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Close-up of wooden chessboard with beige pieces

Photo by betacam on FreeImages

Themed Checkmate Compositions

Puzzle
These are my first compositions, and I think they're all quite pretty. Hope you enjoy :)

There are three puzzles here, each sharing a common theme. For the sake of those who like to solve without using any hints, I left the explanation of the theme for the end of the post. Each composition is white to play with a forced mating sequence.

Mate in 9

https://lichess.org/study/26pg11wf/c5l9IrJ4

Mate in 8

https://lichess.org/study/26pg11wf/Kjg59lNz

Mate in 7

https://lichess.org/study/26pg11wf/VUqJax3F

The Theme

king.png
Each mating sequence relies on one or more king moves. The purpose of the king move or moves is different in each puzzle.