The true reverse block is a myth that the majority of bowlers cannot differentiate from a flat pattern. Just to speak on it in the most generic way possible, say you have a flat pattern, 18ml 1:1 ratio 40 feet. You throw a shot 15-6, it only recovers 5 boards from the 6 board(comes into the pins at board 11) and you leave a washout. The bowler thinks:
"Out of bounds there from 10 out, I can't get the ball back from there"
On the next shot, the bowler throws a shot 15-13(hits the same mark in the heads, but doesn't get it out as wide). The ball still hooks 5 boards from 13 and goes through the face for a big split. The bowler thinks:
"Wow, I hit the same mark, the ball hooked through the face. It must be dry in the middle of the lane because when I sent it out, the ball didn't recover."
What you see there is not a reverse block, it's just a flat pattern that is going to make your ball respond in a matter to where you throw it. A TRUE reverse block is a flatter pattern or a low ratio pattern that gets played by the bowlers in the middle of the lane to the point that the bowlers dry up the track and middle of the lane first, leaving a fresher amount of oil on the outsides. No lane graph/pattern will lay out a pattern where there is a lower concentration of oil in the middle than there is on the outside. That's why you'll never hear of or see a 1:3 or 2:5 ratio pattern from the start. It's the gradual breakdown of oil in the middle by the bowlers that will cause the reverse block effect.
Now the best way you want to attack a reverse block is on the inside line where the oil is fresher and use a core/drill combination that is going to minimize flare through the front of the lanes, and a ball surface that is going to glide through drying heads and midlanes. Your lanuch angles should be tighter as well. Then you want to play around 23-27 inside out to the middle of the lane at the breakpoint(anywhere from 15-11) as if it were the bounce that you're trying to hit on a THS. Use the drying oil in the middle as your "bounce" back to the pocket, just make your angles tighter. I've seen some high level collegiate players and amatuers kill patterns like these as they break down in long format tournaments using these same strategies. Once you get dialed in, it can become as easy as a house pattern, you just have to learn how to "cut off" boards 1-12 on the right side of the lane as if they don't even exsist.
A really good example was the 2006 Tournament of Champions on the 50ft shot. If you got the ball out anywhere right or left of the 12-13 board then you were plucking 3 off the left. The pros automatically read that and being the shot makers they are, they were all able to fire shots from deep inside to the "wall" at 14-15 at the end of the pattern and fire off 240+ averages. Once you become confident in migrating left and keeping your angles tight then the "reverse block" will be one of your strongest patterns to play.
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-DJ Marshall
...The Twelve In a Row Pro Shop
