One's ability to see chess tactics concerning the Knight.
With the White Queen on D3 and a White Knight on G5 on the open diagonal, Black to move, he plays ...g7 to stop Mate. Seeing the threat, Black was wearing his Knight Vision Goggles to see it with.

I noticed Magnus was wearing his Knight Vision Goggles when he sacrificed his Bishop followed by Nxf3+, Forking the King and Rook.
by DecemberTwentynine March 12, 2015
Get the Knight Vision Goggles mug.