Solutions to Piet Hein's puzzles

Puzzle 1
R11 C11 Q1 Vd1 Vd2 Vd3 Vd4 Vd5 Vd6 Vd7 Vd9 Vd10 Vd11 Vh6 Vh7 Hc2 Hd8 Hh9 Hi4 H1f7 +g5 +g8

No matter what Red does, Blue can connect via either g5 or g8. Both blue stones at the right are connected to the right (see the Strategy guide for details). The stone at d8 is connected to the left because of the ladder breaker at c2.

Puzzle 2
R3 C3 Ha1 Va2 Vb3 N:on Hb2

Puzzle 3
R6 C6 Vc3 Vf3 Vd5 Hb1 Hb5 N:on He2

Puzzle 4
R4 C4 Vd1 Va4 Hc2 N:on Hb3 Using twice edge template III 2b

Puzzle 5
R4 C4 Va4 Ha1 N:on Hb3

Blue 1 is connected to the right via Template IIIa and threatens to connect directly to the left. The only possibility to prevent this connection is to play out the ladder:

R4 C4 Va4 Ha1 N:on Hb3 Va3 Hb2 Va2 Hb1

Since the cells for the ladder and those for the edge template do not overlap, Red cannot do anything against the connection.

Puzzle 6
Not posted yet...

Puzzle 7
Not posted yet...