Gabriel Goh Hao Xiang

Category: maths olympiad

  • IMO 2025

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    Gabriel Goh
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    “Live-solve” / Solution walk-through Have not been spoiled on the problems, but I have been spoiled on the scores, so I can roughly guess the difficulty of this paper. Day 1 (0h5m) First thoughts: CGN and the geom looks weird. Actually the FE looks weird also. Not much else to think about (0h10m) I tried…

  • 2025 Senior Q2

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    Gabriel Goh
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    Q2 of this year’s S(ingapore)MO Senior Round 2 was my proposal (so is Q3 but that one isn’t very interesting), and I just wanted to share a little about the problem development process. Anyways. One day I was looking at a geom solution that involves radius zero circles, and I thought it would be fun…

  • Ranking ISL problems by popularity

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    Gabriel Goh
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    What is the most popular ISL problem in the last decade? People like to discuss about which is the best problem in a contest, specifically from the IMO shortlist (ISL), but that usually ends up in an argument about what even makes a problem “better” – there are so many factors to consider and everyone…

  • IMO 2024 Day 2

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    Gabriel Goh
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    Was tough doing this in camp, but I’m finally done. It’s rare to see someone’s thought process for an entire paper, so here’s mine – hopefully it’s sufficiently entertaining. Needless to say, spoilers below. Here we go again! (0h0m) First thoughts: Ok GCA. Is that an FE?! What kind of word is aquaesulian? Why is…

  • IMO 2024 Day 1

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    Gabriel Goh
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    A lot of spoilers below. Stuck in camp, doing the entire paper on my Learnet. Here are the ramblings of a guy with insufficient sleep (may contain mistakes): (0h0m) First thoughts: Q1 looks very standard, like a mix between a junior olympiad question and a classical problem. Q2 also looks pretty standard, although the "for…

  • The Story of SEIF

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    Gabriel Goh
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    (And how I accidentally “proposed” an IMO5) It’s been almost two and a half years since, and yet if you asked me for my most unique and memorable experience, there is a good chance I would still mention this story. It takes more than a healthy dose of idealism for 16-year-old me to wake up…

  • “This probably works”

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    Gabriel Goh
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    Advice(?) mainly for consistent Q2/5 solvers. The way I viewed Math Olympiad and contest problems changed a lot from 2022 to 2023. I think this change of strategy really worked for me, so I want to pen it down before I forget. Imagine yourself with 2 progress bars, one for knowledge and one for intuition.…