Billy,

I'd like to raise an issue about fills.

If market makers note pre-market sizable orders for, say, IWM @82.21, how will this affect their actions at the open?

I'm sure they have more than one response, depending on their positions relative to the market.

But if you could educate me on this, I would be once again in your debt. However, if you've spelled it out previously, my apologies.

Of course, this question is based on the practical problem of whether or not one should place pre-market limit orders for the market open at precisely the prices dictated by the robots. Or, should one play some "games" and conceal ones orders until the market makers and machines have shown their hands for the morning or day?

Many thanks,