FOUR IN A ROW

Use , / < and . / > to select a column, then Space to drop. You can also click a column. The computer scans across the columns while thinking, as in the original. When facing two immediate threats it panics and moves between both positions. The starting player alternates each game.

No computer move yet.

Game engine retains the original 1–42 board positions, marker values 1 and 5, N(C) column pointers and T() move-evaluation sums. The computer cursor replays its search across the top of the board before placing a marker.