## Solving Sudoku puzzle containing C shapesOther topics in this forumCycles and Twins X-Wing and Swordfish What makes a 'Difficult' puzzle Stripes Word puzzle query Alternate Pairs Trial and Error - The Labyrinth Is Sudoku a game of Mathematical symmetry? Is placing the correct candidates part of logic? Two out of three lines It's useful to look out for 'C' or similar shaped solved squares in a region. What I mean by this is an arrangement of one completed row/column of three with one other row/column with two squares solved. That can make the missing Sudoku square in that row/column easy to solve. In this case the 'C' is in region Click to download this puzzle Any comments ? Click here to contribute C Shaped? (re: C Shape) contributed by LynneNot sure I understand what you are on about here, Alexander. The shape is only very rarely a 'C' it can be any shape, I think you mean that there is one row of three and then row of two solved. As there is only one square left in the second row it's fairly obvious that this square should be worth checking to see if it can be solved. Any comments ? Click here to contribute Other Shapes (re: C Shaped?) contributed by AlexanderYes, that's more or less what I meant, poorly described, and I don't think 'C' describes the pattern very well anyway. It can be a completed sub-row (three squares horizontal) or sub-column (three squares vertical) in the same sudoku region. Then you need in the same region, another sub-row or sub-column with only two squares allocated and the rest clear. I think that makes lots of other shapes other than 'C'. My point was that the unallocated square in the sub-row or sub-column is often a good one to investigate. Look at the regions in the same row (or column) and see if any numbers are forced to go into that square. Any comments ? Click here to contribute Copyright © 2005-2015 Sudoku Dragon |