#3177: Chessboard Alignment
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[An aerial view of three chess-games, with six players shown, in each case with white at the near-side of board (towards the bottom of the comic panel) and each having reasonably developed game positions.]
[The middle board has yellow highlight on the squares from white's King's Bishop's original position, diagonally forward-right to the respective edge square of the board, then four more squares in the gap between boards until ending on the black Queen's Rook square of the right-hand board, which appears now to have three white bishops, one of them on this rook's starting square.
[There is just one black rook, elsewhere on the right board, whether or not the other was lost to middle-board's bishop, and the middle board has only one bishop (and is lacking three pawns, with just two others still in their starting positions), for white, with apparently their King sent forward-left by two successive diagonal moves but no other major pieces having noticably relocated.]
[The middle board's near-side player has now also moved across to pay attention to the right hand board, leaving only his opponent facing his original board.]
[Text below the main scene's panel:] 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.
(Sourced from explainxkcd.com)
Title text:Luckily, the range is limited by the fact that the square boundary lines follow great circles.