== White to Move and mate in 545 moves? == 

 There are several blog entries that claim that a 7-man tablebase has a forced win in 545 moves. (the 550 number appears to be a series of forced captures leading to the tablebase position) Does anyone know of a reliable source that documents any of this? Obviously blog posts violate [WP:RS] and running the position through a chess engine with a 7-man tablebase would violate [WP:OR], but if we could find a reliable source, this could be a nice example of something that cannot be discovered without a tablebase.