Here’s a game I played with white in the Sicilian Defense which really shows how the Sicilian is a double-edge defense.
1. e4 c5
2. Nf3 Nc6
3. d4 cxd4
4. Nxd4 Nf6
5. Nc3 e6
6. f3 a6
7. Bc4 Bb4
8. Nxc6 bxc6
9. Bd2 d5
Here I should have gone for e5 which prevents d5. An old say is that if in the Sicilian Black can execute d5 without having problems, then it’s a good position for him.
10. Bb3 O-O
11. Qe2 a5
12. a3 Ba6
13. Qf2 Bd6
14. O-O-O Qe7
15. Bg5 Bxa3
Here’s the fatal error: I don’t have to capture the bishop back, I can play e5 and attack the pinned knight.
16. e5 h6
Another error, he should have gone for Qb3 which attacks my knight since the bishop pins the pawn defending it.
17. exf6 gxf6
18. Bxh6 Rfb8
Now it’s even a mate in two, I’ll let you spot it before showing it.
19. Qg3+ Kh7
20. Qg7# 1-0