# [APL (Dyalog Unicode)], <s>33</s> 32 [bytes](https://codegolf.meta.stackexchange.com/a/9429/43319 "When can APL characters be counted as 1 byte each?")<sup>[SBCS](https://github.com/abrudz/SBCS ".dyalog files using a single byte character set")</sup>

<!-- language-all: lang-apl -->

    {h⍵+1 0}+h←(⊢≡31 30|⊢)×21 2∨.≥-\

[Try it online!][TIO-jtxqdd7f]

[APL (Dyalog Unicode)]: https://www.dyalog.com/
[TIO-jtxqdd7f]: https://tio.run/##fY@/SkMxGMX3PsXZqtRK/nTwurrYSbAdXaI3NYFwW0wUijoJxRZadBBnBcGtky9Q3yQvcv1yU5zE5ZyTL8n58amJ65ZT5caXdVy92HGcPbH61sTlV4eD3XcMDXbi4j3O3ySHZHeUd79fBYeIj5/7cf7RPatH9CguV1TQP4mLh81axtkznQanR6TD4/6gbg@N9hpB@4AL5bWHutK4Uc6We1BViWA0vA4wykNXpS4P260RiMOycZFcUiSXDOJg60Xr3@7z6/DbbT18sM7BVpg4NW0QDBnBGuNiS@KZJETyvwm2ahhNCy8AbNb5D28yL9IcOecq5HKZpqLIC4CEUk9S6qVbztK6JD8 "APL (Dyalog Unicode) – Try It Online"

in: a pair in descending order

out: 2=ongoing, 1=ended, 0=invalid

tests stolen from [Adám's answer](https://codegolf.stackexchange.com/questions/182245/valid-badminton-score/182370#182370)