Unusual Two Spades
Specific to the auctions: 1♥ – 1NT - 2♣ and 1♥ – 1NT - 2♦. In these auctions responder is known to have fewer than 4 spades. Thus, a call of 2♠ would have no sensible meaning. In these situations the raise of partner's minor is a slightly weaker hand, and the 2♠ bid is a 'power' raise to opener's minor, usually based on 5+ of partners minor and invitational values.
Read more about this topic: Forcing Notrump
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