Karpov, Anatoly E27894947.7% #327.93
2 Korchnoi, Viktor L27574920.7% #648.10
3 Tal, Mikhail2733499.6% #1042.47
4 Portisch, Lajos2710504.3% #1642.07
5 Polugaevsky, Lev A2702503.0% #1944.44
6 Kasparov, Garry K2695533.0% #2316.05
7 Spassky, Boris V2683491.4% #2742.25
8 Tseshkovsky, Vitaly V2682501.3% #2834.60
9 Petrosian, Tigran V2682491.2% #2849.86
10 Vaganian, Rafael A2670500.6% #3527.54
11 Timman, Jan H2661480.4% #4027.38
12 Mecking, Henrique2657621.2% #4827.27
13 Vasiukov, Evgeny A2646550.4% #5246.15
14 Ljubojevic, Ljubomir2646490.2% #4928.49
15 Balashov, Yury S2646510.2% #5130.13
16 Smyslov, Vassily V2645500.2% #5158.10
17 Hübner, Robert2645500.2% #5130.48
18 Romanishin, Oleg M2645490.1% #5127.30
19 Lerner, Konstantin Z2643570.4% #5529.17
20 Hort, Vlastimil2641470.1% #5235.30
21 Geller, Efim P2641510.2% #5454.16
22 Ribli, Zoltán2639500.1% #5527.65
23 Larsen, Bent2638490.1% #5644.15
24 Tukmakov, Vladimir B2637500.1% #5733.12
25 Gulko, Boris F2637500.1% #5732.22
26 Beliavsky, Alexander G2632500.1% #6125.37
27 Gheorghiu, Florin2631500.1% #6135.07
28 Andersson, Ulf262747 #6427.84
29 Savon, Vladimir A2626530.1% #6838.59
30 Sveshnikov, Evgeny E2624500.1% #6829.22
31 Kavalek, Lubomir2624500.1% #6835.72
32 Kholmov, Ratmir D2623540.1% #7153.96
33 Ivanov, Igor V2621620.3% #7632.31
34 Krogius, Nikolay V2616710.6% #8748.77
35 Gligoric, Svetozar261550 #7656.24
36 Dorfman, Iosif D261250 #7826.99
37 Parma, Bruno2611570.1% #8437.33
38 Chekhov, Valery A2610660.3% #9023.43
39 Smejkal, Jan260450 #8533.11
40 Gufeld, Eduard E260455 #8843.11
41 Bagirov, Vladimir K260451 #8642.71
42 Kuzmin, Gennady P260350 #8633.28
43 Dzindzichashvili, Roman Y260351 #8734.98
44 Dvoretsky, Mark I2602590.1% #9231.39
45 Liberzon, Vladimir M260054 #9142.10
46 Bronstein, David I259852 #9155.20
47 Sosonko, Gennadi259749 #9135.94
48 Rashkovsky, Nukhim N259655 #9633.03
49 Gipslis, Aivars259456 #9842.23
50 Palatnik, Semen A2593610.1% #10229.09
51 Kurajica, Bojan259254 #9931.46
52 Sax, Gyula259150 #9727.86
53 Razuvaev, Yury S259152 #9833.55
54 Antoshin, Vladimir S2591680.1% #10949.95
55 Kochiev, Alexander259051 #9923.10
56 Sanguinetti, Raúl C2590640.1% #10746.24
57 Psakhis, Lev B2589590.1% #10520.42
58 Mikhalchishin, Adrian B258852 #10224.45
59 Miles, Anthony J258748 #9924.02
60 Uhlmann, Wolfgang258750 #10044.09
61 Unzicker, Wolfgang258756 #10553.84
62 Dolmatov, Sergey V258560 #11020.19
63 Panno, Oscar R258452 #10544.12
64 Tarjan, James E258353 #10827.19
65 Browne, Walter S258049 #10830.30
66 Szabó, László2578660.1% #12062.11
67 Makarichev, Sergey Y257653 #11325.45
68 Georgadze, Tamaz V257652 #11331.47
69 Averbakh, Yury L2574700.1% #12757.23
70 Marangunic, Srdjan2572710.1% #12935.50
71 Zaitsev, Igor A257262 #12340.92
72 Olafsson, Fridrik257153 #11844.26
73 Ivkov, Borislav257052 #11945.47
74 Kupreichik, Viktor D256954 #12029.82
75 Knaak, Rainer F256851 #12026.12
76 Lein, Anatoly256752 #12148.09
77 Timoshchenko, Gennady256753 #12230.01
78 Pfleger, Helmut256754 #12335.73
79 Byrne, Robert E256552 #12351.03
80 Zakharov, Alexander V256466 #13435.56
81 Tringov, Georgy P256460 #12942.15
82 Alburt, Lev O256352 #12533.69
83 Tseitlin, Mikhail S256255 #12731.87
84 Jussupow, Artur M256256 #12819.21
85 Suetin, Alexey S256155 #12852.46
86 Nemet, Ivan256162 #13336.04
87 Taimanov, Mark E256154 #12853.23
88 Stean, Michael F256151 #12625.65
89 Grigorian, Karen A256056 #13031.65
90 Kudriashov, Anatoly A2560700.1% #13937.04
91 Matanovic, Aleksandar255756 #13348.93
92 Csom, István255749 #12838.90
93 Lombardy, William J255654 #13341.40
94 Panchenko, Alexander N255556 #13425.57
95 Darga, Klaus V2555720.1% #14445.18
96 Ubilava, Elizbar E255267 #14428.68
97 Kapengut, Albert Z254858 #14234.82
98 Matulovic, Milan254855 #14043.88
99 Pachmann, Ludek254757 #14254.96
100 Zaltsman, Vitaly F254771 #15037.51
101 Klovans, Janis254661 44.06
102 Rogoff, Kenneth S254557 26.11
103 Vokác, Marek254474 20.40
104 Najdorf, Miguel254455 69.04
105 Bukic, Enver254354 41.41
106 Karasev, Vladimir I254274 40.86
107 Tseitlin, Mark D254275 35.60
108 Veingold, Aleksander254261 25.55
109 Shamkovich, Leonid A254154 55.91
110 Evans, Larry M254063 47.11
111 Luczak, Andrzej254061 30.40
112 Nikolac, Juraj254052 47.02
113 Díez del Corral, Jesús253863 46.07
114 Knezevic, Milorad253752 42.50
115 Adorján, András253749 29.08
116 Filip, Miroslav253565 50.51
117 Petrushin, Alexander I253366 32.14
118 Platonov, Igor V253270 45.28
119 Vogt, Lothar H253150 27.29
120 Vitolinš, Alvis253058 32.87
121 Nei, Iivo253058 47.50
122 Reshevsky, Samuel H253054 67.43
123 Hulak, Krunoslav252958 27.92
124 Hecht, Hans-Joachim252665 40.25
125 Velimirovic, Dragoljub252553 36.96
126 Nunn, John D M252553 24.01
127 Radulov, Ivan252554 40.31
128 Ree, Hans252249 34.62
129 Kaplan, Julio P252259 28.76
130 Zhuravliov, Valerij252169 40.39
131 Ivanov, Alexander V252157 22.99
132 Grefe, John A252062 31.65
133 Benko, Pal C251956 50.79
134 Peresipkin, Vladimir251959
135 Faragó, Iván251849 33.08
136 Gurgenidze, Bukhuti I251764 45.46
137 Petrosian, Arshak B251760 25.37
138 Faibisovich, Vadim Z251667 34.97
139 Yurtaev, Leonid251661 19.99
140 Sigurjónsson, Gudmundur251651 31.60
141 Biyiasas, Peter251554 28.45
142 Vukcevich, Milan R251573
143 Kovacevic, Vladimir251560 37.09
144 Piasetski, Leon David251563
145 Stoica, Valentin251367 29.21
146 Weinstein, Norman251257 28.57
147 Torre, Eugenio250951 27.49
148 Averkin, Orest N250865 35.18
149 Quinteros, Miguel A250850 31.34
150 Anikaev, Yury250764 30.83
151 Malaniuk, Vladimir P250771 21.78
152 Lutikov, Anatoly S250757 46.23
153 Bleiman, Yaacov250666 31.64
154 Malich, Burkhard G250653 42.42
155 Kharitonov, Andrey Y250473 20.07
156 Vukic, Milan250453 35.70
157 Kakageldyev, Amanmurad250360 29.34
158 Mariotti, Sergio250255 32.72
159 Schmidt, Wlodzimierz250251 36.05
160 Bilek, István250168 46.72
161 Lukin, Andrei M250166 30.67
162 Gavrikov, Victor N250062 21.75
163 Pintér, József250054 25.47
164 Regan, Kenneth249956 19.63
165 Stanciu, Traian249872 43.63
166 Schweber, Samuel249772 42.79
167 Garcia Martinez, Silvino249756 34.82
168 García Gonzáles, Guillermo249653 25.39
169 Yuferov, Sergey N249668 33.41
170 Prandstetter, Eduard249655 30.37
171 Peters, John A249655 28.22
172 Donner, Johannes H249654 51.82
173 Ftácnik, Lubomír249552 21.50
174 Christiansen, Larry M249452 22.84
175 Suba, Mihai249452 31.91
176 Hartston, William R249353 31.72
177 Ciocaltea, Victor249356 47.29
178 Lengyel, Levente249055 45.87
179 Seirawan, Yasser248963 19.10
180 Keene, Raymond248953
181 Simic, Radoslav248868 30.88
182 Schneider, Lars Ake248856
183 Lputian, Smbat G248661 21.21
184 Ungureanu, Emil248666 42.50
185 Jansa, Vlastimil248652 36.43
186 Padevsky, Nikola B248563 45.91
187 Sahovic, Dragutin248458 38.73
188 Ghizdavu, Dumitru248471 29.94
189 Diesen, Mark C248454
190 Robatsch, Karl248256 50.54
191 Ghinda, Mihail Viorel248154 29.76
192 Mednis, Edmar J248155 42.11
193 Kirov Ivanov, Nino248053 33.64
194 Marovic, Dražen248056 41.29
195 Zuckerman, Bernard248058 36.08
196 Lechtynsky, Jiri247954 31.43
197 Sanguinetti, Renato247970 63.02
198 Soltis, Andrew E247957 31.92
199 Bisguier, Arthur B247761 49.56
200 Jakobsen, Ole247662 36.53
201 Petkevich, Jusefs247662 38.36
202 Magerramov, Elmar S247667 21.05
203 Rodriguez, Amador247654 22.64
204 Zilberstein, Valery I247660 36.05
205 Lederman, Leon247569 31.92
206 Inkiov, Ventzislav247557 22.94
207 Hernandez, Roman247553 29.44
208 Szmetan, Jorge247454 28.92
209 Gaprindashvili, Nona247458 37.98
210 Tatai, Stefano247453 41.10
211 Calvo Minguez, Ricardo247463 35.52
212 Sofrevski, Jovan247371 43.70
213 Vadasz, Laszlo247352 31.26
214 Van Wijgerden, Cornelis247259 28.93
215 Commons, Kim S247260 27.77
216 Barczay, Laszlo247251 43.19
217 Plachetka, Jan247251 34.20
218 Spassov, Liuben247258 36.11
219 Marjanovic, Slavoljub247054 24.32
220 Godes, Dmitry R247069 39.76
221 Eingorn, Viacheslav S246975 22.43
222 Rajkovic, Dusan246957 36.86
223 Nikolic, Zivoslav246871 25.38
224 Forintos, Gyözö V246858 43.75
225 Podgaets, Mikhail Y246874 31.77
226 Westerinen, Heikki MJ246853 35.01
227 Piesina, Gintautas246762 27.06
228 Kraidman, Yair246766 46.50
229 Mestel, A Jonathan246653 22.13
230 Mnatsakanian, Eduard A246466 40.40
231 Karner, Hillar246266 43.76
232 Szekely, Peter246257 24.23
233 Popov, Luben246155 43.26
234 Hennings, Artur245967 38.80
235 Groszpeter, Attila245955 18.88
236 Vooremaa, Andres245962 34.78
237 Hug, Werner245956 26.64
238 Ligterink, Gert245852 29.45
239 Hazai, Laszlo245856 25.87
240 Atanasov, Petko245772 31.29
241 Rytov, Boris245761
242 Messing, Hrvoje245665 38.76
243 Martinovic, Slobodan245672 33.76
244 Gusev, Vladimir A245671
245 Poutiainen, Pertti245571
246 Estrin, Yacov B245475 56.03
247 Planinc, Albin245456 35.03
248 Langeweg, Kick245353 42.15
249 Horner, Jeff245375 29.68
250 Antunac, Goran245273 34.04
251 Clarke, Peter H245275
252 Rath, Ulrik245163 32.35
253 Todorcevic, Miodrag245167 38.47
254 Toth, Bela245162 36.03
255 Gutman, Lev245059 33.59
256 Ermenkov, Evgenij245055 29.59
257 Karaklajic, Nikola244962 53.18
258 Speelman, Jonathan S244954 22.58
259 Balinas, Rosendo Carrean244958
260 Espig, Lutz244950 30.32
261 Řgaard, Leif244957 27.32
262 Qi Jingxuan244962 31.47
263 Wedberg, Tom244860 25.43
264 Gruenfeld, Yehuda244863 23.17
265 Rogulj, Branko244866 27.75
266 Vladimirov, Evgeny Y244764 22.28
267 Sunye Neto, Jaime244757 21.99
268 Ghitescu, Theodor244655 45.27
269 Gerusel, Mathias244662 41.23
270 Barle, Janez244558 27.11
271 Portisch, Ferenc244454 40.06
272 Kozlov, V.244371
273 Malevinsky, Alexander A244373 29.18
274 Minev, Nikolay N244372 48.31
275 Raicevic, Vladimir244358 29.99
276 Minic, Dragoljub244374 42.15
277 Lukacs, Peter244151 28.81
278 Kuligowski, Adam244155 23.35
279 Hamann, Svend244063 38.56
280 Kuijpers, Franciscus Antonius243969
281 Castro Rojas, Oscar Humberto243955 25.97
282 Bohm, Hans243952 29.29
283 Mikenas, Vladas243963 69.04
284 Bertok, Mario243874 49.66
285 Rukavina, Josip243760 36.42
286 Sydor, Andrzej243771 42.32
287 Wirthensohn, Heinz243659 27.98
288 Pribyl, Josef243653 31.55
289 Garcia, Raimundo243668 42.92
290 Pomar Salamanca, Arturo243659 47.66
291 Zaichik, Gennady L243460 22.22
292 Pokojowczyk, Jerzy243456 30.19
293 Ivanovic, Božidar243253 32.68
294 Popov, Nikolay243267
295 Ornstein, Axel243156 27.02
296 Rohde, Michael A243164 19.68
297 Damjanovic, Mato243157 52.10
298 Mestrovic, Zvonimir243172 34.54
299 Matera, Salvatore Joseph242962
300 Borik, Otto242965 31.60
301 Rubinetti, Jorge A242965 34.08
302 Hoi, Carsten242958 22.29
303 Barcza, Gedeon242973 67.69
304 Eolian, Levon S242873 19.62
305 Williams, Arthur Howard242868
306 Kristiansen, Jens242856 26.92
307 Liebert, Heinz242859 42.93
308 Dely, Peter242860 44.82
309 Sloth, Jorn242865 34.65
310 Schussler, Harry242758 21.84
311 Ostojic, Predrag242757 41.19
312 Honfi, Karoly242660 48.51
313 Trapl, Jindrich242659 37.10
314 Donoso Velasco, Pedro H242667 35.18
315 Flesch, Janos242664 45.58
316 Kagan, Shimon242555 37.07
317 Adamski, Jan242351 35.47
318 Djuric, Stefan242262 23.76
319 Mascarinas, Rico242259 26.16
320 Velikov, Petar242265 28.08
321 Pytel, Krzysztof242263 33.95
322 Gofshtein, Leonid D242268 26.03
323 Skrobek, Ryszard242256 27.82
324 Kaiumov, Dmitry D242174 30.17
325 Ruderfer, Mark B242175
326 Cvetkovic, Srdjan242162 33.17
327 Goodman, David SC242166
328 Hase, Juan Carlos242061
329 Bönsch, Uwe242052 20.54
330 Janoševic, Dragoljub242057 55.81
331 Strauss, David J242070 32.73
332 Popovic, Petar241965 20.21
333 Sideif Sade, Fikret I241863 27.33
334 Biriescu, Ioan241774 25.51
335 Kosikov, Alexey I241672 30.18
336 Rocha, Antonio241661 34.87
337 Kaufman, Larry C241670 31.46
338 Doda, Zbigniew241565 48.19
339 Bednarski, Jacek B241556 40.13
340 Partos, Charles241569 42.72
341 Grinberg, Ricardo241566 31.29
342 Augustin, Josef241554 36.94
343 Hausner, Ivan241460 27.04
344 Garcia, Gildardo241459 25.14
345 Taulbut, Shaun M241455 21.30
346 Rossetto, Héctor D241369 56.64
347 Emma, Jaime J241361 41.29
348 Rodriguez Vargas, Orestes241361 35.82
349 Plaskett, Jim241363 19.12
350 Banas, Jan241354 31.90
351 Kestler, Hans-Günter241265 39.38
352 Watson, John L241262 27.65
353 Krnic, Zdenko241271 31.58
354 Spiridonov, Nikola241258 41.17
355 Georgiev, Krum241171 20.93
356 Bellon Lopez, Juan Manuel241153 28.97
357 Tompa, Janos241154 31.99
358 Bohosjan, Sarkis241159 38.09
359 Brinck Claussen, Bjorn241064
360 Webb, Simon240956 29.88
361 Zichichi, Alvise240975 40.82
362 Meduna, Eduard240856 28.64
363 Iskov, Gert240865 30.76
364 Bronstein, Luis240859 32.90
365 Vilela, Jose Luis240855 26.11
366 Jelen, Iztok240772 32.28
367 Bellin, Robert240659 26.83
368 Enklaar, Bertus F240673
369 Eslon, Jaan240474 27.15
370 Balshan, Amikam240458
371 Butnorius, Algimantas240471 32.44
372 Meyer, E.240468
373 Hoelzl, Franz240371 33.07
374 Sznapik, Aleksander240351 28.22
375 Morris, Walter D240262 20.66
376 Joksic, Sinisa240266 38.55
377 Chiburdanidze, Maia G240255 18.29
378 Nicevski, Risto240265 33.83
379 Franklin, Michael J240175 48.24
380 Zilberman, Nathan R240072 38.98
381 Littlewood, Paul E239963 23.28
382 Pritchett, Craig William239865
383 Bradford, Joseph M239868 28.50
384 Ilievski, Dimitar239667 37.68
385 Dobosz, Henryk239663 26.11
386 Evans, Larry D239575
387 Zwaig, Arne239568
388 Soos, Bela239472 49.15
389 Rigo, Janos239456 30.51
390 Sibarevic, Milenko239461 34.13
391 Cuartas, Carlos239466 38.71
392 Kolarov, Atanas S239475 45.16
393 Cuasnicu, Oscar239475 36.52
394 Debarnot, Roberto239363 31.73
395 Huss, Andreas239365 28.54
396 Filipowicz, Andrzej239363 40.96
397 Taylor, Timothy239265 26.22
398 Hartoch, Robert G239256
399 Dzuban, Oleg I239175
400 Vaisman, Volodia239167 41.35
401 van der Wiel, John T H239060 19.72
402 Silva, Fernando238974 28.74
403 Schinzel, Wladyslaw238957 35.93
404 Deze, Anton238965
405 Bukal, Vladimir Sr238868 39.50
406 Neckar, Lubomir238861 28.74
407 Spacek, Petr238872 25.18
408 Pétursson, Margeir238757 19.21
409 Bojkovic, Slobodan238766 33.76
410 Lombard, Andre238659 28.61
411 Whiteley, Andrew J238663 31.88
412 Kopec, Danny238572 25.17
413 Peev, Peicho Chonev238560 39.08
414 Lieb, Harald238565 44.35
415 Garcia Padron, Jose238462 21.10
416 Botterill, George Steven238456
417 Harandi, Khosro238474 28.66
418 Franco Ocampos, Zenon238366 22.96
419 Swic, Waldemar238357 26.14
420 Sisniega, Marcel238271 19.76
421 Jamieson, Robert Murray238166
422 Segal, Alexandru Sorin238155 31.57
423 Grigorov, Jordan N238172 25.39
424 Moehring, Guenther238053 42.43
425 Cappello, Renato238060
426 Nogueiras, Jesus238064 19.79
427 Taruffi, Daniele237974 20.65
428 Kozma, Julius237976 49.91
429 Ilic, Zoran237975 15.74
430 Pavlov, Mircea237964 41.63
431 Ambroz, Jan237866 24.86
432 Merdinjan, Agop237873 29.97
433 Helmers, Knut J237861 22.23
434 Lau, Ralf237863 19.53
435 Orso, Miklos237860 22.89
436 Niklasson, Christer237764 26.32
437 Littlewood, John Eric237772
438 Formanek, Edward W237764 36.98
439 Rajna, George237762 32.21
440 Visier Segovia, Fernando237659 36.24
441 Sikora Lerch, Jan237655
442 Hebert, Jean237665 21.47
443 Horvath, Tamas237659 27.52
444 Korsunsky, Rostislav R237573
445 Hesse, Peter237560 34.59
446 Van Riemsdijk, Herman C237555 30.68
447 Buljovcic, Ivan237567 42.34
448 Basman, Michael J237567 33.12
449 Kataev, V.237576
450 Wahlbom, Magnus237572 33.95
451 Kaiszauri, Konstanty237459 26.51
452 Haik, Aldo237362 26.53
453 Fedorowicz, John P237358 20.59
454 Van der Sterren, Paul237253 23.12
455 Szymczak, Zbigniew237169 27.32
456 Bouaziz, Slim236963 29.04
457 Kostro, Jerzy236970 42.26
458 Olafsson, Helgi236957 22.71
459 Akvist, Hakan236970 37.51
460 Mortensen, Erling236868 24.07
461 Baljon, Christofoor236658 25.84
462 Petran, Pal236558 32.62
463 Szilágyi, György236466 57.82
464 Law, Andrew P236470 28.81
465 Tischbierek, Raj236368 16.60
466 Van der Vliet, Fredrik236360
467 Fedder, Steen236265 27.87
468 Birnboim, Nathan236168 28.43
469 Ivarsson, Stefan236176 26.24
470 Shpilker, Boris236176 22.95
471 Maciejewski, Andrzej236175 27.81
472 Bielczyk, Jacek236157 26.19
473 Anelli, Antonio236070 34.96
474 Arnason, Jon L236059 18.46
475 Mihaljcisin, Mihajlo235969 46.19
476 Tisdall, Jonathan D235770 20.68
477 Steiner, Drako235671
478 Cámpora, Daniel H235564 21.83
479 Sapi, Laszlo235560 44.11
480 Garcia Palermo, Carlos235560 25.41
481 Sarapu, Ortvin235371 55.28
482 Flear, Glenn C235373 20.22
483 Coudari, Camille235371 27.75
484 Chandler, Murray G235259 19.07
485 Bjelajac, Milan235271 31.13
486 Cebalo, Mišo235276 34.23
487 Day, Lawrence A235263 30.25
488 Mishuchkov, Nikolai M235173 33.17
489 Lanc, Alois235172 31.20
490 Rayner, Emmanuel235173 20.88
491 Duric, Slavko235076 24.93
492 Krivonosov, Oleg234973 17.96
493 Rantanen, Yrjo A234857 29.02
494 Fichtl, Jirí234774 58.21
495 Frias, Victor J234665 23.22
496 Cooper, John Grantley234666
497 Kovacs, Laszlo M234654 40.57
498 Estevez Morales, Guillermo234568
499 Knox, Victor W234571 34.27
500 Zapata, Alonso234466 20.69

These ratings, calculated as of April 30, 1979, incorporate all games (against rated opponents) played in the time between May 1, 1978 and April 30, 1979, along with the ratings that were already calculated as of April 30, 1978. 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 April 30, 1979. This represents the player's estimated strength on May 1, 1979.

+/- 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 May 1, 1979. The +/- value represents the standard deviation of that estimate; the player's true strength on May 1, 1979 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 May 1, 1979. 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 April 30, 1979. 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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