Half of the teams in the Bermuda Bowl found the grand in spades, half a small slam.
The easy opening is 1S.
Responder actually has a problem, IMO. On the one hand, the clear textbook call is 2H, for the obvious reason. However, 2C is really appealing. The suit is real, so there is no lie involved. If Opener happens to rebid 2H, tactics can change to a heart raise, if you want. However, after either a 2H or 2D rebid, the latter seeming likely, Responder can set trumps at 2S, which saves a lot of space for cuebidding. Personally, I really like 2C. Hold that thought for a moment...
Let's assume, however, a normal 2H response. Opener has problem #2. He wants to rebid his spades, especially with three small hearts and no honor. However, support with support seems to prevail. So, 3H it is.
Responder now has hearts set as trumps for cuebidding purposes. So, he cues 3S to show a spade honor. Opener, liking everything about his hand except the three small hearts, probably bids 3NT serious, although blasting 4NT makes sense, but this leads to an inferior small slam, it seems. After 3NT, Responder might sense troubles and take over himself, but how? 4NT still only answers the heart question. 4S, as RKCB but re-focusing spades for answers works, if Responder thinks this through. After a serious 3NT, slam will surely be bid. So, a 4S call, if a grand is there, will yield a response showing three Aces and the spade King. That's 11 easy tricks (five spades, four clubs, two aces), with assuredly a 12th coming from hearts or a diamond ruff. A grand try should result in acceptance if Opener has the heart King (with which he will be surprised to hear the 4S call) or a sixth spade. If Opener bids 7H, a correction to 7S works.
Thus, Responder ultimately needs to ignore the heart suit even after agreeing hearts.
Wow, is that difficult, though.
Back up to the 2C option. I tend to leap at 2C as my option whenever it is plausible, This hand shows another example of why.
I want to hear a 2D or 2H call and then to set trumps at the two-level. Instead, I hear 2S. Now, at least I know about the sixth spade already. As Responder, I set trumps by raising to 3S. Whatever happens, if I make sure that I ask questions, I will be able to count 12 easy tricks (the same four clubs, two Aces, and now six spades) and need only a doubleton diamond for the 13th, or the heart King, or the diamond King, or a finesse/squeeze decision.
So, strange as it seems, I again like the idea of temporarily ignoring five cards in the other major when you have three-card support for the opened major, when 2C as the GF is plausible. It almost always produces a better result in the long run.
Tough hand. The key to an easy auction is to ignore the hearts early on rather than to ignore the hearts later. People sometimes think I am insane for ignoring side five-card majors in these circumstances, but just think about and watch the results of doing this when you have problem auctions with this situation -- three-card support, five of the other major, and GF values. The auction is OFTEN screwy when you respond in the five-card side major, whereas the alternative auction is USUALLY easy and more successful.