"Х-윙"은 평행한 두 행 또는 열을 활용하는 고급 스도쿠 기술입니다. 이 전략을 활용할 때 3x3은 신경 쓰지 않아도 됩니다.
예시를 보면 이 기술을 이해하기가 한층 쉬울 겁니다.
여기 두 행을 봅시다. 각 행에는 메모에 4가 있는 셀이 두 개씩 있습니다. 같은 행이나 열에 4가 반복될 수는 없으니, 여기서는 하늘색 셀이나 파란색 셀에 대각선 방향으로 4가 들어갈 것이라고 확신할 수 있죠.
그럼 줌아웃하여 해당 열을 확인해봅시다. 4가 대각선을 이루니, 이 열에는 이미 4가 하나씩 들어갈 것입니다. 따라서 다른 곳에 다시 사용할 수 없죠.
따라서 이 두 열의 나머지 메모에서 4를 확실하게 없앨 수 있습니다.
이제 스도쿠에서 X-윙 기술을 사용하는 방법을 알았으니 다음 고급 스도쿠 기술은 "Y-윙"으로 넘어갈 수 있습니다.
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