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This is not my puzzle. Source: Reddit
This puzzle is part of Monthly Topic Challenge June 2026: Same grid, different execution. Mark some cells half-shaded along a diagonal (one half white, one half black), so that ev...
Is it possible to place a king (K), a rook (R), 2 knights (N), and 2 bishops (B) into the following chess grid of 12 squares so that no piece attacks any other piece? If yes, how m...
A use of the Monthly Topic Challenge grid. The below 15 by 15 grid has 160 white cells. But though that number is divisible by two, it's impossible to tile the grid with dominoes1....
I'm all primed to start the game, but I forgot what we were supposed to be playing. Can you folks help me get this sorted out?
In the following position, with black moving up the board, we know that it is possible to ensure that each square is either attacked or occupied by a black piece within 11 moves -...
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