Originally posted by THUDandBLUNDERI think it isn't possible.
Originally posted by Mephisto2OK, but it is possible in 21 plies.
How about this (not all moves are forced):
1.Na3 h5 2.Nb1 h4 3.Na3 h3 4.Nb1 Rh6 5.Na3 Rg6 6.Nb1 Rg3 7.hxg3 h2 8.Nf3 Nh6 9.Rg1 h1=R 10.Na3 Ng8 11.Nb1 Rh8 12.Rh1 Rh7 13.Ng1 Rh8
Originally posted by THUDandBLUNDER1.Nf3 h5 2.Rg1 Rh6 3.Rh1 Rg6 4.Rg1 Rg3 5.hxg3 h4 6.Nc3 h3 7.Nb1 h2 8.Nc3 h1=R 9.Nb1 Rh3 10.Rh1 Rh8 11.Ng1 is the fastest.
OK, but it is possible in 21 plies.
(Before BigDogg logs on, I realize I should have asked 'how could' rather than 'how did'.)