Custodian capture is a technical term in board game

Board game

A board game is a game which involves counters or pieces being moved on a pre-marked surface or "board", according to a set of rules. Games may be based on pure strategy, chance or a mixture of the two, and usually have a goal which a player aims to achieve...

s referring to a particular form of capturing.

It occurs when a player has placed two of his pieces on opposite sides of an opponent's piece. This mode of capture is unusual in most modern games and was most popular during the Dark Ages, particularly in Northern Europe. Some native games such as Mak-yek

Mak-yek

Mak-yek is a board game played in Thailand and Malaysia on an 8 by 8 board by two players each having sixteen pieces or "men."...

 still retain this form of capture.
Other games which use custodian capture: Hasami shogi

Hasami shogi

Hasami shogi is a variant of shogi .- Objective :The objective of the game is to capture five or eight of your opponent’s pieces.- Game equipment :...

, Ludus latrunculorum

Ludus latrunculorum

Ludus latrunculorum, latrunculi, or simply latrones is a board game played by the ancient Greeks and Romans...

, Tafl games

Tafl games

Tafl games were a family of ancient Germanic and Celtic board games played on a checkered or latticed board with two teams of uneven strength. The size of the board and the number of pieces varied, but all games involved a distinctive 2:1 ratio of pieces, with the lesser side having a king-piece...