PDGA Bacon
Enter two PDGA players and see every sanctioned event they've both played, who finished ahead, and their Bacon Number if they never have.
For each shared event it says how close the two players actually got: same division, same layout, or the same card. PDGA only records cards for some events, so where it doesn’t, a model guesses from how close the pair finished in the standings and labels the guess High, Medium, or Low. Head-to-head uses division place first, then strokes on the same layout, then round rating, and each result says which one it used.
The data comes from one Durable Object crawling a priority queue: a player someone just looked up goes first, the backfill back to 1979 goes last. It makes one request to pdga.com every ten seconds, per robots.txt. Raw pages are kept gzipped in R2, so a parser fix can be re-run without crawling again.