How to bid this?

[Cyberyeti]

The meaning of 3♥ is dependent on agreements. There are many alternatives for your example hand - a simple 2♦ inverted raise; a 3♣ response that shows an undisclosed splinter raise; various schemes in which the GF splinter raises are included in a 2♥, 2♠ or 2NT response along with other hand types; relay schemes based around a 1♥ or 1NT response; and probably some others too.

 

Since we are talking about Acol, the traditional meaning is a weak hand with long hearts. In recent times, both the splinter as well as the fit jump have overtaken this in popularity, at least at a high level. At club level outside of London, I would guess that natural and weak is still the default choice for most pairs.

 

Even in Norfolk where we're 15 years behind most of the UK, most pairs in our clubs play 1♦-3♥ as a splinter.

[dave_beer]

K-S plays the minor jump rebid as a rock crusher GF hand. The non-forcing invitational hands are put through fragment reverses and forcing 2♣ rebid. Only somewhat well known system I know of that arranges rebids this way.

Fantunes plays 3♦ as an Acol 2-bid but it isn't forcing since the opening bid was forcing and responder could have nothing

[zillahandp]

3h