The task
- To move
- Light
- Difficulty
- Hard
- Goal
- take 11 of 21 boxes
21 boxes are still unclaimed. The best line gives the side to move a margin of 1. A 5 × 5 board with many chains and perhaps loops. Control is worth more than the boxes on offer.
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 d6-e6. The main line runs: d6-e6 · e5-e6 · a1-b1 · a1-a2 · c5-c6 · c5-d5 · b6-c6 · a3-b3 · a4-b4 · a2-a3 · a6-b6 · a5-b5 · b4-c4 · c4-d4 · c3-c4 · c4-c5 · b1-c1 · b2-c2 · c2-c3 · c2-d2 · d1-d2 · d2-e2 · e2-e3 · e2-f2 · e1-f1.