I caclulated the sum of perft on the pgn of the 8 edition of wbec
see history page of
http://wbec-ridderkerk.nl/
and download 4783 games of the 8th edition
I calcularte perft of every position that was done a move from it in the wbec games and calculated the sum of the values
My result based on epd file that was generated by the crazybishop based on the pgn file:
1)sum perft 1=17547457
2)sum perft 2=542275411
3)sum perft 3=18131505044
all the 3 numbers were verified directly based on analyzing the pgn file
instead of analyzing the fens.
Uri