Day Night

When the trial says "day", the real play says "night" and vice versa. Well worth a Babson.

Valery Gurov, Georgy Evseev &
Victor Chepizhny
Phénix, 1999
3rd Prize

white Bb6 Gg5e1f2 Kb3 Nc1f1 Pe4e2f7c7 Sh7a7 black Pf3g7b7 Ke6 Rh1 Ba1 Gh3c5
#2 (13+8)
Transmuted Kings
h3, g5, c5, e1, f2: Grasshopper
c1, f1: Nightrider
{
non thematic tries :
} 1.f7-f8=S + ? but 1...Ke6-d4 !{
} {
} 1.f7-f8=N + ? but 1...Ke6-g2 !{
} {
} 1.Sa7-c6 ? threat: 2.f7-f8=S # 2.Gg5-g8 # but 1...Ke6-d6 !{
} {
} 1.Gg5-g8 + ? but 1...Ke6-a6 !{
} {
} 1.Kb3-c4 ? threat: 2.f7-f8=S # but 1...f3*e2 !{
} {
} 1.Nf1-g3 ? threat: 2.f7-f8=N # but 1...f3*e2 !{

} {

thematic try :
} 1.Ge1-g3 ? threat: 2.f7-f8=N # {
} 1...Ke6-e7 2.c7-c8=S # {
} 1...Ke6-d6 2.c7-c8=N # {
} 1...Ke6-d7 2.f7-f8=S # {
} but 1...f3*e2 ! {

The key :
} 1.e2-e3 ! threat: 2.f7-f8=S # {
} 1...Ke6-e7 2.c7-c8=N # {
} 1...Ke6-d6 2.c7-c8=S # {
} 1...Ke6-d7 2.f7-f8=N #

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