The repetition of his major by the opener after a 2/1 response
The repetition of his major by the opener may be the only option to keep the bidding at a low level. Let's not forget that the 2/1 response is auto-forcing.
- The repetition of his suit by the opener is simply a waiting bid that shows a 1st zone hand (12-14HCP)
- The jump repetition of his suit by the opener shows a solid 6 carder in a 2nd zone hand.(15-17HCP)
The opener has no choice but to repeat his ♥, even though he only has 5 cards. (2SA would show 15-17HCP...which the opener does not have...)