They were processed and the PGNs are still here:

https://www.chessgames.com/nodejs/g...

https://www.chessgames.com/nodejs/g...

... but they are now no longer viewable:

Elias van der Hoeven vs von der Lasa, 1851

Elias van der Hoeven vs von der Lasa, 1851

Just curious - does "no longer" imply there once were viewable?

Odd. No mention of Ware's three matches against Young in 1885.

1st Match: Ware beats Young, +7=1-4
2nd Match: Young beats Ware, +10=0-7
3rd Match: Young beats Ware, +10=2-7

Rod originally used a handful of select secondary sources. Only later did he gain the guidance of more experienced historically oriented researchers, e.g. Tim Harding and many others.

So, I think a snowballing effect happened, and he started gaining more and more qualified research contributors - and so more and more primary sources.

I think he got a lot of British and European guidance at first, and so it's not surprising to me that the American matches were missed.

Here's Rod's accounting:

<<Sources>

The results of matches and tournaments I used came from a number of sources. I relied heavily on Jerry Spinrad's collection of results, which he posted on the web, originally on the Avler Chess Forum, but now available here. (In case this becomes unavailable, I have taken the liberty of saving a copy of this document and it is available here.) These cover the period 1836-1863. He used several sources which are in many cases contradictory. In such cases, I usually took the more conservative result (the one closer to a 50-50 score) unless it seemed pretty clear that one was right (in some cases for example, drawn games might sometimes be omitted from the score, in which case, we wish to include them). In a few cases, the results were so wildly different in different sources that I excluded them altogether.

The other primary sources were Vols. 1 & 2 [& 3 & 4 (Feb. 2016)] of Jeremy Gaige's Chess Tournament Crosstables (along with Anders Thulin's extremely useful name index for Gaige's volumes) and the recent Chess Results, 1747-1900 and Chess Results, 1901-1920 [and Chess Results, 1921-1930 (Feb. 2016), Chess Results, 1931-1935 (May 2021), Chess Results, 1936-1940 (Nov. 2022), and Chess Results, 1941-1946 (Feb. 2024)], by Gino Di Felice. Gaige's was for many years the most definitive collection of tournament results for the nineteenth and early twentieth centuries. Gino Di Felice has attempted to improve on it, including even more tournament crosstables as well as match results. He has been partially successful, and this is a very valuable addition to the field of chess history, but he has apparently been a little less careful in some respects than might have been hoped, so that some results have to be treated with caution. An interesting (and largely encouraging) critique by Taylor Kingston appeared at the Chess Café site on the internet and I have found other errors or questionable information. A number of supposed 'matches' between Anderssen and other German players are included, some of which may not have been genuine matches, even of a casual kind. For example, the infamous Eichborn-Anderssen games are listed, totalling 28 games with a score of 27.5 - 0.5 in Eichborn's favour. But these games were recorded by Eichborn and it seems highly likely that he simply kept his few wins out of a great many casual games they played over a long period. I have not included these 'matches', nor several other dubious-looking match results of Anderssen's.

...

I also consulted Kuiper's Hundert Jahre Schachturniere and Hundert Jahre Schachzweikampfe. The results of the former are almost all covered by Gaige, who is probably more accurate, and thence Di Felice. The match results of the latter are also included in Di Felice. The Italian web site, ' La grande storia degli scacchi', I found useful as a check, and a source for the occasional minor event not covered in the main sources.

Then I consulted a number of standard reference works, including the encyclopaediae of Sunnucks and Golombek, as well as both editions of the excellent Oxford Companion to Chess by Hooper and Whyld. I also used a few other miscellaneous books, such as Staunton's book on the London 1851 tournament and Wade's Soviet Chess (where the Petrov-Baranov match of 1809 is mentioned [actually Petrov-Kopiev (June 2013)]).

Finally, I used reputable-looking internet sites to add some more obscure results here and there, including sites for American, Irish and German chess history for example. Particularly notable is the fantastically rich 'The Life and Chess of Paul Morphy' site by 'Sarah' and several of the columns at ChessCafé.

[I have now been through a number of other sources, including books, periodicals, and web sites. References are now included on the player pages, as well as on the event pages. (Added Jan. 2010)]>

http://www.edochess.ca/Edo.explanat...

You'll notice a mention of he-who-must-not-be-mentioned, with similar concerns.

Rod is primarily a mathematician, and not a chess historian. I imagine he is relying on the community for input and guidance, and not combing the primary sources himself.

You might consider contacting him, he is responsive and a rather nice fellow (from what I can tell).

He certainty has a very high quality website.

http://www.edochess.ca/Contributors...

As I said, his contributors have far out-stripped his initial sources.

I'm sure the <Ware//Young> stuff would be quickly incorporated into EDOchess if brought to his attention.

(Gotta love it)

With the possible exception of the two unknowns, Szabo is one of the youngest at 30 yo.