I was West, the declarer. After this hand, we're surprised at the 9.3 IMP we've got, and even more at the fact that this is the only contract bid by the EW side.
http://online.bridgebase.com/myhands/hands...9661738-5761263
As you can see from the traveller, there is no other heart contract by EW on other tables. In fact this is the only contract (and also the only successful contract) bid by EW side. There are only a lot of ♣s by NS, and surprisingly large amount of NTs (made or set) by NS
Is there anything extraordinary about this hand so that 4♥ is so hard to reach? Is 5♣ possible by NS? Also post-mortem GIB says 4♥ can be set to -1. How is this possible?
Opinions welcome

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W N E S
- 1♣ 1♠ 2♦
2♥ 3♣ 3♥ 4♣
4♥ P P P
Opening lead: ♠4
Result: 4♥=
9.3 IMP to EW