Hand 1:
Is pass here forcing ? We defended 5♣-2 to pick up 100 when I decided it wasn't with
Hand 2:
This was the typical hand where both pairs have a bad result in the set on different boards but good results on the same board I have no idea how this should be bid.
This was the bidding at our table and we quickly took 3 diamond tricks for +500, at the other table in a multi auction, W bid the spades and played 5♠x, the diamond lead wasn't found and this made all 13 for 18 IMPs to the good guys
Hand 3: Vul vs not in second seat, what do you expect from partner's 3♦ bid on this sequence ?
1N(12-14)-P(you)-2♣(stayman)-3♦
What do you do if anything opposite it with 9xxx, Qxx, A9, AKJx ?
Hand 4:
Team mates got 2 slam boards wrong, this was difficult I think. Their system is precision 15-17 1N, 1♦ 1+ ♦ less than 16 points
Your bid.

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