Solve NYT hard Sudoku at one step. The 1st May 2024 Sudoku got itself solved automatically after the first few hard steps.
NYT Very Hard Sudoku 1st May 2024: One Step Solution
Stage 1: First few steps I wrote down, rest was easy
Double digit scan for [4,6] cycle (4,6) in C7: Naked single R5C7 8, R4C8 5.
Hidden single R4C4 3, R7C9 4.
Single digit lock on 3 in C9: Hidden single R6C3 3.
Crucial breakthrough naked single R4C6 6 followed by R4C7 4, R6C7 6, R6C6 5, R5C6 1.
Hidden single R6C5 4, naked singles R5C4 7, R5C3 5, R4C5 8, R6C1 9, R6C2 8.
Double digit scan for (1,3) in C2, R7: Cycle (1,3) in C9.
Cycle (2,7) by DS reduction in C8: naked singles R7C1 6, R7C3 8, hidden single R1C9 8.
Effective X wing on 7 in R8C2, R9C2, R8C5, R9C5: critical breakthrough hidden single R7C7 7.
Cycle (3,6) in C9.
Single digit lock on 9 in C8. Cycle (1,2,9) in top right major square.
Cycle (2,9) in bottom middle major square.
Start with R7C4 9.
Rest are easy.
Solution.
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NYT Very Hard Sudoku 1st May 2024: One Step Solution: Intermediate stage
The intermediate status of the solution for better understanding.
