Sicilian Defense: Hyperaccelerated Pterodactyl, Exchange Variation is a chess opening with the ECO code B27, part of the Sicilian Defense family. It goes 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. dxc5 Qa5+ 5. Nc3 Bxc3+ 6. bxc3 Qxc3+. White opens with 1. e4 (the king's pawn) and Black answers 1... c5. After 12 moves it is White to move. The lesson on the board explains every move of the line and lets you play it yourself; it is free.
The moves
1. e4 – White plays the pawn to e4
1... c5 – Black plays the pawn to c5
2. Nf3 – White plays the knight to f3
2... g6 – Black plays the pawn to g6
3. d4 – White plays the pawn to d4
3... Bg7 – Black plays the bishop to g7
4. dxc5 – White captures on c5 with the d-pawn
4... Qa5+ – Black plays the queen to a5, giving check
5. Nc3 – White plays the knight to c3
5... Bxc3+ – Black takes on c3 with the bishop, giving check
6. bxc3 – White captures on c3 with the b-pawn
6... Qxc3+ – Black takes on c3 with the queen, giving check
About the Sicilian Defense
Black answers 1.e4 with 1...c5, fighting for the d4 square from the side. The game becomes unbalanced and sharp, with chances for both sides.
After d4 and ...cxd4, Black trades a side pawn for White's centre pawn and gets an extra centre pawn.
Black uses the half-open c-file: a rook on c8 and pressure on c3 and c2.
Kings often castle on opposite sides, so both players race to attack; every tempo counts.
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