Changes

<ref>The Finnish Immortal? The curious case of the Kasanen finish - by [https://www.facebook.com/ZibbitVideos Zibbit], [https://en.wikipedia.org/wiki/YouTube YouTube] Video<br/>{{#evu:https://www.youtube.com/watch?v=nGuTN8my-CU|alignment=left|valignment=top}}</ref>. Black, already two pieces down, further sacrifices the queen and a rook to deliver that beautiful finish. Of course, this mate in four is easy to spot for programs:

kr1r4/7p/2bqp1p1/p7/1Pp1PP1P/K1B1nNPB/PP5R/RN2Q3 b - - 0 1