The above circle is a lake. Point G is a girl in a boat. Point B is a brute who wants to catch her. The brute can only run along the shoreline, while the girl can float with her boat all over the lake. While the girl goes through a distance of a radius, the brute may cover a semi-circumference. Once she reaches a point on the shore before the brute, she must be considered to have escaped (she runs more quickly than him on land). Find out how the girl escapes.
- from Dynamic Chess Strategy, Mihai Suba, Pergamon 1991.
As it happens, Mihai Suba was in town last weekend, third on tiebreak while sharing the top score in a fifteen-minute tournament in Huesca. Your correspondent was there, purely as a spectator, sharing as I do Botvinnik's dislike of rapidplay chess: partly for reasons of health and partly because my results in that discipline resemble those achieved by Fort William.
Anyway, I didn't know Mr Suba was going to be there and if I had, I might have brought along my copy of Dynamic Chess Strategy and asked him what the solution to the puzzle was, seeing as I've never been able to work it out. Never mind: I shall ask our readers instead. Perhaps they can also tell me what the Xs on the diagram are all about, which go entirely unmentioned in Suba's text. I never even noticed that before this week. Perhaps that goes some way to explaining why I never solved it.