Hi chess enthusiasts, Chess is a game that requires both deep and broad calculation. A chess grand-master can quickly see twenty moves ahead (depth) and evaluate the overall position of a chess board (breadth) in a blink of an eye. One basic step in evaluating a board position is to calculate the number of threats on a piece. A piece that is threatened by several opponent pieces and not protected by an equal number of defending pieces is a potential target for attack. As an example, in the picture below the white benefits from capturing the h5 pawn.