I would like to be able to convince myself of the possibility (or lack thereof) of mate using various piece combinations in which the attacker doesn't use their own king.
I'd like to approach this by playing against a strong engine. I'd need to play both the attacking and defending sides at times to get the most out of this as a learning exercise.
If I play the attacking side, I can simply voluntarily not use my king.
If I play the defending side, I can't tell the engine to voluntarily not use it's king. So, for cases where I play the defending side, I need to set up a piece configuration that makes use of the attacker's own king impossible.
So, this post addresses only the case where the engine is attacking and I am defending.
It sounds like some sort of blockade of the attacking king is needed.
The problems I keep hitting to ensure the attacking king can't enter the game are:
- Any attacking piece used in the blockade must be immobilized (along with the attacking king)
- Any defending piece used in the blockade must be immune from capture
- Ideally, any defending piece used in the blockade would also be immobilized. Though I can voluntarily forego moving any defending piece that has available moves, the existence of any such moves might influence the engine's behavior.
So, this has become a learning exercise unto itself. It feels like locked, opposing pawns are key to the solution, but the above problems keep arising. I feel like I am at an impasse.
Does anybody know of a way to do this? Or is it impossible?