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The video presents the solution to a hard sudoku published by The New York Times on 09.02.2025.

The recording is short, concise, clear, and without commentary.

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🕖 Timestamps and explanations

00:00 - 00:16
obvious numbers

00:16 - 00:32
In the right middle square, the missing numbers are two and three. We see two free cells for them. The only two free cells for two numbers mean that we can treat these cells as occupied by two and three, even though we do not yet know their exact placement.

In this way, we determine the approximate placement of two and three in the row, where we now only lack one, four, and six.

00:32 - 00:50
obvious numbers

00:50 - 01:22
X-WING. The only free cells for one in the top right and top middle squares are in the same two rows. This means that regardless of the final placement of one in these two squares, it will always occupy these two rows. This allows us to eliminate the remaining free cells for one in these two rows when analyzing the square on the left.

01:22 - 01:42
The intersection of the column, row, and square is the only place for six. All other numbers are already present in the column, row, and square of this cell.

01:42 - 02:40
obvious numbers

02:40 - 02:54
In the middle square, we see the only two free cells for seven. Seven must be in one of these two cells, and since both are in the same row, regardless of its final placement, we can eliminate seven from the remaining free cells in this row.

02:54 - 03:25
X-WING. In one of these two cells in the bottom left square, seven will definitely be placed. The only two free cells for seven in the bottom right square are in the same two rows. Regardless of the final placement of seven in these squares, we can eliminate seven from the rows marked in purple.

03:25 - 05:32
obvious numbers