The story
German locates the virtue in the body: whoever can stay seated, wins. English borrowed the word whole; chess writers have leaned on sitzfleisch for decades when talent alone won't finish the job. The plain word underneath is stamina.
ZITS-flysh[ˈzɪtsˌflaɪʃ]
Pronunciation: Jeuwre · CC BY-SA 4.0 · Wikimedia Commonsthe ability to sit still until the job is done — sheer stamina
Closest in English: stamina, perseverance, persistence. None of them covers it.
German locates the virtue in the body: whoever can stay seated, wins. English borrowed the word whole; chess writers have leaned on sitzfleisch for decades when talent alone won't finish the job. The plain word underneath is stamina.
Contains the answers. If you want to play the word yourself first, leave this closed.