Ranka recently reported that the World Amateur Go Championship used the MacMahon system for its pairing algorithm ( http://ranka.intergofed.org/?p=12658 ). This pairing algorithm was originally named after Lee McMahon ( https://en.wikipedia.org/wiki/Lee_E._McMahon ). From what I understand, he used this approach in a sort of club ladder setting in New York, whilst the British Go Association used it in a tournament setting, to replace Swiss. This is used by some to suggest that the name of this system should be McMahon. However the German player Christopher Gerlach, has a computer program called MacMahon. As this is the definitive version of the pairing algorithm, I believe that he suggests it is correct to now use MacMahon, even if he should perhaps have called his program McMahon in the first instance. This is because not all pairing algorithms are the same. (I am not entirely sure what the difference is between some FIDE standard of Swiss and McMahon, but I take it that there is some genuine important difference.)

A further complication is that McMahon, MacMahon, and indeed M'Mahon, are all effectively equivalent when you look back through time. Whether you want to call it the Ellis Island effect, or just say that it is was styled according to the fashion of the times, it really boils down to the same thing. Johnny may have chosen to write M'Mahon, but he could have equally written McMahon, or added an extra a like the Priest did. This of course mirrors the confusion in 1970s Europe over how M*Mahon should be written, with official BGA publications regularly using MacMahon.

Of course today, everyone LOVES standardisation, or is that standardization, so which should it be?

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North Lecale

The BGA has for a very long time now only used McMahon as the name, although errors cropped in the early days.

If Christoph's program were the only one then I might suggest change, but it isn't.

I'd consult Geoff Kaniuk before asserting anything was definitive in this area.

BTW I love standards too - there are just so many of them to choose from...

What OS does Christoph’s program run on? If it’s a Mac, then it would seem quite natural to me to name it “MacMahon”.

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“The only difference between me and a madman is that I’m not mad.” — Salvador Dali ★ Play a slooooow correspondence game with me on OGS?

I always assuned it's MacMahon in UK and McMahon in Ireland..

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If something sank it might be a treasure. And 2kyu advice is not necessarily Dan repertoire..

I assume I saw both spelling McMahon and MacMahon, but never really noticed.
Both are equivalent to me in this case, although I probably prefer MacMahon.

The funny sthing about standards is that they are often only as meaningful as your ability to either enforce them or entice people to use them.

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- Bantari
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WARNING: This post might contain Opinions!!

maybe we need to make a new standard that encompasses all the others.
https://xkcd.com/927/