T3 is Trailblazers and is used in 2nd round Trailblazers.
There are 2 rounds, jump round 1 and if clear you jump round 2 over a slightly bigger course and if still clear you jump round 3 which is against the clock. The top 4 horse/rider qualify for the finals.
I think round 1 and 2 were round the same course, just bigger in round 2.
Yeh, it's 3 rounds BUT been looking at schedule for 2nd round TB at somewhere (can't remember where) and says it is table A7 which in my BSJA rules book says is over 2 rounds