What Does He Mean Now?

Playing in a playdown for a team game this week, I gave my partner a tough bidding problem, yet again. Happy to say that he passed the little test with a perfect score.

No one vul at IMPS, he picked up K863 AKJ862 --- JT3 and over my 1S opener, he bid 2H, which we do not play as GF. I now bid 2N, showing a strong NT+ (and setting up a GF), and he bid 3S, which is a slam try in Spades. I bid 4D, and he correctly signed off in 4S with no Club control. Except that I now bid 5S, what does that mean and what to do?

After thinking about it a while, he bid 6H, trying for the Grand. I signed off in 6S, and even with a 4-1 Spade break, it easily made. His reasoning for going on, he had already denied a Club control, but I went on anyways, so I must not be looking for minor cards, but for how good his major suits were. Since he had great holdings in both majors, he went on to 6S.

My hand to produce this problem for partner was AJ95 Q7 KQT5 AK6. Spades were 4-1 on my right, so an opening Diamond lead might have given me some concerns, but the Club lead meant I could safety play the Spades. And yes, we do play 4 card Majors, so this is not an auction that the world would duplicate.

Next week is off to Louisville for the first part of the NABC and the NAOP pairs. Will post some of the interesting things that happen when I get back.