I met a man who wasn't there

One major way to spill your time during solving a problem is by chasing ghosts.

White to move

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[solution]

Only after chasing phantoms for six (!) minutes, the ghosts stopped haunting me. What remained was a simple win.

Yesterday, upon the stair,
I met a man who wasn't there!
He wasn't there again today,
Oh how I wish he'd go away!