Here is a new approach to the Slippery King problem on 6x6x6 boards, somewhat inspired by the rules of Chinese Chess. Both checkmate and stalemate count as wins. Let the King move in six directions like a Wazir, but forbid all other Kings from entering any of the 26 adjacent cells. This choice of words will also exclude a 'friendly' King in a four player game.
level 1 - level 2 - level 3 - level 4 - level 5 - level 6
* R * | * * * | * * * 6
* * * | * * * | * * * 5
* * * | * * * | * * * 4
* k * | * * * | * * * 3
* * * | * * * | K * * 2
* * * | * * * | * * * 1
a b c d e f - a b c d e f - a b c d e f
WIN IN FIVE:
1.Rook 1d6-1d4 King 1c3-1b3
2.Rook 1d4-1c4 King 1b3-1b2
3.Rook 1c4-1c3 King 1b2-1b1
4.Rook 1c3-1c2 King 1b1-1a1
5.Rook 1c2-1b2 STALEMATE
Royal Exclusion Zone
Here is a new approach to the Slippery King problem on 6x6x6 boards, somewhat inspired by the rules of Chinese Chess. Both checkmate and stalemate count as wins. Let the King move in six directions like a Wazir, but forbid all other Kings from entering any of the 26 adjacent cells. This choice of words will also exclude a 'friendly' King in a four player game.