对角线变型技巧 Techniques in Diagonal

*本文内容有一部分参考了独数之道论坛的相关内容，作者叶卡琳娜。文中图片为作者重新绘制。

*在下面的所有案例中，棕色格子表示该格不含有我们的目标数字。In the next examples, the brown cells mean that they do not contain our goal numbers.

技巧1 Xwing变型

◆Skewed Xwing

例1中，数字A只能在主对角线和第九行的圆圈格内，删除红色的A。例2是这一结构的互补。

Number A can only be in circle cells in Diagonal D and Row 9 in the example 1, delete A in cells with red candidates. Example 2 is the complementariness of this structure.

这种结构有它的变型，可能会比较复杂。

Skewed Xwing has variant. It is complex.

◆Hourglass Xwing

下面例子里，Xwing的格子都在对角线上。

Xwings are all on diagonals in the next example.

这种结构也有变型，并且可以被视为Finned-Xwing。

Hourglass Xwing has variant. We can regard them as Finned-Xwing.

◆Cross Over

复杂的情况。我们可以将它们视为变型鱼。我们可以将一部分单元格视为毛刺。

Complex structions. We can regard them as Finned-Fishes. You can think some cells as burr to understand them.

练习 Practice A

① 找到不能是A的单元格 Find which cells cannot be A.

答案 Answer A

① H2, H5, E8, B8 in left; I9 in right.

技巧2 XYwing变型

◆单删XYwing

◆XYwing自成环

练习 Practice B

① 练习1中哪些格子不能是Z？

Which cell cannot be Z in practice-1?

② 练习2中，哪些白色格子不能是A？

Which white cell cannot be A in practice-2?

Practice 1 and Practice 2

答案 Answer B

① Like this. ② Other parts in Column 3, Row 8, and E5、A9.

技巧3 UR

这道例题是2016年GP第六轮（日本轮）的比赛题。3和6的致命模式需要被避免，所以3和6应当在G4和H6，G4=6，H6=3。这一方法可以避免链技巧的使用。

This example comes from GP 2016 R6 Japan. Deadly Pattern of 36 should be aviod. So 36 should be in G4 and H6, G4=6, H6=3. This way can bypass the chains.