Sanaku Challenging Sample

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Sanaku Challenging Sample

Postby koushanejad74 » Mon Aug 05, 2019 4:37 pm

Sanaku is very similar to Hashiwokakero=> http://cross-plus-a.com/puzzles.htm#Hashiwokakero

The rules are the bit different though:

The goal is to connect all the islands(Circles) by drawing a series of bridges(Lines) between the islands. The bridges must follow certain criteria:
• Bridges must not cross each other.
• They may only run horizontally, vertically, or diagonally (45 degrees)
• At most one bridge connects a pair of islands.
• The number of bridges connected to each island must match the number on that island.
• The bridges must connect the islands into a single connected group.
• Some bridges are given initially, the goal is to find the remaining bridges

Note: Dotted gray lines show possible bridges, it's just to help you solve the puzzle, not a constraint

Here's a sample:

Netwrok9_NotEasy.png
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Donwload PDF version here:

Netwrok9_NotEasy.pdf
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koushanejad74
 
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Re: Sanaku Challenging Sample

Postby SpAce » Mon Aug 12, 2019 7:55 am

Has anyone solved this? Seems too tough for me :shock: I get ten bridges easily and then nothing (but some eliminations). So many candidates left that I can't even envision an effective T&E strategy (nor would feel like implementing it anyway). What am I missing?
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Re: Sanaku Challenging Sample

Postby koushanejad74 » Mon Aug 12, 2019 1:41 pm

SpAce wrote:Has anyone solved this? Seems too tough for me :shock: I get ten bridges easily and then nothing (but some eliminations). So many candidates left that I can't even envision an effective T&E strategy (nor would feel like implementing it anyway). What am I missing?


Make sure you don't create Islands ( a set of nodes that are disconnected from the rest ) , basically every node must connect to at least one node that has number greater than 1,
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Re: Sanaku Challenging Sample

Postby SpAce » Mon Aug 12, 2019 2:24 pm

koushanejad74 wrote:
SpAce wrote:Has anyone solved this? Seems too tough for me :shock: I get ten bridges easily and then nothing (but some eliminations). So many candidates left that I can't even envision an effective T&E strategy (nor would feel like implementing it anyway). What am I missing?


Make sure you don't create Islands ( a set of nodes that are disconnected from the rest ) , basically every node must connect to at least one node that has number greater than 1,

Of course, that's basic. I look at deadly patterns like 1-2-2-2-1 (and longer and more complex ones too) to see if avoiding them forces some bridges or at least blocks some connections. Another thing I do is to see if some connections (especially longer ones) would block some islands from having their fill etc (and if so, those connection possibilities can be eliminated). I've used those techniques here as well, but I still can't seem to advance past the first ten (new) bridges. I get some further eliminations, but I still can't see significant openings. Either this is actually difficult, or I'm just blind to something.
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Re: Sanaku Challenging Sample

Postby tarek » Mon Aug 12, 2019 4:36 pm

Do these puzzles have a rating or solving time?

A walk-through example would also be helpful

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