Playing a warm-up round at The Golf Club at Chaparral Pines for the Club Championship this last weekend by myself. Came up on a single playing ahead of me, and when he walked off #4 green to the cart area, I hit my tee shot to the green. I thought "That could be a good shot, hope it does not go in", since playing alone as a single. Out of the left trees, here comes the single that was ahead of me raising his arms and saying "Great shot!" I said "Did it go in?" and he said "YES!" When he had walked off towards the cart area (unbeknownst to me since I could not see him) he had stopped upon hearing my tee shot contact and watched the green and saw it go it!! Lucky day to play alone and still get a hole-in-one validated by another guy!