Yesterday evening, I set up this USDAA Masters/PIII Gamblers course designed by Peggy Hammond.
Since the principles of distance handling are the same no matter what the venue, I decided to film the gamble portion of the course. When I analyzed this course last night, I thought the only way to be successful was to begin the gamble with the dog on my left. Then I would move up field and signal the turn into the correct end of the tunnel. Next, I had to scurry back down field to the landing side of the jump, making sure to back away from the line so I had room to move back in and place pressure on the dog's line from c to d. This worked every time with Belle, and it worked two out of three times with Dusty.
Then I decided to show what happened if you began this gamble with the dog on your right. I really didn't expect it to work. However, much to my surprise neither Belle nor Dusty had any trouble understanding what I wanted. As they committed to a, I did a rear cross to pull them away from the incorrect tunnel entrance, and then I signaled a turn away from me to the correct entrance. Because I was behind the dog at this point instead of even with him, I was able to get back into position for the push to d with less effort. Although I got to the line too soon with Dusty when I did the push, it wasn't nearly as soon as I got there on my second effort with him.