Blunders, and good moves I didn't play

Everyone has made horrible blunders at one time or another, and seeing as it's April 1st (Google's date mark to the contrary) I thought I could include some of my own. They are taken from 'sighted' games played at various points in the last two years. Wince and/or enjoy.

Black to play and lose, with ...Ngf6?? (Nd6#)

Black to play and lose with ...h6?? (Nxf7! ...Kxf7 Qxe6+ with mate to follow)

Black to play and lose with ...f5?? (Qg6, with mate to follow)

White to play and blunder with Rc8+? (...Nxc8 Rxc8+ Re8!)

Black to play and blunder with ...Bxg2+?? (If instead ...Kf8!! Black wins)

White to play and blunder with ...resigns!?

White to play and blunder with Kxf3?? (and now black has a perpetual)

White to play and blunder with Kd5?? (missing axb8=Q+)

It's horrible blunders like this that can teach the most however. For example the move Rc8+? in position 4 did win me the game as my opponent did not see Re8, and thanks to post-game analysis I became aware of the 'indirect protection' tactic rooks can offer each other.

Of these mistakes I am most annoyed with Kd5 in the final position, but Kf8!! in position 5 is the move I most wish I had played among all these - a very pretty way to win.