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What is a good grand slam?

Given the poll Richard Fleet published on Paul Weinstock problem, I have a question.

What should be the odds of the grand to make it good in IMP teams opposite competent/expert opponents.

Assume that 6 always makes, and that your opponents are as likely to reach 6 or 7 it as you are.

>95%
>90%
>85%
>80%
>75%
>70%
<70%

Sorry, to answer polls. Registered users can vote in polls, and can also browse other users' public votes! and participate in the discussion.

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