Family ducks
I had identified two slow moving pieces as the natural targets in a chess game. Both the pawns and the King are the sitting ducks which lend themselves to be hunted down. Each sitting duck has its own parameters which determine how vulnerable it is. Every duck has its own dedicated scenarios to attack them. Study of the the center and development lately, showed that the duck family has more kin. To name a few: King Squares around the King (focal points or PoP's) Weak pawn Strong square Invasion square Promotion square Center square (d5, e5) These sitting ducks have a few derivatives too. Pieces that slow down due to their function or due to tactical motifs: Defenders of said sitting ducks Pinned pieces In the beginning of the game, when the king safety isn't compromised, pawns are not weak yet and promotion is out of the question, you have to focus on the other sitting ducks. The center squares are there from the beginning, so they are the logical sitting ducks to base your d