Posted 2022-March-23, 15:30
A lot of players (even in weak NT countries) think that "double = equal values+" is a good agreement. They argue that you need to compete when you could have the hand. Mike has written above in great detail what I would say about why that's wrong (in particular, "you have a balanced 9. They've found their fit. What do you do?" and "you have a balanced 4-5. Whose hand is it?")
If you have this agreement, you're in on a lot more hands than those who play the way Mike and I recommend. But decisions on game, say when you're vulnerable and they're not, are a "can't get it right beyond a straight guess", whereas going plus on a partscore board will almost always get you a decent score, even if it's +50 into +110 (because there will be a bunch of -50s/-100s that got pushed too high, and +50s from when they got pushed too high).
The question is very interesting, because the colours and the strength of the hand argue for defending even if they have a fit, trying for 500. That's really dangerous at other colours, and it's a question worth investigating. The reveal that West/their agreement has hooped the partnership because it's a bad one - oh well. That doesn't take away from the question, and "what agreements should one have when they run from 1NTx in order to maximize our advantages".
When I go to sea, don't fear for me, Fear For The Storm -- Birdie and the Swansong (tSCoSI)