Hello, sorry take your time.
I think the problem was that he played very slow and solid in the opening, compared to the opponent’s moyo. But I don’t have sure.
The san-san in the double wing formation was a good choice?
And after that, how to attack and reduce de moyo after move 27?
I’m White, thank you very much!
1-26:
Normal opening, Black is playing a bit more defensive / solid than White.
27:
Black plays tengen and claims a big moyo.
28-37:
White goes for territory on the left side and Black for a large centre moyo.
38:
White reduction feels like an overplay.
39-41
The Black tenuki (39) gives White an opportunity to start building something in the centre …
but White answers with a pincer (40) after which black walks into the centre (41).
40 is a big move, but sometimes big moves are not enough.
The series 27-41 was decisive.
42-97:
White discovers that Black’s thickness in the centre makes it very difficult to create a living group there. White struggles for a few dozen more moves and resigns.
Instead of White K3 (40) he should have walked out of the centre and secure his stones.