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The Novotny theme is named after him - the first appearance of the theme was in a Novotný"s three mover from 1854. Solution:
1.Rf5! threatens 2.Rf4 mate. If 1.. Bxf5 then 2.Nf7 threatens both mate with either 3.Nd6# and N7g5# which can"t be stopped.
1..Rf8 2.Bf6! Blocks both f8-f4 and g7-e5 lines and threats 3.Rf4# and 3.Re5#
2..Rxf6 3.Re5#, 2..Bxf6 3.Rf4#, 2..Bxf5 3.Ng5# or 3.Nd2#.