Splinter Response to 1NT

Whatsapp

When your partner opens 1NT and you hold a game forcing hand like ♠A93 ♥4 ♦KQ842 ♣A762, it can be difficult to determine whether to play in 3NT, 4♠, 5♣, 5♦, or look for slam.  Responder needs a way to show their game forcing values, and their shape, particularly their heart shortness to consult their partner on the choice of games.  

Playing Jacoby Transfers, you don't need a jump to 3♥ or 3♠ to show length in a major (or both majors), it is best to use these jump responses as Splinter Bids. 

The 3♥ jump response is alertable, showing a game forcing hand with 3 spades, 1 heart, and 5-4 or 4-5 in the minors.

The 3♠ jump response is alertable, showing a game forcing hand with 1 spade, 3 hearts, and 5-4 or 4-5 in the minors.

Opener rebids naturally.  

On the above auction, responder's jump to 3♥ shows a game forcing hand with 3-1-(5-4) distribution.  The table below summarizes opener's rebids.

Opener shouldn't jump to game.  Responder is unlimited.  Opener should leave room for responder to look for a slam.

Opener's responses to responder's jump to 3♠ are similar.

On the above auction, responder's jump to 3♠ shows a game forcing hand with 1-3-(5-4) distribution.  The table below summarizes opener's rebids.