Muppet Stayman

3 asks partner to descibe their hand

• 3 shows at least one 4 card major. If Responder was looking for a 4 - 4 fit they now bid the major they do not have or bid 4 to tell partner to pick the major. Responder could also have bid 3 to give Opener the chance to show a 5 card major
• 3 denies a 4 or 5 card major
• 3 shows 5 spades.
• 3NT shows 5 hearts. Responder bids 4 to transfer to hearts if that is where they want to play.

Why does this version of Puppet Stayman reverse the meaning of the 3 and 3NT bids:

When Opener bids 3 to deny a 4 or 5 card major it gives Responder the room to show 5 spades. Responder would bid like this with 5 spades and 4 hearts or 5 spades and 3 hearts.