What is a 2-Phase you ask?
A 2-phase consists of dressage and stadium portion of an event (no cross country).
The dressage portion is either walk trot or WTC . The rider rides a dressage test in a particular pattern.
The Stadium portion is jumping a course. Equitation is not involved but the rider is to jump a course and gets so many penalties if they knock down a rail or have a refusal (or fall off ) they would be eliminated if they go off course.
In stadium there will be small X rails, 2' 2'7" ,2'11" depending on what level the rider is riding in.