An Absolute Fork Attack, is where the attacking Pawn or Piece threatens any two pieces, one of which is the enemy King. In such a situation, because a King cannot remain in Check, it must absolutely move, resulting in likely capture of the other piece.
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The most desirable Absolute Fork attack is one where your opponent’s King and Queen are threatened (known as a Royal Fork.
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Absolute Chess Fork Attack
See one Absolute Fork example played by a Pawn and each applicable Piece, respectively …
White’s e-Pawn (red square) can create the Absolute Fork on e5 (green square), against Black’s two pieces (yellow squares), which are positioned to favor a double attack by a Pawn.
It’s only made possible by White’s Re2, which prevents Black’s King from making the capture, and likely losing his Queen to the LESS-valuable Rook.
White’s Nh5 (red square) can create the Absolute Fork on f6 (green square), against Black’s two pieces (yellow squares).
Note the the T-shaped pattern between Black’s pieces and the highlighted green square, which is within range of the Knight’s L-shaped maneuver.
White’s Bb3 (red square) can create the Absolute Fork on e6 (green square), against Black’s two pieces (yellow squares), which are incapable of defending themselves, or each other.
Neither Kc8 nor Nc6 can reach Be6 in one move; while Rf5 can’t attack diagonally.
White’s Re4 (red square) can create the Absolute Fork on e8 (green square), against Black’s two pieces (yellow squares), which are incapable of defending themselves, or each other in that position.
Kb8 can’t reach e8 in one move; Bg8 cannot capture along the straights.
White’s Qg3 (red square) can create the Absolute Fork on e8 (green square), against Black’s two pieces (yellow squares).
Black can at least block the check with …Re6-b6, with the Black c7-Pawn in position to capture the Queen (if Qxb6). There’s still a bit of work to do for both sides, in this example.