Jan Rusinek
Jan Rusinek (born 2 December 1950) is a Polish mathematician and chess problem, chess composer, particularly noted for his brilliant endgame studies. He was editor of the study section of ''Szachy'' (Chess) from 1971 to the magazine's closure in 1990. Rusinek became an International Judge of Chess Composition, International Judge of chess composition in 1983, and a List of grandmasters for chess composition, Grandmaster of chess composition in 1992. He won over 30 first prizes in composing tourneys. The ''Oxford Companion to Chess'' opines that "his achievements are likely to rival those of his greatest predecessors". Endgame studies To the left is one of Rusinek's better known studies. Black threatens Nb5-d6# or Ne4-d6# and 1.Kb7 Bd5+ does not help, so 1.a7 is necessary. Now 1...Bd5 can be answered with, among other lines, 2.g8Q Bxg8 3.a8Q Nxb6+ 4.Kb7 Nxa8 5.Kxa8 Be6 6.Kb8 and Black must give up a piece for the c pawn, so instead 1...Ba6+ 2.b7. Now 2...Nb5 threatens 3...Nd6# bu ...
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