My estimate was off by 1. I checked and it will be the 22nd time SP has been in the Semi-Finals. They have played in 13 title games, 1969, 1974, 1985, 1986, 1994, 1999, 2007, 2009, 2010, 2011, 2013, 2020, and 2021. They have lost in the semis 8 times.
Semi final losses:
1977 SP 0 Alcoa 17 (Alcoa beat Lake Co 33 -7 for Class A title)
1993 SP 14 Trousdale County 16 (TC beat USJ 14 - 0 for Class 1A title)
1995 SP 15 BGA 17 (BGA beat Bruceton 17 - 6 for Class 1A title)
1998 SP 32 Trousdale 42 (TC beat USJ 63 -13 for Class 1A title)
2001 SP 6 Cloudland 44 (Cloudland lost title game)
2016 SP 27 Greenback 42 (Greenback lost to Dresden in title game)
2017 SP 21 Greenback 31 ( Greenback beat the Corndogs for the title)
2019 SP 26 Greenback 27 (Greenback lost to Lake County in title game)