TCU starter Preston Morrison (11-3) got the first out in the 10th before walking Choruby and allowing a single to No. 9 hitter Michael Barash. Allemand's flyball to left off closer Riley Ferrell sent home Choruby.
Texas A&M (50-13) will be trying to reach its first College World Series since 2011 on Monday. TCU (48-13) went to Omaha last season.
Ryan Hendrix (6-3) went 2 1-3 innings in relief after Texas A&M starter Matt Kent threw 7 2-3 scoreless innings.
Logan Taylor had an RBI double in the sixth for Texas A&M. TCU, the visiting team in its home park, tied it in the ninth on Keaton Jones' sac fly.