[deep]

Natural Sistem 4° Major

Scoring: MP

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1♠ (pass) ?
what bid south?
Sistem is natural then i cannot use bergen and other bid not natural. I dont know as i am able bid. TY at all

[hrothgar]

I'm torn between

a limit raise
a single raise

I think that this is closer to a limit raise. I'd bid 3♠ (or whatever bid systemically shows this hand type)

[JLOL]

Definitely at least a limit raise imo. And a limit raise is enough even though if partner has a doubleton heart and a min and passes you might miss game.

[DRWTAHOE]

4 spades

[ArtK78]

Assuming that 4♠ has the usual meaning (long spades, weak hand), 4♠ is not an option with 2 aces. You could miss a slam. For example, partner could have:

KQJTx KQJTx Ax x

A limit raise looks right on these cards.

[skjaeran]

To me 4♠ denies 2KC and normally promises a singleton. I'd show this as a limit raise. Preferably with a Bergen raise showing an 8-loser hand if possible.

[Old York]

Using a 4 card major system, very few players would ever open a 4 card Spade suit, unless they hold a strong balanced hand. So the bid normally shows 5 cards.

My vote is a Limit Raise to 3 Spades showing 8 losers, this describes the hand well, and allows opener to decide the final contract, if opener rebids 3NT then correct to 4 Spades.
It is possible that 10 tricks are available, even if opener is minimum, but jumping to 4 Spades seems bad.

Tony