Does the Longest Chain Always Win the Mining Award?

Does the Longest Chain Always Win the Mining Award?

If the longest chain (i.e, the one that's the most difficult to produce or the most transactions) is always awarded with 12.5 coins (or whatever the current prize is), what happens if a specific node is aware of a certain set of transactions but doesn't broadcast them to other nodes (the network) and includes them in it's own hash.

Wouldn't this automatically guarantee it will win the mining award?

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