# Puzzle 90: Horse Snake

Here’s a Horse Snake puzzle.

Rules Shade some cells to form a snake which does not touch itself, not even diagonally. Head and tail are given. Clues indicate the number of shaded cells that are a knight’s step away from the clue. Clues can’t be shaded.

(I’m pretty sure you can drop the “can’t be shaded” part and solve this as a “transparent” Horse Snake.)

# GP standings

Some quick notes on how to get the GP score tables into a useful shape, in order to be able to compute something like the below top 10 by best four results in the first five GPs (using preliminary results for GP 5). So I don’t have to figure this out again next time, and so you can play along at home.

``` rank |            name            | points
------+----------------------------+--------
1 | Ken Endo                   | 3706.7
2 | Ulrich Voigt               | 3285.9
3 | Hideaki Jo                 | 3235.5
4 | Kota Morinishi             | 3102.1
5 | Nikola Zivanovic           | 3054.5
6 | Robert Vollmert            | 2905.2
7 | Will Blatt                 | 2896.7
8 | Prasanna  Seshadri         | 2834.7
9 | Yuki Kawabe                | 2834.5
10 | Michael Ley                | 2806.7
```

The scripts used to do this are available here.

# Puzzle 89: Kakuro Anti-Knight

We’re currently running a review series for the 2016 24 Hours of Budapest on croco-puzzle. I made this Anti-Knight Kakuro, a type which occurred in Tawan‘s set. It turned out to be a bit too hard.

Rules Solve as a standard Kakuro. In addition, equal digits must not be a knight’s step away.

# GP video

One more GP round over, with the US round last weekend. While we’re waiting for results, here’s a video recording of my solve. (I’ve been recording the last few, prompted by Endo Ken; GP round 4 where I did relatively terribly is still missing for technical reasons.)  No idea where this puts me, but I should definitely work on my Slitherlink solving.

# Puzzle 87: Tom-tom

One more Tom-tom puzzle. That’s it for the series.

Rules Fill the grid with digits 1-7, so that no digit repeats within a row or a column. (Digits may repeat within rooms.) Clues indicate the result of applying a basic operation (addition, subtraction, multiplication, division) to the digits within that room, starting with the largest digit.

Or see the instruction booklet.

# Puzzle 86: Tom-tom

One Tom-tom puzzle.

Rules Fill the grid with digits 1-7, so that no digit repeats within a row or a column. (Digits may repeat within rooms.) Clues indicate the result of applying a basic operation (addition, subtraction, multiplication, division) to the digits within that room, starting with the largest digit.

Or see the instruction booklet.

# Puzzle 85: Nanro Signpost

One more Nanro Signpost.

Rules Shade some cells, so that all shaded cells are connected, and such that shaded cells don’t fill any 2×2 square. Clues indicated the number of shaded cells in an area; each area must have at least one shaded cell. Whenever two shaded cells touch across walls, the number of shaded cells within both areas must be different.

Or see the instruction booklet, with a somewhat different formulation of the rules.

# Puzzle 84: Nanro Signpost

One more practice puzzle, a Nanro Signpost.

Rules Shade some cells, so that all shaded cells are connected, and such that shaded cells don’t fill any 2×2 square. Clues indicated the number of shaded cells in an area; each area must have at least one shaded cell. Whenever two shaded cells touch across walls, the number of shaded cells within both areas must be different.

Or see the instruction booklet, with a somewhat different formulation of the rules.

# Puzzle 83: Pentominous Borders

Another Pentominous Borders, presumably closer to what we’ll get on the GP.

Rules Split the grid into pentominos by placing some walls between cells. Pentominos that touch by an edge must be different, where two pentominos are considered the same if one can be rotated and/or reflected to become the other. Some walls are already given. Black cells aren’t part of the grid.

Or see the instruction booklet.