1. Kd3? Kc1 2. Se2+ Kb1 3. S4c3+ Kb2/Ka1 4. Sd1(+) Kxa2,Ka1? 5. Kc2! leading to the shorter #8

4. ... Kb1! 5. Kc3 Ka1,Kxa2 6. Kc2 etc.

2. ... Kb2!

1. Kb3! Kc1 2. Se2+ Kb1 3. S4c3+ Ka1 4. Sd1 Kb1 5. Kc3 Ka1 6. Kc2 Kxa2 7. Sd4 Ka1 8. Sb3+ Ka2 9. Sc3#

5. ... Kxa2 6. Kc2 Ka1 7. Sd4 Ka2! 8. Sc3+ Ka1 9. Sb3#

Keywords: White correction, square vacation, switchback (KSSk,KSSk), selfblock, remote selfblock, sacrifice of white piece, passive sacrifice, corner mate