techrul.github.io

My personal site and a home for my projects. Live at techrul.github.io.

Projects

Different sports, different rankings

techrul.github.io/rankings

I wanted to see what would happen if I ranked the same matches with different ranking systems. Same results, very different number ones. It covers tennis and CS2.

This is in fact vibe-coded, but that doesn't affect the accuracy of the rating systems.

System	What it is
Elo	The classic chess rating. One number per player, which moves after every match. Can be inaccurate since it doesn't lower inactive players
Glicko-2	Elo with a confidence range, by Mark Glickman (paper).
OpenSkill	A Bayesian rating built for teams, used here one-on-one (library).
VRS	Valve's CS2 Regional Standings, adjusted to work for tennis. It runs Valve's own code unchanged. A little goofy, probably don't use this as an actual representation of skill.

All of them sit next to the official ATP rankings for tennis and Valve's own standings for CS2, where a team is a roster under Valve's three-of-five rule. Glicko-2 and OpenSkill also have a toggle for players who aren't playing: the textbook versions barely move someone who's out injured, so by default they slowly sink instead.

On the site:

• Rankings: each system's top players, with a strip showing where every system puts them.
• Predict: pick two players and see who each system thinks wins, plus their head-to-head.
• Tournaments: the season calendar, plus stats for every event under every system.
• Records: weeks at #1, biggest upsets, biggest rises and more, for any time period.
• Player and tournament pages: rank history charts, titles and results.

It updates itself every morning. Data: match results from TennisMyLife, built on Jeff Sackmann's tennis data; prize money from Wikipedia; trophy photos from Wikimedia Commons; CS2 results from Liquipedia (CC BY-SA 3.0). Technical details are in HOW_IT_WORKS.md.

More soon

Other projects will show up here.

What's in this repo

Path	What it is
site/index.html	The homepage
site/rankings/	The rankings site's pages
scripts/	The data pipeline that fetches results and builds the rankings
.github/workflows/update.yml	Rebuilds and deploys the whole site every 3 hours with GitHub Actions

FAQ:

Q: Why is there a Mocha theme?

A: Cause Catppuccin Mocha is my favorite theme.

License

Code: MIT. Rankings and stats shown on the site: CC BY-NC-SA 4.0, like the match data they're built from.

Not affiliated with the ATP, TennisMyLife or Valve. Built with help from Claude.