You will have cheating no matter what with the 15 minutes delay and if you have access to the market live.
For the friday deal, it should be easy to incorporate time factor to prevent people from buying during off hours, but I am not sure on how this would help.
So what he did, at market open he simply bought at 9:40 with friday prices since the current price did not kick in yet (starts for us at 9:45). There are reports which show big movers. He probably read them and picked one.
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