Have you ever heard of following expression while learning infinitives:
"James bond is to approach the selected target in Viena."
"The school board is to discuss this issue during next session."
...
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Now you can see the structure;
sb is to do sth
sth is to happen
etc
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which is meant to express sth formal and sometimes imperitive.
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You sentence can well be converted to:
The result is to make entrance harder to amatures.
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And because it describes sth happened and sth still having current effect, the Present Perfect Tense is used.
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period