Burred-Ywing

*本文来自百度贴吧-辉煌背后的衰落。图片由作者重新绘制。

Ywing can be created, if we regard some interference term as burr. Sometimes we notice 2 cell with ab at first, then we create Ywing around them.

类型1 强链上毛刺 Burr on Chains

◆例 Example

将F4(2)视为毛刺。Regard F4(2) as Burr.

① F4(2)假，Ywing删除A5的3。

F4(2) is false, Ywing delete 3 from A5.

② F4(2)真，F4(2) is true.

F4(2)--F4(1)==F8(1)--I8(1)==I8(3)--[I4,I5](3)==G5(3)→A5≠3.

③ So A5≠3. 

◆例 Example

将A3(8)视为毛刺。Regard A3(8) as Burr.

A3(8)==A3(3)--A6(3)==D6(3)--D6(2)==D5(2)--D5(5)==D2(5)→D2≠5.

类型2 两端的毛刺 Burr on ends

◆例 Example

将I8(4)视为毛刺。Regard I8(4) as Burr.

① I8≠4，构成以19为首尾的Ywing。Ywing are formed with 19 as end.

② I8=4，I4和I6不是9。I4 and I6 cannot be 9.