by Jeff Coakley
This column presents ten “Halloween problems”. They are called that because the pieces are wearing disguises. We know where they stand, but we don’t know their colour. Part of the solver’s task is to figure out which pieces are white and which are black.
The normal name for this type of puzzle is a colouring problem. The earliest compositions date from the 1960s. Here is a fairly basic example to get the party started.
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