(military) The defence of a single object or a limited area, such as a ship or a building.

Alternative form of Petrov Defence

A chess opening beginning 1. e4 e5 2. Nf3 Nf6.

The concept of an armed attack on another state, when not at war, on the belief that the other state represents a real attack threat. It differs from a preemptive strike which applies to states which are already at war.

A chess opening, a form of Indian Defence, characterised by the moves 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4.

(chess) A chess opening, a form of Indian Defence, characterised by the moves 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+.

Alternative form of personal defense weapon

plural of personal defence weapon

(chess) A chess opening characterized by the moves 1.e4 c6, in which the white king's pawn advances two squares and the black king's bishop's pawn advances one square.

Alternative form of Two Knights' Defence