Four-hour commentary by Peter Svidler and Yasser Seirawan -- I'm surprised this has only 3,000 views. What a privilege to sit in on a commentary between two former World Top 15 players. It helps that Svidler has the diction of an Oxford professor. Full of extemporaneous insight and intuitive assessments.
Black to Play
Black is a talented 10-year-old kid rated about 1600 USCF. White is a lifetime 1800 with about 3,000 rated games under his belt. The kid has thoroughly outplayed the wily old veteran, but played the hideous ...f7-f6 from the diagram position at left. Like most endgame mistakes, this is a completely unnecessary pawn move. It opens the 7th rank and untethers the knight which can now be harassed. Correct was simply to activate the pieces-- i.e., Kf8-e7-f6 and then have a look around. Instead, this really, really, actually happened in a rated club game: