Chess blindness, or the ability to miss an obvious threat or key feature of the position, is something that we have all probably experienced. For example, many games end in stalemate because of the opponent's failure to assess the position of the enemy king.
Diagram - Black has just queened a pawn which means that White's king cannot move without going into check. How does White take advantage of this ?
😎 View a middlegame position where both players miss an obvious queen capture
😎 Video - this is what chess blindness looks like (2:25)