I have my first dressage show with a new horse and under the new tests on Sunday but a question has come up that I am not sure about.
During the Intro B there is a change of rein across the diagonal (K-X-M) at the working trot. The test is written up in that it calls for a "clear definintion in the trot" but I am not sure if they want to see just the same working trot that is done throughout the test, which would mean no change in length across the diagonal, or some small manner of lengthening. I know when I rode the tests back in the late 80s (intercollegiate) the judge wanted to see some definitive lengthening in that type of diagonal.
My boy has no problems with this particular part of the test; he likes those long changes as he also likes to lengthen; just expects it as this a part of training repetition. One exercise I use is to lengthen down the long sides (or diagonals as the case may be) and collect at the ends.