Alternative move shown as wrong

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The Power of the Capture Check 

Staunton--Hartrison,1840

Last move Rg2+ is just as good as Rg6+ leading to a mate in two as the author says himself but I got a decrease in my percentage. :(

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Also in the course The drawing zone part 1 : Lesson King Behind the Barricade the hints should be about the black king instead of the white king.