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Interception or closing a line is a chess tactic similar or synonymous to Interference, with the aim to interrupt a defense trajectory of an opposing sliding piece, often a queen in conjunction with defending mate threats. The intercepting move, typically a threat by itself, has a negative SEE value, but its target square is at least one time defended by an other piece of the attacking side, so that the defending queen can not capture without losing material to perpetuate the defense, while opponent winning captures close the line to disconnect the queen from defense. Interception is the domain of the search, while such SEE losing interception moves might not be pruned near the tips.

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