Private league tool

Keeper rules, computed

Keeper management and league history for a twelve-team Yahoo fantasy football league, now in its tenth season.

Our league keeps players year to year under rules Yahoo cannot express, so the bookkeeping has always lived in a spreadsheet maintained by hand. This replaces it: keeper eligibility and cost are derived from what actually happened in the league — every draft, every trade, every waiver claim.

Keeper rules

Two keepers per team.
A player is held for the season they were acquired, plus two more.
Drafted or traded for — costs their original draft round. A trade moves the tenure intact: the round and the original draft year both follow the player.
Picked up from free agency or waivers — costs the round their average draft position fell in that season, locked from then on. The pickup season starts their clock.
A first-round cost can never be kept, however the player was acquired.
Two keepers landing on the same round: one stays, the other moves up to the nearest earlier round still free.

What it does

League history is read from the Yahoo Fantasy Sports API and cached locally. From draft results and the full transaction log it reconstructs every player's tenure — who acquired them, how, when, and at what cost — then applies the rules above to show each manager their legal keeper options and what each one would cost them on draft day.

Planned

Yahoo shows a season well and ten seasons poorly. The rest of the work is the record our league has never been able to see:

All-time head-to-head records between managers.
Lineup efficiency — what you scored against the best lineup your roster allowed that week.
All-play records, separating the teams that were good from the teams that were lucky.
A record book, and drafts, trades, and waiver claims judged in hindsight.

Try it

The keeper board is running against a synthetic league — generated history put through the real rules engine — while API access is pending.

Status

In development. The keeper rules engine is built and tested. Access to the Yahoo Fantasy Sports API is pending approval, which everything else waits on.