#lookahead

Question 1: Single choice

A Connect Four agent plays a winning move whenever it has one. Otherwise it blocks any column where the opponent could win on its next move, and otherwise it plays a random valid move. It checks horizontal, vertical and diagonal lines. In which situation can it still lose?

The opponent has two winning columns at once; only one can be blocked1
The opponent's winning line is diagonal and runs downward from left to right2
The agent can win this turn, but the opponent also threatens to win next turn3
The opponent has three discs stacked in one column with room above them4

Timed test