It’s a time-honoured question. There are guidelines to help you decide whether or not to bid game, slam or just a partscore. Just because you made 12 tricks doesn’t mean you should have bid slam.
If you bid 3NT with 27 points between you, and go down because the cards are unfriendly, doesn’t mean it wasn’t a good game to bid.
It’s important not to be a results merchant! That is someone who always knows best once the result is known.
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