A team has finished a game with 6-15-6 runs-hits-errors line 7 times since 1897, most recently Cleveland Guardians on 3 August 1939. That is about one every 63,286 team-games.
Box score for the most recent one ↗
6-14-7 6-14-4 6-14-9 6-15-3 6-15-1 6-15-2 6-15-6 6-15-4 6-15-0 6-15-5 6-15-7 6-16-3 6-16-1
The whole distribution — Runs-Hits-Errors Lines · All 18 shapes