From the problem cellar
Dots and boxes problems
30 positions in three difficulties. A tick marks the ones you have solved in this browser.
Draw lines between dots; close a box and draw again. Control the chains.
Easy · #501–510
A small board near the end. Decide whether to take or to decline.
Medium · #511–520
A 4 × 4 board in the chain phase. Count chains before you draw anything.
Hard · #521–530
A 5 × 5 board with many chains and perhaps loops. Control is worth more than the boxes on offer.