A single (trading logic) parameter system must have the same entry and exit (reverse) trading logic (including input parameter) to meet my personal qualifications. That said I don't necessarily believe that best way to go is always use a single parameter. I happen to like some approaches with 2-3.
Taking inspiration from your pseudo-code, I would consider this to be a single parameter system (reverse logic for short/exit):
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If (todays close < todays open) then buy on market open
I would say it becomes a philosophical issue of whether you consider a single trading logic parameter long only system to be a single trading logic system.
In other words is choosing to be long only a trading logic parameter in your system?
sluggo wrote:In your opinion, does the following pseudocode define a zero-parameter system which goes flat?
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If (todays close < todays open) then blackcandle = true ; else blackcandle = false If (blackcandle = true) then buy tomorrow at (todays high) on a Stop and exit at market on close