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If you're playing 5-card majors and have 18 HCP, what should you open with four spades and four hearts?

After East overcalls 2♣, we would give to be able to place a penalty double. But we can't because partner would think it is a negative double. Or can we?

West opens the bidding and partner places a takeout double, telling us to choose a different suit. But West's suit is also our best suit - we don't want