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yakov  ·  2546 days ago  ·  link  ·    ·  parent  ·  post: A puzzle: How to most quickly destroy the tank?

I am not convinced that you've shown that it cannot be done in fewer moves. It seems that you are begging the question: why must you necessarily bomb all the black squares at once?

In fact, it is not necessary: I can think of many other sequences that destroy the tank in 2521 moves.