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一分鐘完成驗證Table tennis Elo ladder for Ashdown House, MIT. No accounts, public match log, one rating.
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取自儲存庫 README
正在載入完整 README。 以下為已儲存的摘錄。
The table tennis ladder for Ashdown House at MIT. One table, one leaderboard,
one rating per player. Record a match, watch the numbers move.
Live at ashdown.win.
There are no accounts. You create a player once, under your name, and from
then on anyone can record a match between any two players. The winner gains
rating points, the loser gives them up, and the leaderboard updates
immediately. Every match ever recorded is public, so every rating can be
traced back to the games that produced it.檢視完整 README ↗The table tennis ladder for Ashdown House at MIT. One table, one leaderboard, one rating per player. Record a match, watch the numbers move.
Live at ashdown.win.
There are no accounts. You create a player once, under your name, and from then on anyone can record a match between any two players. The winner gains rating points, the loser gives them up, and the leaderboard updates immediately. Every match ever recorded is public, so every rating can be traced back to the games that produced it.
Doubles count too. A doubles team plays as the average of its two ratings, and both partners move by the same amount, at half the weight of a singles match.
Filed a match wrong? Delete it. The deletion shows up in the log like anything else. Cheating is possible and would be visible, which in a house of a few hundred people is enough.
Standard Elo, the same formula chess uses. Expected score against an opponent is
E = 1 / (1 + 10^((R_opponent - R_you) / 400))
and after the match your rating becomes
R' = R + K * (S - E)
where S is 1 for a win and 0 for a loss. K is 32 for singles and 16 for doubles. Everyone starts at 1000. The full derivation, including how doubles is handled, is on the algorithm page of the site and in docs/algorithm.md.
Ratings are never stored. They are recomputed from the match log every time, so a change to the constants or the formula applies to all of history at once.
The code is open so that anyone in the house can check the maths or add a feature. Open an issue or a pull request. Design rationale and the record of every decision so far live under docs/.
MIT.