"Mar-10-15 scassislusor:
Dufresne's "Little Textbook of Chess" continues to be published (German, of course) in its 31st edition at least; about 760 pages, with 78% of content devoted to openings with 130 illustrative games. After Dufresne died in i893 (12 years after first edition), Jacques Mieses was given the editorial work which lasted till 1954. After that Rudolf Teschner edited it until his death in 2006. I don't know who may have taken over. It has been and remains what I think is the best 1 volume reference since started in 1881."

<offramp: User: KIRKO created today's Pun. I'm afraid I don't understand it.>

Really?!

You do know Britney Spears song, right?
"Dufresne", has a striking resemblance to "again", ok, with just a little imagination and flexibility. Then there is the line "I played with your heart and lost in the game", which aligns perfectly with playing a game of chess, and making the losing mistakes.

So!

I had a high school classmate by that surname, and he definitely pronounced it thus.

I already said what IMHO is a good pun, now let's apply it to an example. Below standard is certified by HISPIDU and ISO. A good pun includes:

<(a) An element of the game.
* 1 point if it does NOT reference one of the players' names but score, result, opening, location, etc.>
Here 0.

<(b) A good external reference.
* 1 point if is stand-alone (so not "Dzindzi Vitus"), not too cryptic, not too long, etc.>
Here 0. Britney Spears, come on.

<(c) An ingenious connection between the two.
That's the most important part and where most puns fail.
* 1 point if the link between (a) and (b) is strong: the reference makes sense and it's not just a title coming from nowhere.
* 1 point if the link is ingenious e.g. a good play on words.
* 1 point at the discretion of the Jury.>
Here it should be 0 but since the pun allowed us to see this game, the Jury magnanimously gives 1 point.
It would have gained another one if Jean Dufresne had already won against Daniel Harrwitz, but it's the only game between the two players.
Total 1 out of 5 possible.

No offence.

"Oops!... I Did It Larsen"

runs into the issue that it is LARsen, not larSEN. Similarly for CARLsen, as for most Scandinavian names ending on "-sen" (meaning "-son"). Emphasis is not on the last syllable.

Hmm...User: sfm. Did you know that directly south of Denmark there is a country called, in English, <Germany>?

Did you know that a lot of the German people speak German?

Poor old Jean Dufresne was German. He was born in Berlin. He spoke and wrote and read in German. He had a German moustache. He died in Berlin.

He wasn't French.

Have a look at YouTube to see Germans saying the name <Dufresne>. They say the name in a similar was to the name <Disney>

I just realised you are a very recent member here. First, welcome. Second, congrats for having your pun selected within one day. Some users wait for years. So far the record is held by User: FSR with over 12 years (cf. P Acs vs Vachier-Lagrave, 2008 (kibitz #6)).

Did you know that a lot of the German people speak German?>

I have been away from Denmark for some time, but now that you say it, yes! It does ring a bell, and makes good sense.

<He had a German moustache.> I recall over time seeing some pictures of a man with such a thing. Maybe that was Dufresne.

"Jean Dufresne" sounds to me as French as anything gets, but it will have been modified for local use.

After spending some hours thinking about it, I agree - it may not in either country have sounded quite like "again".