In chess, a pin is a situation brought on by an attacking piece in which a defending piece cannot move without exposing a more valuable defending piece on its other side to capture by the attacking piece.

Many openings require intimate knowledge of deep, strategic ideas and move-order subtleties. First of all, it is key to always remember these 5 opening principles: -Control the center. (Specifically the e4, d4, e5, d5 squares) -Develop your pieces to actively create threats. -Try not to move a piece twice. -A knight on the rim is dim. (Developing towards the center greatly increases the mobility and scope of your pieces) -Get your king safe. (Leaving your king in the center can dangerously expose you to tactics)