The undefended piece is a perfect target for any of the previous tactics we've seen. The overworked piece is easy to spot, too. See the diagram for the difference.

In the diagram you can the black rook is undefended. If it was white's turn he would play Rh7+ and after the king moves the rook could be captured for free. If it were black's turn he would play the powerful Nf4+ drawing the overworked white knight away from the protection of the c1 promotion square. Looking for overworked or undefended pieces can make your move selection simple if you know what to look for.

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