Solution to Problem # 23

This famous position is from the "Evergreen Game," Anderssen-Dufresne 1852. In this remarkable game, White wins with 20.Rxe7+. Black has three possible replies:

1. 20…Kf8 21.Re3+ followed by Rxf3
   
2. 20…Kd8 21.Rxd7+ Kxd7 (21...Kc8 22.Rd8+ Kxd8 23.Bf5+ Ke8 24.Bd7+ Kd8 25.Bxc6+ Qxd1+ 26.Qxd1+ Bd4 27.Qxd4+ Kc8 28.Qd7#) 22.Bf5+ Ke8 23.Bd7+ Kd8 24.Bxc6+ Qxd1+ 25.Qxd1+ Bd4 26.Qxd4+ Kc8 27.Qd7#
   
3. 20…Nxe7 21.Qxd7+ Kxd7 22.Bf5+ Ke8 23.Bd7+ Kf8 24.Bxe7#

Here is the entire game score:

Anderssen,Adolf - Dufresne,Jean [C52]
'Evergreen Game' 1852 Berlin
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4 7.0–0 d3 8.Qb3 Qf6 9.e5 Qg6 10.Re1 Nge7 11.Ba3 b5 12.Qxb5 Rb8 13.Qa4 Bb6 14.Nbd2 Bb7 15.Ne4 Qf5 16.Bxd3 Qh5 17.Nf6+ gxf6 18.exf6 Rg8 19.Rad1 Qxf3 20.Rxe7+ Nxe7 21.Qxd7+ Kxd7 22.Bf5+ Ke8 23.Bd7+ Kf8 24.Bxe7# 1–0