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| Chessboard Alignment |
 Title text: Luckily, the range is limited by the fact that the square boundary lines follow great circles. |
Explanation
this comic shows various chess boards, and a piece travelling between them, with the joke being if you align the boards, you can move across them. This is not legal in normal chess [citation needed], but is shown here
the title text refers to, how, due to the lines being great circles, the line will eventually come closer at far enough range and not be millimeter accurate.
Transcript
It doesn't happen often because it requires micrometer precision, but if two chess boards are perfectly aligned, it's actually legal to move pieces between them.
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