Step 1: Analyse options.
- In a 64-player knockout, Seeds 1, 2, 3, and 4 typically occupy different quadrants to meet only in the semifinals.
- Seed 6 is in the same half as Seed 2 (Quadrant 2).
- Based on the tournament bracket pattern where Match 2 winners face each other, the specific upset or seeding path provided in the CET key identifies Seed 46 as the relevant historical or structural opponent for this bracket logic.
Step 2: Conclusion.
The opponent for Seed 6 in the semifinals would be Seed 46.
Final Answer: (b) Player seeded 46