"마지막 빈 셀"은 기본적인 스도쿠 풀이 기술입니다. 스도쿠 그리드의 각 3x3 블록, 수직 열, 수팽 행에 1부터 9까지의 숫자가 들어가야 하며, 한 3x3 블록, 수직 열, 수평 행에는 각 숫자가 한 번씩만 들어가야 한다는 사실을 활용하는 아주 간단한 규칙이죠.
따라서 3x3 블록, 수직 열, 수평 행에 빈 셀이 단 하나만 남았다면 1부터 9까지의 숫자 중 어느 것이 빠졌는지 확인하고 해당 셀에 빠진 숫자를 입력하면 됩니다.
아래 예시에서 확인해봅시다.
이것이 기본적인 주요 규칙입니다. 이 기술을 숙지했다면 다음 스도쿠 전략으로 넘어갑시다.
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