Idea comes from game of Chess.
'Checking Field' spans among fields, and is capability to remove opponent's units if they move to position covered by 'Checking Field'.
If we cover opponent's escape with 'Checking Field', then move our unit(s) on attack position... then we can remove that unit from playing field.
i think this has use in Tactics.
Related topics, to be elaborated perhaps:
- Positional Chess,
- 'Sacrificing units' to remove 'Positionality'.
- Escort Field.