Chess has not been solved in the sense of ...
Yeah, I'll stop you right there -- there's only one "sense" of solved, and it's not what the very best players "know".
You misquote me. I did not say the best players know the game is "solved". [because they don't]
I said "The best players make the very reasonable assumption that chess is a draw when neither side makes a mistake."
To date, there's no forced win for white, or black, for that matter.
That's about all we can assert with certainty.
But the game remains damn easy to lose. We all do that, regularly.