Posted 2020-October-30, 01:04
In one partnership, I play that 1S 3D is an invitational hand in hearts (obviously, since opener isn't supposed to pass, one could also have a huge hand in hearts, but our agreement is 6+ length, invitational) with 3H as a 4 card limit raise in spades.
In my other serious partnership, we play 1S 3H or 1H 3S as a splinter in an undisclosed suit. This can be very useful since opener simply bids game unless he has a hand that has slam potential opposite the 'right' shortness. The next step asks (1S 3H 3S and 1H 3S 3N). Responses are up the line: 1st step = clubs, 2nd = diamonds and 3rd = other major.
Splinters are limited to about a bad 13 count at most, and generally 11-12.
4C and 4D are void splinters. There is a huge difference in how hands mesh for slam purposes when responder has a void as opposed to a stiff.
'one of the great markers of the advance of human kindness is the howls you will hear from the Men of God' Johann Hari
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I like to play 2N as a balanced raise, and 3♣/3♦/3♥ as mini-splinters. All showing a 4-card raise to at least 3♠. Then 3N by either partner is a serious slam try. In theory, this agreement may not be optimal but it's simple, consistent, and has high frequency. Also, in practice, it's fun and works well