Here are the answers to the online chess puzzles numbers 17-19. I hope you found the solutions to all of them!
Chess Puzzle #17. The answer is d8/Q is checkmate. Obviously R-c8 is not mate as the king escapes on f7.
Chess Puzzle #18. The answer is Rxd8.  The black king is forced to capture the rook [...]

Here are three new chess puzzles that I know you will find challenging. As usual, I have included one for beginner level players, one for intermediate level players and one for the advanced players. All puzzles begin with white to play. Good luck!
Chess puzzle #17 is a
beginner level mate in 1.

 
Chess puzzle #18 is an
intermediate [...]

Here are the answers to the online chess puzzles numbers 14-16. I hope you found the solutions to all of them!
Chess Puzzle #14. The answer is Q-g2. The bishop on f1 can’t recapture as it is pinned by the rook on c1.
Chess Puzzle#15. The answer is N-e7, double check. The black king is forced to [...]

Here are three new chess puzzles that I know you will find challenging. I have included one for beginner level players, one for intermediate level players and one for the advanced players. All puzzles begin with white to play. Good luck!
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Chess puzzle #14 is a beginner level mate in one.

 
Chess puzzle #15 is an intermediate [...]

Here are the answers to the online chess puzzles numbers 11-13. I hope you found the solutions to all of them!
Chess Puzzle #11. The answer is B-f7. Many people incorrectly see B-d3 check, but this allows the black king to escape.
Chess Puzzle #12. The first move here must be a check because black has mate on the [...]

Here are three new chess puzzles that I know you will find challenging. As usual, I have included one for beginner level players, one for intermediate level players and one for the advanced players. All puzzles begin with white to play. Good luck!
Chess puzzle #11 is a
beginner level mate in 1.

 
Chess puzzle #12 is an
intermediate [...]