Home › Openings › Sicilian Defense › Sicilian Defense: Pin Variation Sicilian Defense: Pin Variation, Koch Variation ECO B40 · 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Bb4 6. e5 Related variationsSicilian Defense: Pin Variation, Jaffe Variation Practice this opening · Play against the computer