Elementary Chess Endings: Mate in One

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Ten fairly elementary chess problems are shown, in which White is to move and force checkmate. You have found the correct move when "CHECKMATE!" appears. Any other moves, legal or illegal, are ignored. Try again until you get it right.
Contributed by: S. M. Blinder (October 2013)
Open content licensed under CC BY-NC-SA
Snapshots
Details
Snapshot 1: starting game: "a very complicated position"
Snapshot 2: "fool's mate": mate after only four moves
Snapshot 3: one possible mate with two knights; however, it is difficult to maneuver into this final position
The definitive reference on chess endings is R. Fine, Basic Chess Endings, ed., New York: McKay, 1941.
Permanent Citation
"Elementary Chess Endings: Mate in One"
http://demonstrations.wolfram.com/ElementaryChessEndingsMateInOne/
Wolfram Demonstrations Project
Published: October 21 2013