Capture by surrounding a piece (custodian/enclosure)

[alexobviously]

In some games like hnefatafl and its variants, pieces don't capture by moving into an enemy piece like chess, instead a piece must be surrounded to capture it. See hnefatafl rules.

There are lots of complicated variations:

• Sometimes surrounding on two sides is needed (custodianship) and sometimes four (enclosure). This can vary between piece types in the game.
• Some squares can sometimes act as part of the capturing group.
• Sometimes all piece types can participate in capture, and sometimes it's only the pawn equivalents.

[alexobviously]

Also https://en.wikipedia.org/wiki/Mak-yek https://vi.wikipedia.org/wiki/Cờ_gánh