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Old 04-10-2019, 02:10 PM
merrick is offline
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Join Date: Jan 2010
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Posts: 334
1S - 3H is a game-forcing raise in every natural system I've heard of, and it works fine here: 1S - 3H, 4H - 4NT, 5H - 6S (if you're playing RKCB, that 5H will be 5S, but it matters not).

Jacoby 2NT, if you're playing it, is better (and it works over an opening 1H, while 1H - 2S gets risky if partner raises Spades), but a lot of Acol players play 1H/S - 2NT as an invitational raise rather than an unconditional force.

Or there's a straight Blackwood 4NT, as septimus suggested.
Whatever the system, 4S is a serious underbid - you have a 4-loser hand and a massive fit.