线上连续 Consecutive On Line

标准数独基础上，线条上相邻两格数字连续。

Classic rules applied, additionally, numbers on line are consecutive.

◆1 and N 

某格的相邻格不是2，则该格不是1。最大数字N同理。

1 cannot be on the line if one of the next cells on the line cannot be 2. The same as the largest number N.

◆奇偶性 Parity

数字可能重复，但奇偶数交替出现。

Numbers may repeated on lines, but numbers' parity are alternating.

练习 Practice

① 六阶线上连续数独中，主对角线是一条线。A1和F6的奇偶性______（相同/相反）。

In 6x6 Consecutive on Line, diagonal D is a line. A1 and F6 have ______ parity (same or opposite).

② 线上连续数独中，线条组成了一个没有分支的环。这个环里有______（奇数/偶数）个格。

In Consecutive on Line, a line forms a loop without branches. It should contain ______ cells (odd or even).

③ 解答问号格 Find out the ？cell.

答案 Answer

① 相反 opposite ② 偶数 even ③ D2=1