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Tonbridge's Alex Chui Wins Perfect IMO Gold, Cambridge Bound

8/4/2026

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Summary

Story summary

Alex Chui, a Tonbridge School student, scored a perfect 100 percent (42/42) and won a gold medal at the International Mathematical Olympiad in Shanghai, his seventh consecutive medal.
Chui will begin studying mathematics at Cambridge University next term.
He posted a puzzle counting 3×3 grids whose rows and columns each multiply to 30, noting that 30 = 2 × 3 × 5 allows independent placement of the primes, giving 6 × 6 × 6 = 216 distinct grids.

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Story summary

Alex Chui, a Tonbridge School student, scored a perfect 100 percent (42/42) and won a gold medal at the International Mathematical Olympiad in Shanghai, his seventh consecutive medal.
Chui will begin studying mathematics at Cambridge University next term.
He posted a puzzle counting 3×3 grids whose rows and columns each multiply to 30, noting that 30 = 2 × 3 × 5 allows independent placement of the primes, giving 6 × 6 × 6 = 216 distinct grids.