Triangulation refers to a King maneuver which aims to lose a tempo, and leave the opponent with the move. (Dvoretsky) The d5 and d7 square are in correspondence. White in this position can easily “lose” a tempo and place his opponent in zugzwang.
1.Ke5! Kc6 2.Kd4 Kd7 3.Kd5 White has acheived...
Key squares are squares whose occupation by the King assures victory, regardless of whose turn it is to move. (Dvoretsky)
White to move is a draw.
It is important to note that a pawn on the 4th rank or below has 3 key squares, whereas a pawn on the 5th rank or higher has six key squares.
A Pawn on the 5th...
