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The video presents the solution to a hard sudoku published by The New York Times on 08.02.2025.

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

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🕖 Timestamps and explanations

00:00 - 00:40
obvious numbers

00:40
the only free cells for nine in a row – regardless of which cell nine will ultimately be placed in, it cannot appear again in this row, so we exclude the remaining free cells for this number in the row

00:50 - 01:10
the intersection of a column, square, and row is the only place for two – all other numbers are already present in the column, square, and row of this cell

01:10 - 01:28
the free cell at the intersection of a square and a row is the only place for five – all other numbers are already in the square or row of this cell

01:28 - 01:40
the free cell at the intersection of a row and a column is the only free place for eight – all other numbers are already in the column and row of this cell

01:46 - 01:48
the only free cells for eight in the square are in one column – regardless of where eight will ultimately be placed, we can exclude it from the remaining free cells in this column

02:15 - 02:40
X-wing – the only free cells for four in the middle-left square and the bottom-left square are in the same two columns. Regardless of which exact cells four will be placed in within these two squares, it will always occupy these two columns. Thanks to this, we can exclude the free cells for four in these two columns in the top-left square.

02:50 - 02:52
the last free place in the row.

03:08 - 03:25
X-wing – the only free cells for five in the bottom-middle and bottom-right squares are in the same two rows. Regardless of the configuration of five in these two squares, five will not appear again in these rows in the bottom-left square.

03:28 - 03:55
The missing numbers in the bottom-right square are five, six, and eight. We find three free cells for these three numbers – regardless of their final placement, we can consider these three cells occupied by five, six, and eight. Now, three free cells remain in the square for one, two, and seven. These cells are also considered occupied by these numbers. Since we considered the two free cells at the bottom of the column intersecting this square occupied by five, six, or eight, we can be sure that the missing one in the column will not be placed in them. Now, we find the only free place for one in the column.

04:11 - 04:26
five is the only number for this cell – all other numbers are already in the column, row, and square of this cell.