The task
- To move
- Dark
- Difficulty
- Easy
- Goal
- take 6 of 9 boxes
9 boxes are still unclaimed. The best line gives the side to move a margin of 3. A small board near the end. Decide whether to take or to decline.
What to look for
- Decline the last two boxes of a chain to keep control.
- Control: make your opponent open the long chains.
How the answer is checked
There is exactly one first move that forces the result; any other first move allows the defence to escape. Moves that keep the forced result are accepted later in the line, and a move that loses it is taken back with a short note.
Show the key move
The key move is a2-a3. The main line runs: a2-a3 · a2-b2 · b1-c1 · b2-c2 · c1-d1 · d1-d2 · b3-c3 · c2-c3 · c3-d3 · b3-b4 · a3-a4 · d3-d4.