{comments}
Basic GIB btw, but still.
Look at the 4♦ bid. It says 13+ points, which is more than it has. Yes it has a doubleton diamond with no wasted point in it and possibly thinks my hand is weaker than it is, but I wouldn't consider that to be worth all that much. So why not just bid 3♠? It only has a Qxxxx of spades, which is okay to introduce at level 3, but not at level 5. And then it gets stuck introducing it at level 5. Maybe I'm just missing something here, but can someone explain how 4♦ is the best bid here? Or just agree that it's a bad bid and it shouldn't bid it with that hand. And they only got 9 tricks so being at 5♠ was not a very good place to end up.