Hmm ... question 21 is very difficult to follow. *pulls out his chess travel set, sets up the pieces* Let's see:
"Opgave 21
1. e4 e5 2. h4 h6 3. ?h3 ?h7 4. d3 f6 5. ?h5+ ?e7 6. a4 d5 7. ?g3 ?f5 8. ?xg7+ ?xg7 9. ?c3 ?f8 10. ?f3 ?g6
11. b3 c6 12. ?d2 ?a6 13. ?a3+ ?e7 14. ?b2 ?d6 15. ?e2 ?b4 16. ?a3 ?c5 17. ?e3 ?c8 18. ?c1 ?a2+ 19. ?xa2
?e7 20. ?f3 ?f5 21. ?xe5 ?d6 22. ?xg6+ ?f7 23. ?h5 ?e6 24. ?d1 ?h8 25. ?b2 ?a3 26. ?f4+ ?e5 27. ?c1 ?xc1+
28. ?xc1 ?hc7 29. ?a1 ?g8 30. ?b2 ?g7 31. ?e2 ?d4 32. ?b5++ ?c5 33. ?d2 ?xh4 34. exd5 cxb5 35. axb5
b6 36. ?e6+ ?xd5 37. ?e1 ?e8 38. Dd4#
Vul op de vraagtekens P, L, T, D en K in." (Fill in P, L, T, D and K on the question marks.)
This is difficult for me because I don't know what P, L, T, D and K are! In English notation, things are different: it's N (knight), B (bishop), R (rook), Q (queen) and K (king). *looks it up* OK ... so: in Dutch, it's K for koning (king), D for dame (queen), T for toren (tower/rook), L for loper (counsellor/bishop), and P for paard (horse/knight).
I'm pretty sure it goes like this:
1. e4 e5
2. h4 h6
3. Th3 Th7
4. d3 f6
5. Dh5+ Ke7
6. a4 d5
7. Tg3 f5
8. Txg7+ Lxg7
9. Pc3 Kf8
10. Pf3 ... and there's no piece that can go to g6. What's going on here?
As for question b (i.e. "Wie is de zwartspeler?" (Who is the black player?)), Sorry, I can't help you there. The only Dutch players I know of are
Max Euwe,
Hans Bouwmeester,
Jan Timman and
Ivan Sokolov ... and frankly, none of them would have played chess this badly!