Almost the end of the game
The diagram shows the game after the players have stopped playing.
We see the neutral territory points (1,2,3,4). They can be filled by either black or white (non pieces participating in the game).
The pieces marked with triangles are dead pieces (no chance of forming solid territory). They are removed from the board and placed together with captured ones.
Pieces removed and neutral spaces filled
End of the game
The pieces that are on the board are rearranged to facilitate counting.
The captured pieces are placed on the territory of the same color, also to facilitate the final count.
Now just count the intersections that are not filled by parts. If you don't remember, see here how to count.
And finally, Black wins by 20 to 16.