Solution to Sudoku no 703

Sudoku no 703 (Tough)

Our younger son created this puzzle using a Javascript program which he wrote himself:

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Solution to Sudoku no 702

Sudoku no 702 (Easy)

Our younger son created this puzzle using a Javascript program which he wrote himself:

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Chess Solution no 7

20. g4  Rh8

21. Qxh8  Qxh2+

22. Kxh2   Kg5

23. Qh5+  Kf6

24. Qh6#

Chess Puzzle no 7

This is a minor variation of the final position in Dejan Antic v. Zoran Z Jovanovic, 21st Belgrade Trophy, 11th March 2008. White to play and checkmate in 5 moves:

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Chess Solution no 6

30. Rc1!

Black's queen must do something. He can either exchange it for a rook or move it and lose a rook for nothing.

Chess Puzzle no 6

This position is from Lovro Novosel v. Bruno Makovec, Croatian Cup 2023. White made one move and black resigned. What was it?

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Solution to Sudoku no 701

Sudoku no 701 (Tough)

Our younger son created this puzzle using a Javascript program which he wrote himself. It is right at the bottom of the tough category and only has one hard step:

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Chess Solution no 5

1. ...  Bg5+

2. Rxg5+  hxg5#

Chess Puzzle no 5

This position is from Vladimir Jr Bukal v. Teo Tomulic, Croatian Cup, 2023. White was due to play move 113 but seems to have resigned.

For the puzzle, assume that it is black to play and checkmate in 2 moves.

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Chess Solution no 4

27. ...  Qc1+

28. Kf2  Ne4+

29. Resigns

Chess Puzzle no 4

This position is from Meri Arabidze v. Alexandra Kosteniuk, FIDE Women's World Rapid Chess Championship 2022, Almaty, Kazakhstan.

White has just played:

27. Qg5?

threatening:

28. Qxg7#

How should black respond?

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Chess Solution no 3

 

1. Na3  Ka4

2. Nc2  Kb3

3. Nc4#

3. Nd4#

Chess Puzzle no 3

I created this puzzle myself. White to play and checkmate in three moves:

 

 

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Solution to Sudoku no 700

Sudoku no 700 (Tough)

Our younger son created this puzzle using a Javascript program which he wrote himself. It is at the bottom of the tough category and only has two tough steps:

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