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Liquid validity
I trade only eur usd , but I have sometimes traded cable and dax , the latter do have slippage , but eur usd rarely has liquidity/slippage issues.
This is why most pros trade eur/usd.
Does that mean you are saying all your limits fill first time...
No matter how liquid a market is, price can and will move in between
order placement, broker server receiving it and then executing.
Nobody has limits that always fill first time.