My clear preference is to open 4S. Although 2nd seat preempts have the least advantage I think this hand has the offensive potential to make this a winner. It will put the most pressure on opponents.

Second choice would be 1S arguing that I have the master suit and will be able to outbid opponents easily.

3S opening is pusillanimous and all too likely to lead to a missed game (picture ak or kq of diamonds opposite) without putting much pressure on opponents.

Looks like a 4-Spade opening to me - I would count 7 spade tricks and 1 diamond, so expecting only 2 down if partner can't contribute anything.

If you have a 4D opening showing a solid spade suit - even better.

Opening 1S would only be right if your preempts are normally so wild that partner won't think you are this strong. But with very little defence against a heart- or club contract, I wouldn't be happy to let the opponents in cheaply.

I would open a simple 1S. This is determined more by form of scoring and tactical considerations. At Imps or in 1st or 3rd position, I would open the hand 4S.

In pairs there is a premium on bidding to the correct level or on the value of undertricks should the contract fail. As Spades is the boss suit, I can somewhat control the bidding and would bid 1S and repeat to 2S and 3S and even 4S if the auction suggested that it may be correct. In 2nd position, there is less value in preempting as one of the opponents have already passed.

On these sort of hands where we have little defence and great offence we want to start the uactiob as high as possible to potentially make life more difficult for the opponents to have a constructive dialogue if the hand belongs to them. So for that reason opening 1S is not recommended. The hand is also too good for a simple pre-empt (the fact that we have an eau-de-cologne hand = 4711 in shape also adds value to our offensive potential). So with no other agreements I would open 4S.

However most p[eople these days play some form of Texas or Namyats where opening 4C shows a good hand with hearts and opening 4D shows a good hand with spades. My rule for a Namyats opening is that it is either a solid suit with no outside ace (and no other significant values), or a one loser suit with an outside ace. Normally it is an 8 card suit but 7 is ok with a side 4 card suit as here. The advantage of a Namyats opening is that if partner has slam interest they can use the step response (4D over 4C or 4H over 4S to express slam interest which allows you to bid your lowest shortage -singletons can be the way to getting to a perfect slam. So my first choice opening would be 4D (and if partner bids 4H as the step response we can bid 5C, and that still leaves room if partner then cues 5D to go 5H).