=Lizard=
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Why did you dock at the dock? Maybe one person docked, and the other chose a castle to see which is better for killing?
By the way, that's an interesting option.
We could do it like this: flip a coin to decide who gets to choose either the color or the castle. If the winner of the coin flip chooses red, then blue chooses – either the dock or any other castle. Accordingly, red will be left with either any castle except the dock, or the dock. I hope I didn't confuse you ;).