A team has finished a game with 12-8-3 runs-hits-errors line 1 time since 1897, most recently Boston Red Sox on 8 June 1901. That is about one every 443,004 team-games.
Box score for the most recent one ↗
12-4-0 12-6-6 12-7-2 12-7-0 12-7-1 12-8-8 12-8-3 12-8-0 12-8-1 12-8-2 12-9-3 12-9-2 12-9-0
The whole distribution — Runs-Hits-Errors Lines · All 18 shapes