ปีกผีเสื้อสองเส้น

ค้นหา ปีกผีเสื้อสองเส้น.

Digit 2 appears exactly twice in row 3 and exactly twice in column 1.

Row 3 and column 1 each form a conjugate pair for digit 2.

One endpoint from each pair shares box 1, forming the kite's joint.

The tails are r3c9 and r8c1. Since one tail must be 2, these cells that see both tails cannot keep 2: r8c9.

Remove 2 from the cells that see both r3c9 and r8c1: r8c9.

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