Why is 14....Rhg8 an inaccuracy?


The computer criticizes many moves and labels them as "inaccuracies", when they are actually decent moves. Rhg8 is a fine move; however, the engine prefers a more "precise" way of playing by utilizing Bg4 and e4 ideas (where an h3 countershot on the bishop could run into Bxh3! and a more deadly opening of the g-file). Don't always take the engine analysis so hard, because you are a human, not a calculation machine! Personally, I would make sure to look deeper into engine lines to uncover how the computer precisely transforms the position into a strategic win.

Your move was fine, good enough for a large advantage.
The computer prefers ...Bg4 instead because the threat of ...e4 is vey tough to meet without creating serious weaknesses.
And anyway, after the bad move 14.g3? it doesn't matter anymore if the previous move was "best" or not- Black is winning quite easily.