Code: Select all
7 6 1 8 3 2 4 9 5
4 9 8 1 6 5 2 37 37
3 5 2 4 9 7 6 1 8
9 3478* 367x 36* 48 1 378* 5 2
58 348* 356 2 7 9 1 3468 36
2 1 367x 356* 458 68 378* 34678 9
1 37* 9 567 58 68 357* 2 4
568 2 3567 57 1 4 9 3678 367
568 78 4 9 2 3 578 678 1
A. r4c7 = 3 ==> r6c4 = 3 ==> r4c3 <> 3 & r6c3 <> 3
B. r6c7 = 3 ==> r4c4 = 3 ==> r4c3 <> 3 & r6c3 <> 3
C. r7c7 = 3 ==> r7c2 <> 3 ==> 3 in r4c2 or r5c2 ==> r4c3 <> 3 & r6c3 <> 3
So we can eliminate the “3” at r4c3 & r6c3, creating the {6, 7} pair in column 3. Neat!
Here’s my question. Why is this called a "template" pattern? There’s an older name for this -- it’s called "Nishio." Observe that the logic is exactly the same, but backwards.
Code: Select all
7 6 1 8 3 2 4 9 5
4 9 8 1 6 5 2 37 37
3 5 2 4 9 7 6 1 8
9 3478 367a 36b 48 1 378* 5 2
58 348 356 2 7 9 1 3468 36
2 1 367b 356a 458 68 378* 34678 9
1 37ab 9 567 58 68 357* 2 4
568 2 3567 57 1 4 9 3678 367
568 78 4 9 2 3 578 678 1
B. r6c3 = 3 ==> r7c2 = 3 & r6c4 = 3 ==> no way to fit a "3" in column 7.
This second way of looking at it is a classic Nishio. So why are you calling this thing a "template" and not "Nishio", Ruud?