1.
What do you think of partner's chosen sequence? We don't play Serious/NS 3NT, so he was probably worried about making a move over a possible 4S bid from me if he had bid 3S rather than 3C. Obviously it's a marginal slam but it does have the virtue of making. At the table I passed; +480 was the result at almost every table, and nobody bid the slam.
2.
It looks to me like 3S is the right answer double dummy, but double would have gotten all the marbles at the table, since declarer managed to hold himself to seven tricks. I think I should have predicted that. I passed; +100 was a poor matchpoint result.
3.
Do you think East has enough to double 5C to warn partner off? Obviously I didn't at the table, but I thought it was close. FWIW, neither of us believed this was a forcing pass situation. Partner elected to pass out 5C; +200 was, again, a poor result.