Unsolvable Lesson on Chess.com?

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Avatar of CompleteChaos
I was doing a lesson on chess.com and the third move seems unsolvable. I tried every possible move but it won’t except any of them. Was anyone able to do the third move?
It was in Silman’s Lessons in Strategy (1) : Position from Nimzo-Indian, Huebner Variation.
Thanks,
Help appreciated.
Avatar of IMKeto

3...ef4

Avatar of CompleteChaos
Oh wow!
I can’t believe I missed that!
A little embarrassed, actually.
I thought I tried everything.
Thanks man,
Complete Chaos
Avatar of IMKeto
CompleteChaos wrote:
Oh wow!
I can’t believe I missed that!
A little embarrassed, actually.
I thought I tried everything.
Thanks man,
Complete Chaos

Glad to help