Hello everybody!
It's not difficult to see that in the position below from A.Brito Garcia-B.Kurajica, Las Palmas 1994
with Black to move there's no win, as the black knight cannot expel the white king from both f1 and f2, as a knight can't lose a tempo. For the two squares f1 and f2 I'd like to suggest the term "double square" / "
Doppelfeld" with the meaning "complex of squares where a piece can freely oscillate between without being bothered by zugzwang". So one could easily rephrase the description given above by "the black knight cannot expel the white king from the double square f1/f2" (or even shorter "f12"), or in German
der weiße Springer kann den schwarzen König nicht vom Doppelfeld f12 vertreiben.
The two squares don't need to be adjacent; in the well known fortress
the black rook oscillates between d6 and f6, resp. on the "double square" df6.
(Both positions are from Nunn's book "Understanding Chess Endgames", p. 87 and p. 197)
Do you find this term useful? Does anybody have a better suggestion for the notion described above? Are there languages which already employ a similar expression?
---------------------
After being back from my holidays, I still didn't find the time to complete my presentation about prerevolutionary chess terminology in France, and also my overview about "chess terminology worldwide". One of these days ...
At least I learned that I can tick Twi (spoken in Ghana) off my list; a Ghanaen chess player told me they would use the english expressions. Not really a surprise ...
Best regards,
Zwischenzugzwang