THE HOLE

Any weak square in the Center is called as a Hole. The best piece to occupy a Hole is a Knight because it can control many squares remotely.

Sample Game:
W: D.Janowski
B: A.Kupchik
Havana International Masters Tournament, 1913
1. d4 d5
2. c4 e6
Queens Gambit Declined
3. Nc3 Nf6
4. Bg5 Be7
5. e3 Nbd7
6. Bd3 dxc4
7. Bxc4 Nb6
Black aims to occupy d5 with his N, but this is passive. Better move for Black is c7-c5 attacking White's pawn center.
8. Bd3 Nfd5
9. Bxe7 Qxe7
10. Nf3 0-0
11. 0-0 Bd7
12. Rc1 
White has nicely developed his pieces
12. ....c6
13. Ne4 f5?
This is a positional mistake since it weakens the e5 square
14. Nc5 Be8
15. Ne5
White N's have occupied the holes on c5, e5 and dominate the position
15. .... Rb8
Waste of time, Rc8 was better
16. Re1 Rf6
17. Qf3 Rh6
18. Qg3 Rc8
19. f3 Rc7
20. a3 Kh8
21. h3 g5
22. e4 f4
23. Qf2 Ne3
Better move was Nf6 planning Nd7
24. Rxe3! fxe3
25. Qxe3 Nc8
26. Ng4 Rg6
27. e5 Rg7
28. Bc4 Bf7
29. Nf6 Nb6
30. Nce4
White prepares for the final King side attack
30. .... h6
31. h4 Nd5
32. Qd2 Rg6
33. hxg5 Qf8
34. f4 Ne7
35. g4 hxg5
36. fxg5 Black Resigns
1-0
More about Holes on ChessStrategies