I have been look at into the development of a system that is totally indicator/ bar pattern free and fully probability driven, not an easy task, but once created you could in theory place it on to any pair any time frame any broker and achieve better than average results and it would not matter whether the broker alters the price or not so I started with a few “simple questions” what a joke.
The more you think about it the bigger the questions become, anyway here are the starting questions

Questions

(All based on the position entered on a new bar open)

How do you identify in which direction a bar is likely to move without using indicators?

What is the probability of the TP or SL being hit?

What is the maximum TP will be hit?

What is the maximum SL will be hit?

What can we control?

What is out of our control e.g. volume, price, Etc?

Some of the other things we need to keep in mind.

Should you treat your broker like your friend, or an actual broker or the house as in the casino house because as you all know the house always wins?

What the brokers edge (the house edge)?

The world is run by statistics if you don’t believe me just pick up a North, East, West, South Paper (News paper) and tell me there are no statistics in it.

Why not build a system that caters to that sort of thinking.
Some further reading

Wizard of Odds: The last word on gambling strategy
Casino game - Wikipedia, the free encyclopedia