anderson's Puzzle Blog

Puzzle 23: Black Hole Tapa

with 8 comments

Rules (copied from the TVC instruction book): Follow regular Tapa rules. Additionally, each row/column must contain N Black Holes. Black Holes must be placed on the Tapa wall. For the purposes of surrounding clues, a cell with a Black Hole counts as M consecutive shaded cells instead of 1. Black Holes may touch each other. N and M will be given in Puzzle Booklet.

Also, in this puzzle, one of the clues has a 0 in it. I think the meaning of this should be natural, but just to be precise, the 0 must correspond to a non-empty group of black cells whose total length (adjusted for black holes) is 0.

Edited to add one more clarification: Even though the black holes count as 0 for clue purposes, they still count as black squares for everything else (black holes count for connectivity, you can’t have a 2×2 square of black holes, etc.)

blackholetapa

Notes: Well, I suppose I’m still alive. 😛

After going to the WPC (I’m currently writing a recap and hope to have it finished at some point), I’ve been motivated to get back into making puzzles after I basically had no time at all the past year due to school/burnout. So, have some TVC practice! Although I’m not sure whether this puzzle is representative of a typical Black Hole Tapa, as M=0 is a little unusual heh.

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Written by qzqxq

December 1, 2016 at 11:51 pm

Posted in Puzzles!, Tapa, Variations

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8 Responses

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  1. > Also, in this puzzle, one of the clues has a 0 in it. I think the meaning of this should be natural, but just to be precise, the 0 must correspond to a non-empty group of black cells whose total length (adjusted for black holes) is 0.

    That is not the “natural” meaning, since in Power Tapa (also in the same TVC), a 0 (acting as a clue) is simply ignored. So it’s good that you specify what it means.

    chaotic_iak

    December 2, 2016 at 12:14 am

    • Oh yeah, that’s a very good point.

      I still feel like this interpretation is the “correct” one. Like, if a tapa variation involves fiddling with the clues in some way so that you can end up with a zero sharing a box with another integer (power tapa, or that variation where each clue is +/- 1), then it seems okay to ignore the resulting 0. But black hole tapa isn’t a variation where you fiddle with clues, so it feels a little inelegant to introduce an extra rule of “the solver also has to fiddle with the 0 clues to determine whether to ignore the 0.” I think here it makes most sense to use the standard tapa rule of “each number corresponds to exactly one group.”

      I’m just rambling at this point though. Hope you enjoy(ed) the puzzle!

      qzqxq

      December 2, 2016 at 2:24 am

      • Since a 0 clue can appear even in normal Tapa, I prefer to think that 0’s in Tapa have a special meaning of simply being ignored. (Then, in normal Tapa, a clue of “0” means that it doesn’t indicate any black group. But the cell itself is a cell with clues, meaning that all black groups around it are clued; since there’s no number indicating anything, it must mean there is no black group.) Of course, yes, this is also a valid interpretation of extending the usual meaning to 0’s, but I wouldn’t call that the normal interpretation.

        The puzzle itself was nice; an interesting twist and an interesting application of the rule, too (that got used several times; three, I think?).

        chaotic_iak

        December 2, 2016 at 9:09 am

  2. ” the 0 must correspond to a non-empty group of black cells whose total length (adjusted for black holes) is 0 ” . What does non-empty group of black cells mean ?

    Is the 05 clue same as a 5 clue If so why an extra zero then ?

    skynet

    December 2, 2016 at 11:43 am

    • It means that there needs to be a group of black cells which consists only of black holes. So, for the 05 clue, you can deduce that there must be a group of 5 black cells that are not black holes, and a group of 1 black hole cell.

      Basically, the amount of numbers in a clue cell is always equal to the number of groups of black cells surrounding the clue (where black hole cells also count as black cells, as per the rules). Sorry for the confusion, I should have worded it better. 😦

      qzqxq

      December 2, 2016 at 6:40 pm

      • Ok now I get it.Another query.I presume black holes are considered to assist in tapa connectivity ?If so , in this puzzle since black hole is nothing but an “invisible hole” due to its length of zero, it cannot assist in connectivity.But I just don’t see a a way to connect the left half and the right half of the puzzle without using atleast 3 shaded cells in the centre which would violate any of the clues given in the middle.Where am I going wrong ???

        Skynet

        December 3, 2016 at 2:25 am

        • Black holes still assist in connectivity, because they are still black squares. They only count as 0 for clue purposes. I can see this is also a little confusing, so I’ll edit the rules to add that.

          qzqxq

          December 3, 2016 at 3:05 am

  3. Loving the clever twist on the genre! And nice job finding a more consistent use for the 0 clue 🙂

    bmcfluff

    December 6, 2016 at 7:56 pm


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