The following are the three basic tactical play in chess
A fork occurs when two pieces are attacked simultaneously.A fork at its most effective when one of the piece being threatened is the king, as the threat to this piece absolutely must be dealt with. During the lesson the students will be covered how the knight can carry out the Fork.
A piece is said to be pinned when it is unable to move as to do so would expose a higher value piece to capture. Sometimes this means that the pinned piece will be vulnerable to capture.
A skewer occurs when a piece is threatened and this piece is unable to move away as to do so would expose another piece behind.