The Critical Bid is 3H saying "I have three Hearts but not four, I may havefive Spades. Where are we going? Whether you open 1D or 1H, partner can jumpto 3 in the suit to show values for game and 5 spades, offering East optionsfor the best game. In case W has slam interest E can show a minimum by bidding3S and jump to game with max HCP
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