
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
What is the minimum number of kings that must be placed on a chessboard so that they attack all the cells not occupied by them? (A king attacks the cells adjacent to its cell by side or corner).

Present the answer in LaTex format: \boxed{Your answer}
user