Learn the swordfish strategy for solving sudoku puzzles, with easy solving hints and help on how to get sudoku answers, in this free math game strategy video.
I'm showing you tips and techniques in solving Soduku puzzles. I'll be showing you another example here of a master strategy called swordfish. We removed all the other notations just to make it easy to figure out. Those are the ones that can only be 4 in this example here. But just like our last strategy of X wings, this works over 3 instead of 2 columns. Basically, it says that if this one is a 4, this can't be a 4. So if this one's a 4, this can't be a 4 also. It's another way of eliminating options so doing the same way. It's basically just a 3 column X wing is what it basically is. It's just another way of eliminating values because you know if that is a 4, that can't be a 4, if this is a 4, that can't be a 4. It's good for later on because you keep that in mind when you take a look at this example when you fill in the rest of these values that you know if this one automatically becomes a 4, that one no longer can be a 4. That's basically another process of elimination. It's just like an X wing. However, over all 3 different columns and rows. In our next master technique, we'll show the technique of forcing chains.