Well how many ways can I explain this. The tech part of it is that the first 26 feet has over 60 units of oil (A FLOOD!) Then it continues down to 40 feet with slightly less. The same amount of oil is distributed basically even from gutter to gutter.
Now to describe it in a different way. For lefties or right handed, it does not matter. There is NO playable shot outside from the 10th board to the gutter. Corey Kistner, a fellow bowler said it best, "The 10 board IS the gutter!" That describes this pattern to a T. If it gets outside the 10 board it is not just out the window, it is off the planet. Nothing, and I mean NOTHING! will hook back to the pocket if it gets outside of the 10 board. So if all you know is how to play down and in from the outside on your home house shot.You are SUNK! Cause that won't play here.
The US Open oil pattern is considered to be BY FAR the toughest shot on the planet. Anyone who has ever bowled on it will NOT disagree.