Author Archives: rob

Puzzle 163: Dissection by Vertices

Another practice puzzle. Apologies for the lazy presentation. Also don’t be disappointed if you don’t find a nice logical path.

A photo of a hand-drawn dissection puzzle.

Dissection by vertices

Rules Split the grid into regions of size 1 through 8. All vertices where three region borders meet are marked by dots. There are no vertices where four region borders meet.

Or read the instruction booklet.

WPC 2018 review, part 2

Second part of my review, with the afternoon of day one. I wrote about the morning in part 1. The afternoon was made up of three long rounds (60 minutes and twice 90 minutes), starting from 14:00. One of the really nice things this year was the consistent and relaxed schedule, with a regular long lunch break from a few minutes past 12 to 14, long enough breaks, and precise starting times. (Besides that first round of the WSC which started 3 minutes early, but… people were consistently on time after that!) I felt that things had been a bit packed and rushed the last three years, so this was a very welcome change to me.

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Puzzle 161: Semitransparent Snake

Next one, a Semitransparent Snake. This was hardly worth constructing, since the competition puzzle was only worth 20 points. Also the type is somewhat dreadfully confusing. But, enjoy!

A semitransparent snake puzzle.Rules Connect Start to Finish by a standard snake. Clues count the visible snake cells. Along any straight segment of snake cells (in the direction start to finish), every 4th cells is invisible (from both directions).

Or see the instruction booklet.

Puzzle 160: Condensed Dominos

I’m starting to question my choice of posting all the linkable practice puzzles before the corresponding WPC review post… This is a great take on the standard Domino dissection puzzle that keeps the core while making it logically richer and less susceptible to uniqueness deductions.

Condensed Domino puzzleRules Partition the grid into areas of size three, such that each domino can be placed within one of the areas.

Or see the instruction booklet.

Puzzle 159: Inner Coral

Next WPC preparation puzzle, this one from round 5, Variations. You might as well call it a First Seen No-Islands Tapa.

An Inner Coral puzzle

Inner coral

Rules Shade some empty cells to form a Coral, compare Puzzle 27. The clue cells count as empty cells for the coral and can not be shaded. They indicate the lengths of the first blocks seen in each of the up to four directions.

Or better see the instruction booklet.