Fork and spear!
Do you the terms of fork and spear in chess? They are describing tactical weapons, which should be in our arsenal
1. The fork
One piece attacks two other pieces or points simultaneous.
Well kown is the knight fork, but all all other pieces also can do the fork job
2. the spear
One piece attacks two pieces in a row, line or diagonale. The first attacked piece is the more valuable one.
Only queen, rook and bishop can do the spear job
Here now a puzzle, where fork and spear helped to execute a decisive blow
( hint: The spear is in move 3)