Piet Hein's puzzles

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These are a few puzzles designed by Piet Hein. Their respective solutions can be found on Solutions to Piet Hein's puzzles.

Puzzles

Puzzle 1

Blue to play and win.

Piethein1.png


Puzzle 2

Blue to play and win.

Piethein2.png


Puzzle 3

Blue to play and win.

Piethein3.png


Puzzle 4

Piethein4.png


Puzzle 5

Blue to play and win.

Piethein5.png


Puzzle 6

On the board of size 3 there are precisely two opening moves such that, with optimal play from both players, the board will be completely filled before the game is over. Which are the two opening moves?

Puzzle 7

Blue to play and win.

See also