That's a random teams practice hand on BBO. Sitting at East we couldn't find the best contract in given layout. Tho we gained 15 IMPs i don't count it as a success. Instead it's dead wrong. For this reason I would like to read others tech reviews.
Our bidding was :
P 1♦ 2♣
Double 2♥ Double 2♠
2NT P 3nt 4♣
4♦ P 5♦ AP
My thoughts : Playing 2/1 Invite and a few popular gadgets seems partner's Double is a mistake. I would prefer 3♣ or 3NT. If he would bid 3♣ i would read as fit for ♦ suit and a good hand there. I guess with 13 HCP he should not give an invite bid but declare a game contract. That's why i think his 2NT isn't correct. You know, it's easy to think there were 10-12 with double then 2NT. So 17+10/12 = 27/29 just 3NT seemed fine right that moment.
And..I think i also wasn't good enough there. Such as 4♥ could work better instead of 5♦ over 4♦. I held 17HCP and 6/4. I have no idea why i underbid a lot. There weren't any firm reason. Meanwhile, people play double to 2♥ penalty? Still unsure.
May I have your complete bidding for all players?

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