Печатавшееся в "Богословском Вестнике" с 1911г. (1911, декабрь, с. 823—838; 1913, май, с. 151-172; 1914, июнь, с.304-326; сентябрь, с.42-68) учёное исследование П. М....
Here from philosopher/logician/puzzlemaker Raymond Smullyan are fifty elegant, witty, and altogether unique "chess mysteries." In each problem the solver has to deduce certain events in a game's past. For example: On what square was...