3/18/2023 0 Comments New york times sudoku hard![]() ![]() R4C7 5 by DSA reduction of in C7 from DS in R4.įormation of a major breakthrough Cycle (1,5,6,9) is also shown, but this will be discussed in details next stage. ![]() R8C8 7 by DSA reduction of in C8 from DS in R8. Next valid cell is by an opportunistic scan: R1C7 1 by scan for 1 in C9 - R1C9 9 by exception in top right major square. This is a quick trick to earn a valid cell. So only cell left in R3 for 3 is R3C9 and we get the breakthrough R3C9 3. As a result, cells R3C3, R3C4 and R3C5 are prohibited for 3 by digit 3 in columns C3, C4 and C5. Parallel digit scan: Empty cells of R3 is scanned in parallel simultaneously for digit 3 appearing in the intersecting columns. The next breakthrough valid cell is R3C9 3 by parallel digit scan for 3. R2C5 3 by DSA reduction of in C5 from possible digit subset DS in R2. With no more valid cell by row column scan we'll use possible digit subset analysis or DSA technique now. ![]() R5C6 8 by row column scan for 8 in central middle major square: 8 in R4, C4, C5. Next valid cell by row column scan for 8: R3C2 8 by scan for 8 in left middle 9 cell square: 8 in R1, C1, C3 and R2C9 8 by scan for 8 in R1, R3. R2C4 4 by row column scan for 4 in top middle major square: 4 in R1, R3, C5, C6 - R9C2 4 by row column scan for 4 in bottom left major square: 4 in R7, C1 - R8C7 4 by row column scan for 4 in bottom right major square: 4 in R7, R9, C8 - R5C3 4 by row column scan for 4 in left middle 9 cell square: 4 in R4, R6, C1, C2. Step by step solution to the New York Times Sudoku Hard 23rd February, 2021: Stage 1: Breakthroughs by DSA technique and Parallel digit scanĪ good number of initial valid cells obtained by row column scan. The New York Times Sudoku Hard, 23rd February, 2021īefore going through the solution solve the puzzle first. New York Times Sudoku Hard FebruEasy Solution explains step by step how the multiple breakthroughs are achieved by advanced Sudoku techniques. New York Times Sudoku hard 23rd February, 2021 Easy Solution to a tough Sudoku ![]()
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