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# Cage Comparison

Documentation to be done

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## ... by: JohnNoneDoe

There is a Killer Sudoku board I would like you to look at

http://www.sudokuwiki.org/killersudoku.htm?bd=112212211231111123233444223133121221122121331212121312212312312414312414444414444,080015002507001300062300000000002014000000190000000000080000151317000011002200000000200000131700000000001703000000091609000000270000000000380000000000000000000000

The solver fails on this board. It can be easily solved using what I think is an application of cage comparison. The 13-in-2 cage at a78 cannot contain 6,7 because of the 15-in-2 cage at a34. Thus the 5 cell innie in box 3 summing to 45-13-14=18 must contain a 7, 18-in-5 is 12357.

## ... by: JohnNoneDoe

Below is a board that thwarts the solver.

There is a Killer Sudoku board I would like you to look at

http://www.sudokuwiki.org/killersudoku.htm?bd=112212211213313312244212442114232411112131211232121232231121132132232231111333111,190009001808001700100006000012000005001500070006220000200000001100002100000015270018070000051100000600001814000000000000000000190009002511000014000000000000000000

The solution is straightforward when one notes the hidden pair 1,4 in 5hj and 5fg which leads to a hidden pair 8,9 in 5abc and 6b. I think think this observation would be a result of what I think of as cage comparison.

## ... by: JohnNoneDoe

I am looking forward to the cage comparison documentation. I assume it covers such things as 5 in 2 and 6 in 2 in the same unit, seems very powerful.

## ... by: Thinkist

If I'm understanding correctly, this strategy is the exact same as Killer Combinations (hard).

Also, the X-Wing strategies and those below it are useless (or at least really rare). Same for KenKen and KenDoku.

Article created on 7-August-2011. Views: 15177