The change in 3.x numbering from C21 to C22 is explained on my page Zonals : Links (and Other References). A special analysis is needed for Africa. Although the overview looks consistent, much of the data for zones 4.1, 4.2, and 4.3 is missing. The current data is filled with placeholders.
Next on the docket: the Asian and African continents, zones 3.x & 4.x.
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Later: Re the question on C16 Z2.5, I'm certain that zone 2.4 was split for the following cycle, C17, although I can't find a direct mention. The Interzonal for C17, the 1997 FIDE Knockout Matches, lists five players from zones 2.3, 2.4, and 2.5. Garcia,Gild (COL) and Hernandez,Gi (MEX) qualified from San Salvador zt 1995 (Z2.3). Granda Zuniga,J (PER) and Milos,G (BRA) qualified from Z2.4 Sao Paulo (see Zonals 1995-1997, C17). Morovic (CHI) qualified from Santiago zt 1995 (Z2.5).
For cycles 16 and later, I created a similar table for the European continent, i.e. zones numbered 1.x. Not shown in the table are the first continental championships that replaced the zonals starting in cycle 20.
After analyzing these results, I'll tackle the American continent, zones 2.x.
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Later:
(zonals with more than one event; see INF57 for more crosstables)
C16 Z1.1:
1.1a Dublin;
1.1b Brussels;
1.1c Lisbon
C16 Z1.2:
1.2a Graz;
1.2b Zagreb
C16 Z1.4:
combine -> 1.4-A&B Budapest 1993-03
C16 Z1.5:
1.5a Zouberi;
1.5a' Kladovo;
1.5b Protvino
C16 Z1.7:
1.7a Vilnius;
1.7b Nikolaev;
Why two?
C18 Z1.7:
1.7? Tallinn;
others?
C19 Z1.6:
1.6-1 Moscow 1999;
1.6-2 Samara (53rd RUS chp) 2000
Notes:
C16 Z1.5: see note EK esp. 'playoff was in Athens'; Zouberi zt 1993; Kladovo zt 1993; 1993 Biel FIDE IZ: 15 Sokolov I GM BOS (how qualified?), 19 Abramovic B GM FIDE (Wikipedia: '1st at Kladovo 1993'), 39 Kozul Z GM BOS (1.2b Zagreb), 51 Nikolic P GM BOS (how qualified?)
C18 Z1.7: Zone 1.7 - J. Ehlvest (EST), D. Fridman (LAT), E. Rozentalis (LTU); Tallinn zt 1998 (Fridman, Rozentalis)
C19 Z1.6: 2000 FIDE Knockout Matches - RUS 16 players; Moscow 1999-12 - Sakaev, Bezgodov; Samara 2000-06 - Volkov, Kharlov, Rustemov; how did others qualify?
Although the format of the updated table, shown below, is substantially the same as the previous version, there is one important difference: the cycle numbering I use to keep the data together differs for 1997 and after (see Zonals, Current Cycles, and GM Kamsky for the reason I did this).
Just as I did the last time I created the table, I'll step through it methodically to investigate the anomalies, fix those that are errors, and document those that are the result of valid reasons.
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Later: (zonals with more than one event)
C05 Z02: 2-1 (annulled) Berg en Dal; 2-2 Marianske Lazne
C05 Z09: 9-1 (East subzone) Sydney; 9-2 (West subzone) Madras; 9f Madras
C06 Z04: 4(qualifier) Leningrad (USSR chp); 4(zonal) Moscow
C10 Z03: 3 (1/2/3:C) Vraca; 3 (1/2/3:D) Pula; 3 playoff? Arandjelovac (Arandelovac)
C13 Z01: 1A Brighton; 1B Montpellier; 1C Barcelona (Castelldefels)
C13 Z02: 2A + playoff +TB Beersheba; 2B + playoff Gausdal; 2S (tnmt for Swiss seed) Zurich
C14 Z01: 1A Bath; 1B Budel; 1C Andorra
C14 Z02: 2A Munich; 2B/14 Gausdal
C14 Z03: 3A Warsaw; 3B Warsaw [no playoff]
C15 Z01: 1A Blackpool; 1B Lyon; 1C Yebenez
C15 Z03: 3A +playoff Stara Zagora; 3B +playoff Stara Zagora [no playoff]
C15 Z08: 8 Cali; 8 subzonal? Pinar del Rio CUB [delete]
Notes:
C10 Z03:
Arandjelovac zt playoff;
IZ Biel - Smejkal;
IZ Manila - Uhlmann;
Adorjan tied for 1st-3rd but did not play IZ
C14 Z03:
IZ Subotica - Sax;
IZ Szirak - Marin;
IZ Zagreb - Pinter, Inkiov
C15 Z03:
IZ Manila - Ftacnik, Georgiev, Marin, Stohl
