It may not be the best move since the engine proposed something diffrent after longer thought. But why is it even good? Isn’t this just a wasted tempo?
I think it’s good because of the large difference in material and space imbalance. White isn’t just up a minor piece, this is a Q vs R position where white already holds much more space than black. When white is up material and black effectively has no pawns off the starting line, there’s not much white can improve other than it’s own king activity/placement. Kh2 is the natural attacking progression that is also the best ‘waiting for black to make a wrong move’ move if that makes sense. Hope this helped clarify. (FTR I probably wouldn’t have found Kh2 despite now seeing why it’s certainly best)
why what, the last move or move arrow
Stockfish and RubiChess agree that Qb3 is the best move. RubiChess (blue arrows) is only considering attacking while Stockfish (green arrows) has Kh2 and Kh1 in its top moves (+6.25 and +6.99 versus +6.57 for Qb3).
I think the general idea is that the black rook on e8 implies the strategy to get that rook to e1. The move Kh2 avoids that check.
I don’t really find that argument convincing myself. White is clearly ahead so just increase the pressure and black will probably have no time for a counterattack anyways.
