in search for keymoves,all possible moves are evaluated.. tthe author of the puzzle has put puzzle blinders as detterence to not locating the final square of the king or defensive moves that are still available to prevent its capture. perhaps we have to switch to the authors mind to solve it easily.ittakes a thief to catch a thief, so it takes an author mind to catch also an authors mind perspective.the aim of every puzzle is to make chess difficult for the unprepared mind.

