Chess Tactics Pro (Puzzles) – Apps on Google Play

10 Easy Chess Puzzles for Beginners –

Mate in Two Chess Puzzle - SparkChess

500 Chess Puzzles, Mate in 2, Beginner & Intermediate Level: Solve chess problems and improve your tactical chess skills (I'm progressing in Chess)

hard chess puzzles – Daily Chess Musings

Checkmate in One Move: A Collection of 500 Chess Puzzles with Solutions

Hardest Checkmate in 1 - Chess Forums

Mate in 4 Chess Puzzle 1 - Brain Easer

Chess Game #8: Checkmate In 1 Move, Black To Play

Chess Self Teacher: 500 Checkmate Chess Puzzles in One Move, Part 7 (Paperback)

checkmate - What is the solution to this mate in 2 puzzle? - Chess Stack Exchange