Guys - I have been timed out of a few crowdsales due to people getting their ETH to arrive into smart contract way quicker.

I have used Metamask and upped the GAS etc as high as I can feasibly afford.

My question is this ...

If an ICO advertises that it opens at block X. What would be the strategy to jumping the gun on that? If I sent when the block showing on a live chain scanner reads x-1 or even x-2, would that have potential? Or would that just not work.

If anyone has any links on this topic Id be massively grateful.