Why these moves?

Hey all, reading "How to play the English Opening, by Povah and this is one of the starting games. Have a few questions on it. Any help appriciated.

13...Ke8  Why worry since about the c5 pin since c5 ends up killing White's pawn structure?

17...Kh7  No other move? 

21...dxc  Doesn't Black loses center pawn structure with this? Why not allow White to take instead?

23...exd  Why not take towards center? Gives e file away

25...Qg5  Setting for what?

Writing this now, I see that all my questions are based on Black, who lost, but he's a Gradmaster so he had to have been thinking something with these moves.

Thanks in advance --- Jim

OK since no one is answering you, I shall.

13... Ke8 to get out of the pin.

17... Kh7 protects g6 and h6 pawns or knight checks but also the king looks a bit safer taking it off the a1 - h8 diagnol since white's bishop is on it.

21... dxc5 takes a momentarily free pawn but also opens up the queen to expose the weak pawn on d3.

23... exd5 because if cxd5 blacks position becomes very blocked up and also the pawn on c7 would be taken leaving black exposed for attack on the queenside.

25... Qg5 develops the queen to attack on the king side and also threatens Nxg3 fxg3 Qxg3+ winning material.

I fail to see how 32... Nf6 draws the game after 33. Bxe6 :/

I didn't look at the game so this is not a specific answer to your question, but perhaps adopting the attitude "why not these moves?" would be benificial to your chess. A move doesn't always have to accomplish something tangible.

Studying the extremely complex and slow positional games of Andersson is not a good idea for beginners, the plans are just to complex.

You have good ideas about what moves should be doing, such as making threats and watching your pawn structure, so just my two cents but I wouldn't recommend aiming for closed games of which the English will bring you a lot.  In these positions there are different ideas to work with and moves sometimes are much more patient/subtle... not replacing what you know now, but they go along with it... so learn all you can with open and semi-open games first ;)

But to answer your question in a different way from what they've said, even without any tactical justification all the moves you asked about made sense in a very general way which could be summed up as white's play is on the queenside and black's is on the kingside.  Both players were playing to their strength/the other's weakness.