This situation can be disguised, for example consider the figure below. It is the same situation, but the extra mined square on the right has increased all the numbers by 1.
Egoera mozorrotu egin daiteke. Aztertu hurrengo irudia. Egoera berdina da, baina eskuineko laukiak ere mina bat du, eta, beraz, zenbaki guztiei 1 gehitu zaie.