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Top 10 active players as of April 30, 1973

  #  

Player Rating +/-
1 Fischer, Robert J289653
2 Karpov, Anatoly E273249
3 Korchnoi, Viktor L271849
4 Tal, Mikhail271748
5 Spassky, Boris V271149
6 Portisch, Lajos270748
7 Stein, Leonid Z269951
8 Petrosian, Tigran V269349
9 Polugaevsky, Lev A268749
10 Geller, Efim P268350

About these ratings

Top 500 active players as of April 30, 1973

  #  

Player Rating +/- Best? 75%? Age
1 Fischer, Robert J28965396.6% #130.14
2 Karpov, Anatoly E2732490.9% #1021.93
3 Korchnoi, Viktor L2718490.5% #1242.10
4 Tal, Mikhail2717480.5% #1336.47
5 Spassky, Boris V2711490.4% #1436.25
6 Portisch, Lajos2707480.2% #1536.07
7 Stein, Leonid Z2699510.2% #1838.47
8 Petrosian, Tigran V2693490.1% #1943.86
9 Polugaevsky, Lev A2687490.1% #2138.44
10 Geller, Efim P2683500.1% #2248.16
11 Hübner, Robert2679510.1% #2424.48
12 Larsen, Bent266649 #2938.15
13 Smyslov, Vassily V266349 #3052.10
14 Byrne, Robert E265452 #3545.03
15 Tukmakov, Vladimir B264550 #3927.12
16 Hort, Vlastimil263847 #4129.30
17 Keres, Paul263751 #4457.31
18 Savon, Vladimir A263550 #4532.59
19 Furman, Semen A263353 #4752.41
20 Mecking, Henrique263154 #4821.27
21 Smejkal, Jan263048 #4727.11
22 Krogius, Nikolay V263056 #5042.77
23 Grefe, John A262967 #5425.65
24 Gligoric, Svetozar262748 #4950.24
25 Vasiukov, Evgeny A262150 #5440.15
26 Kavalek, Lubomir261849 #5429.72
27 Ljubojevic, Ljubomir261548 #5622.49
28 Olafsson, Fridrik261358 #6238.26
29 Bronstein, David I261350 #5949.20
30 Balashov, Yury S261150 #6024.13
31 Gipslis, Aivars261055 #6336.23
32 Suetin, Alexey S260753 #6446.46
33 Uhlmann, Wolfgang260548 #6338.09
34 Lein, Anatoly260354 #6842.09
35 Dvoretsky, Mark I260158 #7125.39
36 Kuzmin, Gennady P260053 #7027.28
37 Schmid, Lothar M259861 #7544.97
38 Panno, Oscar R259750 #7038.12
39 Averbakh, Yury L259659 #7651.23
40 Taimanov, Mark E259651 #7147.23
41 Browne, Walter S259550 #7124.30
42 Kholmov, Ratmir D259451 #7347.96
43 Vaganian, Rafael A259351 #7421.54
44 Gufeld, Eduard E259152 #7637.11
45 Szabó, László258949 #7556.11
46 Sanguinetti, Raúl C258963 #8340.24
47 Reshevsky, Samuel H258351 #8161.43
48 Benko, Pal C258150 #8344.79
49 Dzindzichashvili, Roman Y258155 #8528.98
50 Gheorghiu, Florin258048 #8229.07
51 Andersson, Ulf257947 #8221.84
52 Nezhmetdinov, Rashid G257874 #9860.37
53 Tseshkovsky, Vitaly V257857 #8928.60
54 Liberzon, Vladimir M257860 #9136.10
55 Unzicker, Wolfgang257154 #9347.84
56 Ivkov, Borislav257047 #9039.47
57 Najdorf, Miguel256951 #9363.04
58 Klovans, Janis256959 #9838.06
59 Pachmann, Ludek256661 #10248.96
60 Planinc, Albin256550 #9529.03
61 Evans, Larry M256456 #10141.11
62 Darga, Klaus V255956 #10439.18
63 Razuvaev, Yury S255953 #10327.55
64 Matulovic, Milan255850 #10137.88
65 Podgaets, Mikhail Y255856 #10525.77
66 Ribli, Zoltán255649 #10321.65
67 Mukhin, Mikhail A255454 #10825.20
68 Gurgenidze, Bukhuti I255363 #11439.46
69 Csom, István255249 #10632.90
70 Bagirov, Vladimir K255255 #11136.71
71 Nei, Iivo255259 #11341.50
72 Parma, Bruno255049 #10831.33
73 Lombardy, William J254759 #11735.40
74 Velimirovic, Dragoljub254551 #11430.96
75 Pfleger, Helmut254153 #11829.73
76 Hecht, Hans-Joachim254149 #11634.25
77 Kapengut, Albert Z254055 #12128.82
78 Gulko, Boris F253873 #13226.22
79 Ciric, Dragoljub M253564 #13037.47
80 Kupreichik, Viktor D253565 #13023.82
81 Commons, Kim S253465 #13221.77
82 Matanovic, Aleksandar253351 #12542.93
83 Beliavsky, Alexander G253260 #13119.37
84 Karasev, Vladimir I253261 #13234.86
85 Grigorian, Karen A253259 #13025.65
86 Filip, Miroslav253153 #12844.51
87 Zhidkov, Valery S253162 #13433.65
88 Adorján, András253149 #12523.08
89 Romanishin, Oleg M253063 #13421.30
90 Platonov, Igor V252957 #13239.28
91 Díez del Corral, Jesús252854 #13140.07
92 Zaitsev, Igor A252862 #13634.92
93 Dementiev, Oleg I252873 #14235.33
94 Lutikov, Anatoly S252757 #13440.23
95 Murey, Yakov252670 #14231.74
96 Etruk, Rein T252574 #14535.11
97 Antoshin, Vladimir S252155 #13843.95
98 Bilek, István252149 #13340.72
99 Donner, Johannes H251948 #13545.82
100 Osnos, Viacheslav V251960 #14237.77
101 Radulov, Ivan251949 34.31
102 Kurajica, Bojan251753 25.46
103 Karner, Hillar251759 37.76
104 Hartston, William R251652 25.72
105 Kovacevic, Vladimir251559 31.09
106 Addison, William G251568 39.42
107 Marovic, Dražen251552 35.29
108 Quinteros, Miguel A251449 25.34
109 Nikolaevsky, Yuri V251165
110 Shamkovich, Leonid A251155 49.91
111 Palatnik, Semen A251161 23.09
112 Suttles, Duncan250754 27.36
113 Bobotsov, Milko G250552 41.58
114 Timman, Jan H250448 21.38
115 Jansa, Vlastimil250449 30.43
116 Tseitlin, Mark D250460 29.60
117 Kraidman, Yair250155 40.50
118 Teschner, Rudolf250070 51.21
119 Bukic, Enver250056 35.41
120 Rogoff, Kenneth S249964 20.11
121 Forintos, Gyözö V249750 37.75
122 Sosonko, Gennadi249556 29.94
123 Padevsky, Nikola B249454 39.91
124 O'Kelly de Galway, Albéric249358 61.95
125 Malich, Burkhard G249251 36.42
126 Minic, Dragoljub249152 36.15
127 De Fotis, Gregory249168 21.39
128 Soltis, Andrew E249063 25.92
129 Schmidt, Wlodzimierz249051 30.05
130 Karaklajic, Nikola248860 47.18
131 Tarjan, James E248764 21.19
132 Ciocaltea, Victor248649 41.29
133 Keene, Raymond248350
134 Zilberstein, Valery I248256 30.05
135 Rodriguez, Ruben248170 26.40
136 Rashkovsky, Nukhim N248159 27.03
137 Maric, Rudolf248071 45.96
138 Antunac, Goran247963 28.04
139 Dueball, Juergen247854 28.09
140 Schweber, Samuel247855 36.79
141 Mikenas, Vladas247670 63.04
142 Ree, Hans247648 28.62
143 Shereshevsky, Mikhail I247676 23.03
144 Barczay, Laszlo247558 37.19
145 Lengyel, Levente247550 39.87
146 Tringov, Georgy P247452 36.15
147 Georgadze, Tamaz V247360 25.47
148 Ghitescu, Theodor247352 39.27
149 Kaplan, Julio P247354 22.76
150 Stean, Michael F247256 19.65
151 Buljovcic, Ivan247267 36.34
152 Sigurjónsson, Gudmundur247159 25.60
153 Sax, Gyula247050 21.86
154 Barcza, Gedeon246957 61.69
155 Byrne, Donald246961 42.88
156 Tatai, Stefano246949 35.10
157 Pomar Salamanca, Arturo246750 41.66
158 Anikaev, Yury246570 24.83
159 Zuckerman, Bernard246557 30.08
160 Torre, Eugenio246451 21.49
161 Pilnik, Herman246455 59.31
162 Pribyl, Josef246451 25.55
163 Espig, Lutz246453 24.32
164 Yanofsky, Daniel A246459 48.09
165 Amos, Bruce M246368 26.33
166 Dely, Peter246356 38.82
167 Ubilava, Elizbar E246374 22.68
168 Radev, Nikolai246274 34.36
169 Hamann, Svend246156 32.56
170 Estrin, Yacov B246161 50.03
171 Minev, Nikolay N246157 42.31
172 Enklaar, Bertus F246151
173 Popov, Luben246154 37.26
174 Ghizdavu, Dumitru245956 23.94
175 Alburt, Lev O245965 27.69
176 Sveshnikov, Evgeny E245967 23.22
177 Rossetto, Héctor D245853 50.64
178 Spiridonov, Nikola245856 35.17
179 Nemet, Ivan245768 30.04
180 Rytov, Boris245662
181 Damjanovic, Mato245651 46.10
182 Moe, Mogens245573 29.13
183 Hug, Werner245451 20.64
184 Smederevac, Petar245474 50.68
185 Doroshkievich, Vladimir K245462 35.34
186 Rukavina, Josip245452 30.42
187 Schauwecker, Meinrad245368 22.12
188 Johannessen, Svein245361 35.54
189 Kuijpers, Franciscus Antonius245362
190 Bogdanovic, Rajko245264 41.46
191 Calvo Minguez, Ricardo245253 29.52
192 Botterill, George Steven245161
193 Jansson, Borje245156 31.13
194 Zuidema, Coenraad245053
195 Balshan, Amikam245069
196 Bertok, Mario245066 43.66
197 Biyiasas, Peter244955 22.45
198 Messing, Hrvoje244964 32.76
199 Penrose, Jonathan244959 39.56
200 Gerusel, Mathias244855 35.23
201 Sofrevski, Jovan244859 37.70
202 Vranesic, Zvonko244763 34.57
203 Cvetkovic, Srdjan244666 27.17
204 Torán Albero, Román244361 41.56
205 Basagic, Zlatko244373 25.37
206 Moiseev, Oleg L244176 47.98
207 Stanciu, Traian244172 37.63
208 Mišta, Ladislav244168 29.50
209 Nikolic, Stanimir244174 38.26
210 Lehmann, Heinz Dr243958
211 Faragó, Iván243957 27.08
212 Garcia, Raimundo243952 36.92
213 Cosulich, Roberto243960
214 Knezevic, Milorad243860 36.50
215 Hennings, Artur243752 32.80
216 Liebert, Heinz243753 36.93
217 Weinstein, Norman243672 22.57
218 Vooremaa, Andres243669 28.78
219 Rakic, Tomislav243575 38.47
220 Bisguier, Arthur B243553 43.56
221 Cortlever, Nicolaas243564 57.87
222 Westerinen, Heikki MJ243549 29.01
223 Makarichev, Sergey Y243560 19.45
224 Kuindzhi, Alexander243561
225 Mednis, Edmar J243460 36.11
226 Bleiman, Yaacov243471 25.64
227 Suess, Alois243462 29.88
228 Robatsch, Karl243357 44.54
229 Saidy, Anthony F243151 35.95
230 Plachetka, Jan243054 28.20
231 Mariotti, Sergio243058 26.72
232 Williams, Arthur Howard243059
233 Brinck Claussen, Bjorn243071
234 Hase, Juan Carlos242856
235 Ojanen, Kaarle Sakari242875
236 Rossolimo, Nicolas242864 63.17
237 Cuasnicu, Oscar242860 30.52
238 Capelan, Guenter242761 40.76
239 Vukic, Milan242657 29.70
240 Langeweg, Kick242650 36.15
241 Kestler, Hans-Günter242657 33.38
242 Kirov Ivanov, Nino242566 27.64
243 Bednarski, Jacek B242550 34.13
244 Sliwa, Bogdan242372 51.24
245 Kozma, Julius242363 43.91
246 Sahovic, Dragutin242270 32.73
247 Estevez Morales, Guillermo242255
248 Ostojic, Predrag242254 35.19
249 Haag, Ervin242160 40.30
250 Krnic, Zdenko242063 25.58
251 Honfi, Karoly241854 42.51
252 Christoph, Manfred241865 41.92
253 Peretz, Malkiel241859 29.88
254 Rodriguez Vargas, Orestes241854 29.82
255 Janoševic, Dragoljub241752 49.81
256 Nowak, Erwin241673
257 Szmetan, Jorge241556 22.92
258 Foguelman, Alberto241568 49.55
259 Ermenkov, Evgenij241556 23.59
260 Zwaig, Arne241464
261 Ungureanu, Emil241358 36.50
262 Kolarov, Atanas S241267 39.16
263 Řgaard, Leif241158 21.32
264 Jakobsen, Ole241155 30.53
265 Kosanski, Stanko241073 31.53
266 Drimer, Dolfi240971 38.54
267 Ek, Hans240964 44.57
268 Flesch, Janos240869 39.58
269 Clarke, Peter H240766
270 Hernandez, Roman240766 23.44
271 Haygarth, Michael J240775
272 Dueckstein, Andreas240672 45.74
273 Spassov, Liuben240664 30.11
274 Campos Lopez, Mario240458 29.95
275 Debarnot, Roberto240455 25.73
276 Eising, Johannes240460 37.91
277 Toth, Bela240458 30.03
278 Scholl, Eddie C240454 28.54
279 Myagmarsuren, Lhamsuren240356 35.20
280 Jiménez Zerquera, Eleazar240362 44.84
281 Siaperas, Triantafyllos240262 40.75
282 Cobo Arteaga, Eldis240254
283 Cuéllar Gacharná, Miguel240156 56.45
284 Korensky, Valeri S240163
285 Ujtumen, Tudev240157 33.68
286 Nicevski, Risto240058 27.83
287 Doda, Zbigniew240052 42.19
288 Gaprindashvili, Nona240063 31.98
289 Gilden, Lawrence C240069
290 Bohosjan, Sarkis239860 32.09
291 Liljedahl, Lennart239856 25.68
292 Pytel, Krzysztof239751 27.95
293 Portisch, Ferenc239762 34.06
294 Markland, Peter R239753 22.05
295 Chellstorp, Craig V239665
296 Porat, Yosef239663 63.89
297 van Scheltinga, Tjeerd D239557 59.15
298 Ilievski, Dimitar239468 31.68
299 Martz, William E239455
300 Vadasz, Laszlo239359 25.26
301 Ornstein, Axel239161 21.02
302 Cuartas, Carlos239160 32.71
303 Blau, Max239173 54.36
304 Schiffer, Karl Josef239070
305 Lechtynsky, Jiri239058 25.43
306 Kinnmark, Ove239063 28.35
307 Rubinetti, Jorge A239052 28.08
308 Soos, Bela238965 43.15
309 Friedman, Shmuel238963
310 Belmonte, Juan S238971
311 Lundin, Erik238871 68.83
312 Littlewood, John Eric238769
313 Ivanovic, Božidar238763 26.68
314 Rajkovic, Dusan238657 30.86
315 Boey, Josef238565 38.95
316 Tompa, Janos238569 25.99
317 Rocha, Antonio238473 28.87
318 Filipowicz, Andrzej238455 34.96
319 Barle, Janez238462 21.11
320 Pedersen, Eigil238464
321 Kostro, Jerzy238352 36.26
322 Hartoch, Robert G238350
323 Mestrovic, Zvonimir238370 28.54
324 Adamski, Jan238353 29.47
325 Vujacic, Borivoje238267 23.63
326 Kupka, Slavoj238265 30.81
327 Geller, Uzi238265 42.26
328 Karklins, Andrew238263 26.04
329 Bukal, Vladimir Sr237863 33.50
330 Czerniak, Moshe237857 63.24
331 Muco, Fatos237669 24.04
332 Olsson, Ake237661 38.98
333 Bhend, Edwin237567 41.64
334 Kristiansen, Erling237460 36.37
335 Pritchett, Craig William237461
336 Corden, Martyn J237368
337 Basman, Michael J237374 27.12
338 Akvist, Hakan237363 31.51
339 Betancort Curbelo, Juan237371 30.71
340 Zinn, Lothar237359 35.11
341 Kagan, Shimon237254 31.07
342 Peev, Peicho Chonev237156 33.08
343 Fichtl, Jirí237159 52.21
344 Mititelu, Gheorghe237067 38.50
345 Jankovec, Ivan237071 34.54
346 Vogt, Lothar H237053 21.29
347 Pelikán, Jorge236960 67.02
348 Naranja, Renato236858 32.60
349 Masic, Ljubomir236857 36.82
350 Sydor, Andrzej236656 36.32
351 Pedersen, Karl236670 32.59
352 Trapl, Jindrich236666 31.10
353 Poulsson, Eivind236569 30.40
354 Deze, Anton236559
355 Wright, Daniel236572
356 Roehrl, Karl236465 32.30
357 Bellin, Robert236457 20.83
358 Kaldor, Avraham236460 25.94
359 Sloth, Jorn236463 28.65
360 Kovacs, Laszlo M236463 34.57
361 Mueller, Klaus Uwe236365
362 Knaak, Rainer F236355 20.12
363 Balcerowski, Witold236363 37.72
364 Piasetski, Leon David236275
365 Brostrom, Goran236269 31.01
366 Pavlov, Mircea236266 35.63
367 Kluger, Guyla236269 59.29
368 Partos, Charles236162 36.72
369 Belkadi, Ridha236166 48.01
370 Wirthensohn, Heinz236160 21.98
371 Hohler, Peter236063 32.05
372 Shaw, Terrey Ian236070
373 Richter, Ka236072
374 Wade, Robert Graham235954
375 German, Eugenio Maciel235969
376 Eley, Brian235956
377 Hlousek, Zdenek235972
378 Holm, Sejer235856 33.72
379 Puc, Stojan235861 52.06
380 Klundt, Klaus235775 31.35
381 Garcia Martinez, Silvino235552 28.82
382 Van Riemsdijk, Herman C235559 24.68
383 Maciejewski, Andrzej235567 21.81
384 Schoeneberg, Manfred235556 26.82
385 Shabanov, Yury F235574 35.47
386 Uddenfeldt, Dan235565 22.09
387 Emma, Jaime J235457 35.29
388 Jacobsen, Bo235466 24.38
389 Baumbach, Friedrich235161 37.64
390 Harandi, Khosro235163 22.66
391 Saren, Ilkka J235163 32.95
392 Gasiorowski, Ryszard235169 37.38
393 Bachtiar, Arovah235067 39.10
394 Whiteley, Andrew J235063 25.88
395 Denker, Arnold S235065 59.19
396 Hazai, Laszlo235065 19.87
397 Jongsma, Alexander234965 34.91
398 Webb, Simon234863 23.88
399 Pustina, Ylvi234763
400 Nagy, Ervin234762 27.75
401 Bellon Lopez, Juan Manuel234753 22.97
402 Levy, Louis234771 52.22
403 Medina García, Antonio A234651 53.58
404 Quinones, Oscar Carillo234662
405 Brond, Victor234670
406 Levy, David Neil Lawrence234660
407 Witkowski, Stefan234573 41.59
408 Gasic, Bozidar234568 35.55
409 Fuller, Maxwell L234470 28.26
410 Kunsztowicz, Uwe234258 29.28
411 Mestel, A Jonathan234259 16.13
412 Pietrusiak, Bogdan234262 39.79
413 Cafferty, Bernard234260 38.84
414 Serwinski, Benedykt234172
415 Kanko, Ilkka234075 38.44
416 Polgar, Istvan233961 28.43
417 Vila Dupla, Aurelio233768 14.01
418 Kushnir, Alla233761
419 Tan Lian Ann233559
420 Krabbe, Tim233570 30.05
421 Romm, Meir233564 33.85
422 De Greif, Boris233468 43.21
423 Szilágyi, György233462 51.82
424 Visier Segovia, Fernando233259 30.24
425 Van Geet, Dirk Daniel233263 41.16
426 Kaufman, Larry C233267 25.46
427 Palermo, Vicente233264 41.13
428 Moehring, Guenther233162 36.43
429 Reicher, Emanoil233164 43.09
430 Zichichi, Alvise233062 34.82
431 Cibulka, Vladimir232862 31.50
432 Carvalho, Herbert Abreu232765 18.58
433 Banas, Jan232656 25.90
434 Camara, Helder232557 36.23
435 Mikhalchishin, Adrian B232576 18.45
436 Troianescu, Octav232564 57.23
437 Van Baarle, C John232461 28.03
438 Domnitz, Zadok232463 39.54
439 Garcia, Horacio232371
440 Zoltek, Tadeusz232167 35.66
441 Grabczewski, Romuald232061 41.23
442 Gereben, Ernö232059 65.86
443 Poch, Cesar Guillermo231961
444 Friedgood, David231872 26.80
445 Sznapik, Aleksander231853 22.22
446 Miles, Anthony J231771 18.02
447 Cardoso, Radolfo Tan231754
448 Kristinsson, Jon231758 30.86
449 Rebizzo, Cayetano231769 64.73
450 Sumiacher, Carlos231668
451 Franzen, Jozef231567 27.23
452 Cornelis, Frans B231471 31.32
453 Borngaesser, Rene231474 21.61
454 Manasterski, Lutoslaw231461 36.22
455 Skalkotas, Nikolaos231464 23.61
456 Schaufelberger, Heinz231359 25.45
457 Bronstein, Luis231363 26.90
458 Moles, John231265 23.61
459 Janetschek, Karl231166 33.04
460 Lombard, Andre230955 22.61
461 Perkins, Alan H230975 24.11
462 Silva, Fernando230964 22.74
463 Hoen, Ragnar230964 32.57
464 Van den Berg, AMJ.230966
465 Juarez, Carlos Eleodoro230661 34.83
466 Estimo, Samuel230573
467 Nordstrom, Felix230372 28.90
468 Van Seters, Frits230366
469 Casas, Fernando230361 46.69
470 Franklin, Michael J230267 42.24
471 Wagman, Stuart230168 53.95
472 Ujtelky, Maximilián230165 58.03
473 Menvielle Lacourrelle, Augusto230066 34.72
474 Boersma, Paulus A229965 24.79
475 Garcia, H.229969
476 Pinto Paiva, Jose229975
477 Wotulo, Max229962 40.73
478 Rodriguez Cordoba, Jesus R229867 23.87
479 Agdamus, Jose Luis229770
480 Petersen, Finn229670 33.01
481 Nowak, Ignacy229573 24.30
482 Toth, Peter229374 32.65
483 Littleton, Michael Flannan229274
484 Ghinda, Mihail Viorel229273 23.76
485 Wibe, Terje229059 25.57
486 Meduna, Eduard229076 22.64
487 Sarapu, Ortvin228965 49.28
488 Ardiansyah, Haji228956 21.40
489 Leskovar, Mario228963 22.55
490 Belliard, Luis228765
491 Fappas, Joannis228676
492 Behling, Robert228676 25.83
493 Gasztonyi, Endre228665
494 Chemin, Vitorio228574 22.97
495 Novak, Ivan228460 30.26
496 Eperjesi, Laszlo228465 29.95
497 Durao, Joaquim228463 42.51
498 Osterman, Rudolf228462 26.78
499 Nobrega, Adaucto da228371
500 Taha, A.228071

These ratings, calculated as of April 30, 1973, incorporate all games (against rated opponents) played in the time between May 1, 1972 and April 30, 1973, along with the ratings that were already calculated as of April 30, 1972. 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, 1973. This represents the player's estimated strength on May 1, 1973.

+/- 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, 1973. The +/- value represents the standard deviation of that estimate; the player's true strength on May 1, 1973 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, 1973. 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, 1973. 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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