PG in 22.0 (Heinonen)

Unto Heinonen is one of my favorite composers of proof games. The following problem is a good demonstration of his skill.


Proof Game in 22.0 moves
(position after Black's 22nd move; give the gamescore)

1.b4 c5 2.b5 Nc6 3.bxc6 d6 4.c7 Bd7 5.c8=N e6 6.Ne7 b5 7.Ng6 hxg6 8.c3 Rh4 9.Qc2 Ra4 10.e4 b4 11.Bc4 b3 12.d3 b2 13.Nd2 b1=N 14.h4 Na3 15.Rh2 Nb5 16.Ba3 Nd4 17.0-0-0 Nf5 18.Re1 Ng3 19.Re3 Nf1 20.Rg3 g5 21.Ndf3 Nd2 22.Rg4 Nb1

Nice rundlauf by black knight; Ceriani-Frolkin promotion of white knight.

Originally posted by David113
1.b4 c5 2.b5 Nc6 3.bxc6 d6 4.c7 Bd7 5.c8=N e6 6.Ne7 b5 7.Ng6 hxg6 8.c3 Rh4 9.Qc2 Ra4 10.e4 b4 11.Bc4 b3 12.d3 b2 13.Nd2 b1=N 14.h4 Na3 15.Rh2 Nb5 16.Ba3 Nd4 17.0-0-0 Nf5 18.Re1 Ng3 19.Re3 Nf1 20.Rg3 g5 21.Ndf3 Nd2 22.Rg4 Nb1

Nice rundlauf by black knight; Ceriani-Frolkin promotion of white knight.

Yep, that's it; particularly masterful is the timing of the Black Knight on the return trip avoiding collisions with the White Rook (which rules out routes like Nb1-a3-b5-c7-d5-e3).