Puzzle #6

Solution: drop in column 6

Counting columns from the left and rows from the bottom, red plays column 6. That single drop creates two winning squares at once: column 3 on row 2, and column 7 on row 2.

• If blue blocks column 3, red wins in column 7.
• If blue blocks column 7, red wins in column 3.
• 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.