![]() ![]() ![]() Unfortunately it's not possible to fix the mess at this point, but I think we should do something at least. Here's more on my thoughts on the matter. Unfortunately "ER" was already used and named before Turbot Fishes, which I guess messed up the naming. It also means that the more logical name for ER would be "Grouped Turbot Fish". The standard name would be "Turbot Fish" but that's obviously ambiguous as well, because it's also the family name. So what is the corresponding pattern with a non-grouped box-based strong link? That's another annoying one. Furthermore, it's also less than clear whether ERs with just two candidates in the box-link are considered actual ERs or not, but I would prefer not so that ER would only mean a pattern with a grouped box-based strong link. At least some people (StrmCkr, rjamil) use "ERI" for the box-link only, which avoids some of the ambiguity. Sometimes "ER" is used like you just did, but the complete pattern has actually two strong links (like all Turbot Fishes): a box-based and a line-based one. "Empty Rectangle" is actually the most annoying pattern name I know because it has so many levels of ambiguity (even more than "Unique Rectangle" which is never clear whether it means just the deadly pattern or a solving pattern with the included guardians). Tarek Posts: 3761 Joined: 05 January 2006Īdding to the strength in location options is the Empty rectangle (which can be viewed as a strong link within a box). I'm looking at hopefully programming these into Sukaku explainer in the near future as "Easier to spot" techniques. I know that using so many terms (as SteveK mentions) is moot, but in a sudoku helper it may be helpful. Adding to the strength in location options is the Empty rectangle (which can be viewed as a strong link within a box). Just a note that Sukaku explainer supports both XY/XYZ wing and L1-wing (Colouring) under the name of "3 Strong links". (Note that I've replaced "candidates" with "digits" and added the corresponding wing-names and strong-link configurations.) 3 strengths in location, 3 digits : 元-Wing : LLL 3 strengths in location, 2 digits : L2-Wing : LLLĨ. 3 strengths in location, 1 digit : X-Chain (L1-Wing) : LLLħ. 1 strong cell, 2 strengths in location, 3 total digits : H2-Wing : VLLĦ. 1 strong cell, 2 strengths in location, 2 total digits : M-Wing / S-Wing : VLL / LVLĥ. 2 strong cells, 1 strength in location, 3 total digits : H3-Wing : VVLĤ. 2 strong cells, 1 strength in location (house), 2 total digits : W-Wing : VLVģ. 3 strong cells, 3 total digits : Y-Wing / XYZ-Wing : VVV / VVĢ. This is because the alignment between A3 and B9 means they both see six common cells.SpAce wrote: Code: Select all 1. This example starting with the hinge at A8 removes four 8’s from the first two rows. Either way the far corner at G1 can’t be a 4. Here is a classic Y-Wing beginning with the hinge at C4. BC and AC can see all the cells marked with a C where elimination can occur. A is a locked pair because they share the same row. In Figure 2 B is a locked pair because they share the same box. If our A, B and C are aligned more closely they can 'see' a great deal more cells than just the corner of the rectangle they make. It’s impossible for a C to live there and if C resides there it can be evicted. The cell marked with a cross can be 'seen' by both Cs - the cell is a confluence of both BC and AC. So whatever happens, C is certain in one of those two cells marked AC or BC. AC/BC is a complimentary pair, meaning they will both be either true or false. If AB turns out to be B then C is certain to occur in the top right. If the solution to that cell turns out to be A then C will definitely occur in the lower left corner. C is the common candidate between AC and BC. The bottom left cell marked AC is also bi-value and so is BC. B also only exists twice in its row.ĪB is a bi-value cell (it only has two candidates). That is the candidate number represented by A only exists twice in the column. Let’s look at Figure 19.1 for the theory.Ī is a conjugate pair and so is B. The forth corner is where the candidate can be removed but it leads us to much more as we'll see in a minute. The name derives from the fact that it looks like an X-Wing - but with three corners, not four. This is an excellent candidate eliminator (and is also known as XY-Wing).
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