The fork.

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peeko4

In chess, a fork is a tactic whereby a single piece makes two or more direct attacks simultaneously. Most commonly two pieces are threatened, which is also sometimes called a double attack. The attacker usually aims to gain material by capturing one of the opponent's pieces.

peeko4

heres a puzzle 1 move long, white to move, and white has to fork.

 

stupnik_2_0

Draw

peeko4

so?