Hi, it's supposed to be Grünfeld (I think that's the right thing), but in english we don't have such a thing and the equivalent to the ü is ue, so Gruenfeld.
Is it the gruenfeld or the grunfeld?

My books on the Grunfeld both have it spelled Grunfeld, but with the two dots over the " u " . When you cant put the two dots there its usually spelled Gruenfeld. I guess both spellings are acceptable.

ERNST GRUENFELD (born Nov-23-1893, died Apr-03-1962) Austria |
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Ernst Franz Grünfeld was born on the 23rd of November 1893 in Vienna, Austria. He lost a leg in an early childhood which was beset by poverty. However, he discovered chess, studied intensely, and quickly earned a reputatation as a skilled player at the local chess club, the Wiener Schach-Klub.
Awarded the GM title in 1950, he was German Champion in 1923. For a short period after the First World War he was among the World's best eight or nine players. His best tournament results were Meran 1924 1st ahead of Rudolf Spielmann and Akiba Rubinstein, Budapest 1926 1st with Mario Monticelli ahead of Rubinstein, Richard Reti and Savielly Tartakower, Vienna 1928 1st with Sandor Takacs and 1st at Mahrisch-Ostrau 1933. He played for Austria in four Olympiads from 1927 to 1935 but is best known as an openings theoretician and published a book on the Queen's Gambit in 1924. The Grunfeld (D80) Defense, one of the hypermodern openings, is named after him. He introduced this opening to the world by defeating Alexander Alekhine with it in 1922. See Alekhine vs Gruenfeld, 1922. He passed away in Vienna in 1962.
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My books on the Grunfeld both have it spelled Grunfeld, but with the two dots over the " u " . When you cant put the two dots there its usually spelled Gruenfeld. I guess both spellings are acceptable.
"Umlaut" -> "Americanization of"
You spell (and write) grünfeld as "gruenfeld" because in english the sound of "ue" is similar to the close front rounded vowel (y) represented by the ü.

My books on the Grunfeld both have it spelled Grunfeld, but with the two dots over the " u " . When you cant put the two dots there its usually spelled Gruenfeld. I guess both spellings are acceptable.
"Umlaut" -> "Americanization of"
You spell it "gruenfeld" because in english the sound of "ue" is similar to the close front rounded vowel (y)
Actually I think that it's also allowed in German, if you can't write the umlaut for some reason, then ue is acceptable. So probably the same rule was just used in English.

My books on the Grunfeld both have it spelled Grunfeld, but with the two dots over the " u " . When you cant put the two dots there its usually spelled Gruenfeld. I guess both spellings are acceptable.
"Umlaut" -> "Americanization of"
You spell it "gruenfeld" because in english the sound of "ue" is similar to the close front rounded vowel (y)
Actually I think that it's also allowed in German, if you can't write the umlaut for some reason, then ue is acceptable. So probably the same rule was just used in English.
If you are referring to '96 Reform, I must admit that I don't remember this as a rule; instead, some "e" are turned in "ä", while ß is usually replaced. If you are talking about common "speaking", or chatting, with a qwerty keyboard, I can't disagree.

just out of interest, is it always possible to get a gruenfeld defence against the English opening, or if white plays something else after playing c4, his position will be bad? Thanks

just out of interest, is it always possible to get a gruenfeld defence against the English opening, or if white plays something else after playing c4, his position will be bad? Thanks
Against some white move orders in the English black cannot play Gruenfeld, which is why I quit relying on it as my main defense against Q-side openings. 1 c4 Nf6 2 Nc3 g6 3 e4 and black cannot play gruenfeld lines now.
Do you spell it the grunfeld or the gruenfeld?