Fastpitch Softball is basically a Women’s Competitive version of Baseball, and differs from the Coed / Mixed version of Softball played in Ireland since the 1980s, as the pitching is fast and not in a soft arc, as in the recreational version of the sport (hence the name softball). There are 9 players in a Fastpitch Softball team, like in Baseball as opposed to 10 in Co-Ed (Mixed) Recreational Softball.
The Fastpitch Ireland programme dates from the early 200os, when two Women’s teams were created, and then in the 2010s, the Softball Ireland National team (who played in both the World Championships and European Championships) was started.
In 2019-20 the first Softball Ireland Irish National Fastpitch League began, playing all its matches on the turf pitch at the National Indoor Arena in Blanchardstown, Dublin 15. Unlike the earlier Fastpitch Softball in Ireland, this is Coed / Mixed, with an equal representation of Men to Women (5:5).
Here are links to various Fastpitch competitions in Ireland and Internationally, involving Ireland teams:
Irish National Fastpitch League
Softball Ireland Irish National Fastpitch League Coed (Seasons): 2019-20
Irish Baseball & Softball Federation Ladies Fastpitch (Seasons): 2000
Picture Credit:  Softball Ireland (2019) Ireland Catches Fastpitch Fever: Teams A and B [Internet] Available from: http://fastpitchsoftball.ie/wp-content/uploads/2019/12/Team-A-B-300×225.jpg [Accessed 25 April 2020]