View unanswered posts | View active topics It is currently Fri Aug 14, 2020 2:11 am



← Back to the Calcudoku puzzle page




Reply to topic  [ 21 posts ]  Go to page 1, 2, 3  Next
 -1 to +4 puzzle 
Author Message

Posted on: Fri Dec 06, 2019 1:25 am




Posts: 753
Location: Ladysmith, BC, Canada
Joined: Fri May 13, 2011 1:37 am
Post -1 to +4 puzzle
Is there a "table" of possible combinations that would help in solving a -1 to +4 puzzle on this site?
I ask because my latest bonus puzzle is one of this type and I have spent almost 4 hours trying to solve it and never get close to a solution [cursing]


Profile

Posted on: Fri Dec 06, 2019 12:00 pm




Posts: 786
Joined: Fri May 13, 2011 6:51 pm
Post Re: -1 to +4 puzzle
beaker wrote:
Is there a "table" of possible combinations that would help in solving a -1 to +4 puzzle on this site?
I ask because my latest bonus puzzle is one of this type and I have spent almost 4 hours trying to solve it and never get close to a solution [cursing]


Hi, beaker. First my congratulations for your constancy and interest to solve the more difficult puzzles. The is not a table, as far as I know.
I have seen some of these in the books IIRC, but no one provided a step by step solution in the forum. And, in fact, there are different types like -2 to 3, -4 to 4, -1 to 7, etc..

The main problem is generally related to the subtraction cages, since the order of the operators may vary and that tends to confuse (you must consider all permutations, even starting in a negative number, while with positive integers you always depart from the higher number, then having less possibilities). Usually, the clues for this type, for instance in the -1 to 4, should be to study the position of the numbers 0, 3 and 2.

Perhaps if Patrick provides that puzzle (I assume you did not make a printout) we could help or propose some tip.

Best, clm.


Profile

Posted on: Fri Dec 06, 2019 7:46 pm




Posts: 753
Location: Ladysmith, BC, Canada
Joined: Fri May 13, 2011 1:37 am
Post Re: -1 to +4 puzzle
It is still available........I can print it out but then I do not know how to post the screen shot


Profile
User avatar

Posted on: Sat Dec 07, 2019 2:08 am




Posts: 277
Joined: Fri Jun 17, 2011 8:15 pm
Post Re: -1 to +4 puzzle
beaker wrote:
It is still available........I can print it out but then I do not know how to post the screen shot

I'm a little confused by your wording. If you took a screen shot then you can go to imgur.com, click on "new post" and then upload the picture. Patrick linked to more complete instructions for this earlier today.
If you need help taking a screen shot then I'd suggest doing a search for how to take a screen shot with your operating system.

I know you want to sort this out before you lose out on your next possible bonus becomes available so good luck.


Profile

Posted on: Sat Dec 07, 2019 3:52 am




Posts: 753
Location: Ladysmith, BC, Canada
Joined: Fri May 13, 2011 1:37 am
Post Re: -1 to +4 puzzle
where is the Patrick instructions......I am not that computer literate......too late as the 4 timed [color=#BF0000]points put me past point of no return.[/color].....someday I will have to find out the "imgur" procedure.....I have spent over 6 hours in the last 24 with this puzzle......am glad it is gone and I can quit obsessing about it (my 75 year old brain just would not let go of it).......sigh of relief


Profile

Posted on: Sat Dec 07, 2019 11:35 am




Posts: 786
Joined: Fri May 13, 2011 6:51 pm
Post Re: -1 to +4 puzzle
beaker wrote:
where is the Patrick instructions......I am not that computer literate......too late as the 4 timed [color=#BF0000]points put me past point of no return.[/color].....someday I will have to find out the "imgur" procedure.....I have spent over 6 hours in the last 24 with this puzzle......am glad it is gone and I can quit obsessing about it (my 75 year old brain just would not let go of it).......sigh of relief


Hi, beaker.

Here is the full solution.
First, we observe that cages a1-a2 and b2-b3 can only have -1 and 1 as candidates (the only way of having a sum of 0).

With all positive numbers (including the 0) and no 1 in, cage 8+ only admits (4,4,0), (3,3,2) or (2,2,4). The case (4,4,0) is inmediately eliminated since you would have a 0 in b6 and then the 2 in a5 is not possible. The case (2,2,4) is not possible since the 3 goes to a6 (>>> b6 = 0 and then a 0 is not possible in a5). Consequently 8+ must be (3,3,2).

The cage 1- in f3-f4 should be (-1,0), (0,1), (1,2), (2,3) or (3,4) (distance of 1 between the two candidates). Obviously, since the 0 is not possible (cage 0: up), only (1,2) is valid, then f3=2 and f4 = 1.

The cage 3+ (bottom right) can not contain a 0 or a 2. Additionally the 4 is not valid inside (because it would require -1 and 0 to add to +3), then only -1, 1 and 3 are inside (all different, it's not possible to repeat any of them), so we place a 1 in e6 and the pair (-1,3) as candidates in f5-f6 >>> cage 0: is (0,4).

Adding numbers in columns d and e (total sum of 20) we find that d4-d5 must sum 1, so this pair is (0,1) and then d5 = 1 and d4 = 0.

Now cage 3+ in e4-e5 has the candidates (-1,4) [only this option, because (0,3) or (1,2) are not valid].

A 3 in d1 is not possible since to have a sum of 3 in e1-e2 you would require (-1,4) or (0,3) or (1,2) and no one is possible. Then d2 = 3 and now, to complete 7+, d3 = 4 and e3 = 0. Consequently d1 = -1, e1 = 3 and e2 = 2. An we complete the two cages 0+ with a1 = 1 (a2 = -1) and b2 = 1 (b3 = -1). Then c3 = 1.

Next is to see that a 3 must be inside the 3-cell cage 2-, so a 0 must be the third candidate (it's quickly seen that other numbers are not possible: 4, 2 or -1).

With (0,3) in c5-c6 >>> b1 = 0 >>> a6 = 0 >>> a5 = 4 >>> b5 = 2. Adittionally b6 = 4. And f2 = 0, f1 = 4, c1 =2, c2 = 4.

An the rest is straight forward: c4 = -1, e4 = 4, e5 = -1, f5 = 3, f6 = -1, c5 = 0 and c6 = 3.

Now, let's see if either Patrick or yourself can upload the puzzle :-)

Image

pnm: here it is ^^^ [smile]


Profile

Posted on: Sat Dec 07, 2019 11:46 pm




Posts: 753
Location: Ladysmith, BC, Canada
Joined: Fri May 13, 2011 1:37 am
Post Re: -1 to +4 puzzle
Has any one followed the logic of clm.......only one question is that if d1 = -1 and 2e = 3 and e2 = 2, then how is it possible to add 3,2,-1 and get 6.....or did I read the sequence wrong


Profile

Posted on: Sun Dec 08, 2019 12:50 am




Posts: 786
Joined: Fri May 13, 2011 6:51 pm
Post Re: -1 to +4 puzzle
beaker wrote:
Has any one followed the logic of clm.......only one question is that if d1 = -1 and 2e = 3 and e2 = 2, then how is it possible to add 3,2,-1 and get 6.....or did I read the sequence wrong


Yes, you are right, thank you, beaker, the development is wrong from "Adding numbers in columns d and e ... ", the reason being that two columns do not sum 20, in this case, due to the presence of a -1, so the sum is 9 per column, that is, 18 in total.

I did it to quickly, I apologize for that, [scared] [scared], tomorrow I will correct from that point on.


Profile

Posted on: Sun Dec 08, 2019 1:41 am




Posts: 786
Joined: Fri May 13, 2011 6:51 pm
Post Re: -1 to +4 puzzle
The corrected development is this one:

First, we observe that cages a1-a2 and b2-b3 can only have -1 and 1 as candidates (the only way of having a sum of 0).

With all positive numbers (including the 0) and no 1 in, cage 8+ only admits (4,4,0), (3,3,2) or (2,2,4). The case (4,4,0) is inmediately eliminated since you would have a 0 in b6 and then the 2 in a5 is not possible. The case (2,2,4) is not possible since the 3 goes to a6 (>>> b6 = 0 and then a 0 is not possible in a5). Consequently 8+ must be (3,3,2).

The cage 1- in f3-f4 should be (-1,0), (0,1), (1,2), (2,3) or (3,4) (distance of 1 between the two candidates). Obviously, since the 0 is not possible (cage 0: up), only (1,2) is valid, then f3=2 and f4 = 1.

The cage 3+ (bottom right) can not contain a 0 or a 2. Additionally the 4 is not valid inside (because it would require -1 and 0 to add to +3), then only -1, 1 and 3 are inside (all different, it's not possible to repeat any of them), so we place a 1 in e6 and the pair (-1,3) as candidates in f5-f6 >>> cage 0: is (0,4).

Adding numbers in columns d and e (total sum of 18) we find that d4-d5 must sum -1, so this pair is (-1,0).

Cage 6+, not having 0's inside, could be (1,1,4) (which is not valid due to e6 = 1) or (1,2,3) or (4,3,-1).

Now we observe that d3 is not a 1 because it would require d2-e3 to be either (2,4) or (3,3) both impossible. Similarly d2 can not be a 1 since it would require d3-e3 to be (2,4). Than d1 = 1, so cage 6+ is (1,2,3) and e1-e2 = (2,3).

We can fill now a1 = -1, a2 = 1, b2 = -1, b3 = 1, d2 = 3, d3 = 4, e3 = 0 and c3 = -1. Also cage 3+ is (-1,4), and certainly e1 = 3 and e2 = 2.

In row 6, f6 = -1 and f5 = 3.

Next is to see that, in column c, c5 = 1 and c6 = 3. And this forces to select d5 = 0 (and not -1) to comply with the 3-cell cage 2-. Consequently d4 = -1, e4 = 4 and e5 = -1.

An the rest is straight forward: a5 = 4, b5 = 2, a6 = 0, b6 = 4, b1 = 0, f1 = 4, f2 = 0, c1 = 2 and c2 = 4.

Image

The solution, then, is:
-1 0 2 1 3 4
1 -1 4 3 2 0
3 1 -1 4 0 2
2 3 0 -1 4 1
4 2 1 0 -1 3
0 4 3 2 1 -1


Profile

Posted on: Sun Dec 08, 2019 6:03 am




Posts: 753
Location: Ladysmith, BC, Canada
Joined: Fri May 13, 2011 1:37 am
Post Re: -1 to +4 puzzle
Curious to know from other users if they have had one of these as a bonus configuration (-1 to +4)..........if not LOOK OUT!!!
Now, I can put this, finally, behind me....THANK YOU, clm


Profile
Display posts from previous:  Sort by  
Reply to topic   [ 21 posts ]  Go to page 1, 2, 3  Next

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
All forum contents © Patrick Min, and by the post authors.

Forum software phpBB © 2000, 2002, 2005, 2007 phpBB Group.
Designed by STSoftware.