Pick a position and find the best move.
Yellow to move — find the win in one.
Yellow has built up a stack. Finish it.
Empty board, Yellow to move. What's the best opening?
Yellow to move — complete the row.
Three high in column 3 — top it off.
Yellow's stack in column 5 is one short.
Finish the tower in column 6.
Yellow to move — there's a win on the bottom row.
Yellow to move. Red is threatening — what's the only move?
Yellow to move — there's a hidden win on the bottom row.
Yellow to move. Red threatens the bottom row — stop it.
Red is stacking column 5. Don't let it finish.
Red's bottom row is one move from winning.
Yellow to move — fill the gap for the win.
There's a hidden four across the bottom.
Yellow to move. Spot the bottom-row win.
Red's column 3 is about to top out — block it.
Red threatens the bottom row again. Only one save.
Tempting to build your own — but Red is winning first.
Yellow to move. The win is quieter than it looks.
Your column 6 pair is bait. Look at Red.
Yellow to move — one column finishes it.
A win is hiding on the right side of the bottom row.
Don't admire your column 1 stack — Red is one move from four.