These sheets were created by Greg Reid of Queen Anne High School, Dunfermline, Scotland. He created them for his own pupils, but has generously allowed them to be made available for general use.
They are all in Microsoft Word format, as .DOC files. Each sheet (apart from sheet 1) includes the answers to the previous sheet (apart from problem 10).
Note the answer on sheet 2 for problem 1 is incorrect. The scores are black 18+2 or 18-6 and white 25+6 or 25-2, so white wins by 11 and not as stated.