Level 4

1 2

3 4

5 6

7 8

9 10

11 12

13 14

15 16

17 18

19 20

21 22

23 24

25 26

27 28

29 30

Notes

In number 23, Black also had another move order which was equally good, starting with 1...Nxf3+.

In number 27, White found a spectacular sacrifice, which was the only move that doesn't actually lose the game. Afterwards, his rook is a so-called furious piece, basically forcing Black to stalemate him.