Another easy puzzle.    A) 1.....Kxg7    B) 1....Re8  (NOTE: White's last move was 1.Rxg7)

Won't White win after 2.Nxg6+?

Good find. Indeed White wins also with 2.Nxg6+. For example 2...Kxg7 3.Qxe8 hxg6 4.Re7+ Kh6 5.Qh8+Kg5 6.Qh4+ Kf5 7.Be4# is checkmate.

What this thing shows is that a GM can also make a big mistake in analysis.