Tutorial 1

Tutorial 1 - Full Editing

On startup, the currently selected puzzle file is xsudon.sud. This file contains the tutorials and a several other examples. This file is the main working file and cannot be erased.

Open the Tutorial One Puzzle

· Click the right tab of the puzzle list in the toolbar.............

· Scroll up and click on the puzzle called Tutorial 1.

· Click on the load puzzle icon to the right.

You will now see Tutorial 1 puzzle without any logic.

Entering Logic Manually

Place a Cell Truth using the Cell Menu

· Right click on any candidate in r4c5. This opens the Candidate Menu.

· Select [Add_Sub Truth] and then [Cell] in the submenu.

Cell truth 4N5 appears, as recored in the log window

Place a Cell Truth using the mouse

· Left click on any candidate in the another cell, r5c5.

· Left click on any other candidate in the cell.

Cell truth 5N5 appears

Place 6 more Cell Thuths

· Repeat the above to place 2 more truths in cells r6c5 and r9c5.

· Repeat again to place 4 truths in cells r4569c6 (written in compressed notation).

The grid should look like this, with 8 cell truths:

Save your work

· Go to the [ Load/Save ] menu at the top left and select [Save As New Puzzle].

· In the Edit Info popup, add the word "work" after "TUTORIAL 1".

· Click OK to save the puzzle.

This saves a new copy of the puzzle at the end of the puzzle file. This puzzle becomes the default and will open the next time a puzzle is loaded or the program starts.

Place a column link, using the Candidate Menu

· Right Click candidate 6r9c5, to open the Candidate Menu.

· Select [Add/Sub Link (cover set)] / [Column] to add a column link.

Column link 6c5 appears as light transparent green.

Entering links using the mouse

Select the link entry mode.

· Left double click the mouse at a safe place outside the grid.

The Left Double Click toggles between link entry and truth entry modes. In the link entry mode, the cursor becomes a pencil.

Place column link 7c5.

· Left click the digit 7 in r4c5 to select the digit.

· Then left click the digit 7 in r6c5 to place the link.

Place 4 more column links

· Select digit 8r9c5 then click 8r9c5 to place column link 8c5.

· In the same way, link any two digit 8s in column 6 to place link 8c6.

· Link any two digit 1s in column 6 to place link 1c6.

· Link any two digit 2s in column 6 to place link 2c6.

There should now be 6 light green column links.

Placing box links

Place 2 box links

· As above, left click candidate pair 9r5c5-9r6c6 to place box link 9b5.

· Left click candidate pair 5r5c5-5r6c6 to place box link 5b5.

Bingo. 9 eliminations appear, and the grid should look like this:

Placing box links, the Alt Key

The previous candidate pairs are in the same box but not the same row or column, thus Xsudo knows to enter a box link. When 2 candidates share a box and a row(column), the Alt Key is used to tell Xsudo to enter a box link.

Place 2 more box links

· Left click candidate 8r9c5, then Alt-Left click 8r9c6 to enter link 8b8.

· Left click candidate 8r4c5, then Alt-Left click 8r4c6 to enter link 8b5.

Bingo. 3 more eliminations for digit 8 appear, becasue of a second group of 8 cover links where 6 of the links overlap with the previous 8 links, something like 8 + 8 = 10!

Viewing logic in 3D

Viewing logic in 3D can sometimes help show details. The following is a brief tour of 3D.

Note, a small crosshair marks the position where a view is frozen.

Switch to 3D and 3D Viewing

· Place the cursor near 5r5c5 (spatial center) and double right click the mouse.

· Move the mouse up/down and left/right to rotate the view.

· Freeze the view at a desired position with a single rightclick.

· Single rightclick again on the small crosshairs to continue rotation.

· Return to 2D by double rightclicking anywhere in the grid.

Auto Placing Links

Links can be placed automatically while editing or all at once after the truths have been entered. To demonstrate this, the links are first erased.

Remove all links

· rightclick on any candidate to bring up the Candidate Menu.

· Select [Add-Sub Link] / [Clear All] to clear all links.

Edit modes: Edit Modes are selected with the [CAT] icons in the top toolbar where

· [C] : Edit as Candidates, Auto fill truths and links.

· [A] : Edit as Truths, Auto fill links.

· [T] : Edit as Truths. Manually place truths and links.

Auto Fill links

· Select the [A] in CAT to switch to auto fill mode.

· Select the [T] in CAT to return to the manual entry mode.

The auto fill mode will place all useful links, in this case there are 8 truths and 11 links, which are a comination of 3 cover groups causing 13 eliminations.

Advanced Logic Funtions

The following functions can be used with logic in the grid. They are found in the [LogicTools] menu. See Logic Menu Description.

The first group is used for manipulating logic:

- [Find All Eliminations]. Find all eliminations/assignments for these truths.
- [Convert Truths to Links]. Convert unneeded truths to links.
- [Remove Unused Links]. Remove unneeded links.
- [Find Base/Cover Sets]. Find a base/cover set group for this logic.

Another group of functions are used for find individual cover set groups:

- [Find Cover Set Groups]. Finds cover set groups.
- [Edit This Cover Group]. [Enter] Place current cover set group in the grid editor.
- [Edit All Cover Groups]. [Shift Enter] Place all cover set groups in the grid editor.
- [Return to Edit]. [Escape] Return to the previous logic in the grid editor.