Puzzle #8

Solution: drop in column 5

Counting columns from the left and rows from the bottom, red plays column 5. That single drop creates two winning squares at once: column 5 on row 4, and column 6 on row 2.

• If blue blocks column 5, red wins in column 6.
• If blue blocks column 6, red wins in column 5.
• If blue plays anywhere else, red takes either square and wins at once.

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