White begins the game with the “king’s pawn” opening by moving pawn to E4. Blacks immidiately responds with the Sicilian defence chess opening and a fight for center control by moving pawn to C5.
This move leads to many opening variants, that can create complex positions. The PGN for the Sicilian defence is 1. d4 c5.
The dragon variant of Sicilian defense.
One of these variants of the Sicilian defense is the dragon variant. White moves knight to F3. Black immidiately fights for center control and puts pressure on white’s pawn on the E file by moving pawn to D6.
White moves pawn to D4. Black takes it by moving pawn to D4.
White takes pawn by moving knight to D4. Black moves knight to C3.
White moves knight to C3. Black moves pawn to G6.
These positions looks like a dragon. The PGN for the dragon variant of the Sicilian defense is 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6.
White might consider moving bishop to E3, bishop to E2, bishop to C4, pwn to G3 or pawn to E4. Black can move bishop to F2, attack white’s knight by moving knight to C6, attack white’s knight by moving pawn to E5 or move pawn to A6.
The Najdorf variant of Sicilian defense.
Another variant of the Sicilian chess opening is the Najdorf variant, which is the same as the dragon variant with the exception of the last move: White moves knight to C3 as in the dragon variant. Black moves pawn to A6.
The PGN of the Najdorf variant is 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6.
White will often move bishop to E3, bishop to F5, bishop to E2, bishop to C4, pawn to H3 or pawn to F3.
You might also want to study the Italian game chess opening.