FIFA 2026 bracket predictor – see live crowd % as picks come in

Name: FIFA 2026 bracket predictor – see live crowd % as picks come in
Availability: InStock
Author: apostophet

by apostophet·Jun 27, 2026·1 point·1 comment

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AI Analysis

●●SolidBig BrainNiche Gem

Parsed FIFA's actual regulations PDF when AI kept hallucinating the third-place seating rules.

Strengths

•495-row official lookup table implementation beats AI hallucination on bracket rules
•Bipartite matching fallback for incomplete brackets shows real engineering thought
•Live crowd percentages with no sign-up required is clean UX

Weaknesses

•Bracket predictors are common — only the FIFA rules parsing differentiates it
•Tied to single event; unclear if this becomes reusable infrastructure

Post Description

Built this on top of a side project (quizzy.earth).

The interesting engineering problem was the best-thirds seating logic – FIFA pre-publishes a 495-row lookup table (Annexe C) covering every possible combination of third-place qualifiers. AI kept hallucinating bracket rules so I ended up reading the actual regulations PDF. Each of the 495 scenarios has up to 24,000 valid bracket arrangements; FIFA pre-commits to one per scenario so there's no ambiguity on the night.

For a half-finished bracket I fall back to bipartite matching (seat the most-constrained team first). The moment all 8 thirds are chosen it switches to the official lookup.

No sign-up. Anonymous picks. Curious what HN thinks the brackets looks like.