A conversation about Ripple Effect
Today our theme is Ripple Effect. It's a comparatively new puzzle. There hasn't been a lot of talk about Ripple Effect. What kind of a story can we expect to hear here? The guests are Turing-Joe Jr. and T. Karino. From Nikoli we have Nob and NyanBaz.
NyanBazToday we will talk about only Ripple Effect.
NyanBazYou got something wrong there. You make a lot of good problems, so we invited you. The other day Turing-Joe Jr. told of his deep contemplation of Ripple Effect in an interview. How about you, T. Karino? Is it just one puzzle among many puzzles?
NyanBazReally!? But, you have more Ripple Effect problems published than other authors.
NyanBazYou may be on to something, Ripple Effect may be a puzzle where it is hard to create problems for any author.
NyanBazDid you write the program for that by yourself?
NobDo you check problems with your own program, too, T. Karino?
NobWhen I notice something having failed, it's difficult to get back on track later. It's difficult to change the shape of a room or cut it into smaller bits.
NyanBazDo you cut up rooms after they are set, too Turing-Joe Jr. ?
NobWhen Ripple Effect first appeared in Puzzle Communication Nikoli, there were few contributions of easy problems. I had to make an easy problem because I was the chief editor in those days and I remember that I had a hard time getting it right. It's very difficult to make easy problems with Ripple Effect. I could understand why there were few contributions of easy problems. (laughs)
NyanBazIt becomes difficult when it uses big numbers.
NyanBazWell, authors find it difficult to make them, but they are popular among solvers. In nikoli.com, there are more people solving Ripple Effect than similar Sudoku.
NobThere are fewer problems that need hard solving methods like Sudoku. Ripple Effect will be solved correctly if you make a steady effort.
NyanBazBut there has to be something where Ripple Effect is different from Sudoku.
NyanBazGood point, when you think about 1, you only have to watch the next cell. It's different with Sudoku. You have to look out for 1s in Sudoku all over the place. Because you know you just have to look at the near neighborhood, is that why it is liked?
NobWhen you make the problems, you can use reservation a lot too. For example, 2 and 3 both must be in one of at most two cells, because there will be no other numbers in those two cells.
NobWhen a difficult method like "reservation" is necessary with Ripple Effect, it suddenly becomes hard.
NyanBazYour problems don't call for many difficult methods Turing-Joe Jr. Are you careful not to use difficult methods a lot?
NyanBazAh, that is how you do it.
NyanBazIt's interesting that you guys think differently about it.
NobYou are able to steer towards something special to look for with the shape of the rooms. With Ripple Effect, you aim for that, and you can actually realize it. Amazing ability!
NyanBazIt may fail at other places, and then it may become possible to solve from another place by some different method. It's difficult to get it completely right.
NobAnyone can put a 1 into a one cell room.
NyanBazAre there any thoughts about the numbers that are shown from the beginning? Do you want to reduce the number of those if possible?
NobHow about you Turing-Joe Jr.? You go out of your way to make the placement of the numbers symmetrical.
NobYou are thinking about even that!
NobSAKAMOTO, Nobuyuki makes problems that have a lot of numbers. How do you think about that type of problems? Is it OK or what?
NyanBazLet's think ahead. Is there a future for Ripple Effect?
NyanBazWhat kind of direction is it going in? I wonder it will become a puzzle for just some enthusiasts when we pursue hard ways of dealing with it.
NyanBazThat's for sure. There would still be room for ideas about how it looks.
NobHow about large rooms? The current mainstream in Ripple Effect thinking is for a problem to advance little by little from small rooms with small numbers. You can reverse it when you use big rooms well. The development becomes dynamic when big numbers influence remote rooms like you are making potshots.
NyanBazWell. Ripple Effect is still growing up. Last here today, anything that you guys want to tell solvers?
NyanBazThank you for today! Let's enjoy Ripple Effect, all of us together.
Discussion on Oct 2011 Published on Jul 22, 2014