Puzzle #10

Solution: drop in column 7

Counting columns from the left and rows from the bottom, red plays column 7. That creates a winning square in column 5 on row 1, with a second one directly above it on row 2.

• If blue blocks the lower square, their disc lifts red's next drop straight into the upper one. Four in a row.
• If blue plays anywhere else, red simply drops in column 5 and wins at once.

This is the double threat from our strategy guide: one move, two winning squares.