Bigbadwolf vs Artem92. 9-kyu was right!

Here is the recent game from USA vs Europe match -
very exciting one!

We will discuss just one move - White 212
It was necessary to make a decision and Artem made a big mistake -
he ignored the threat.

The chat was funny:

oatCheese [2k]: cant ignore this
gryn [1d?]: w should ignore, no?
Lion [1k]: ingore.
Lion [1k]: ignore
illusion53 [1d]: n19 not really ko
GoatCheese [2k]: w would get shredded
shiff [5k]: ignore
toofou [6k?]: cant ignore
illusion53 [1d]: since k17 is sente
lobo [-]: no need to ignore
matroid [5k]: cut
shiff [5k]: wny can't?
gacua [1d]: white doesn't need to ignore
lobo [-]: lots of threats for w
chrpa [1d]: d7
yuca [9k]: I don't think W can ignore.
toofou [6k?]: ignore = exchange i guess
Cassis0 [5d]: can't ignore
Javaness [-]: no need to ignore
toofou [6k?]: cant ignore
gacua [1d]: why ignores?
GandalfTW [2k]: w has other good threats
Javaness [-]: plenty of big threats left

As "yuca" noticed White cannot ignore that threat.
He cannot save his group on the left, after Black plays twice, because the
central adji is too bad.
It was better to answer the threat!
I added some variations and proved that White was winning.

Poor Artem ... He lost a very good position ...