1. Qe7+.
A- 1……Kh6. 2. Qh4+. Kg7. 3. Qd4+. Kh6. 4. Qf4+. Kg7. 5. Qe5+. Kh6. 6. Rh4+!. gxh4. 7. Qf6#! Main variation.
B-1…..Kg8. 2. Qe6+.
B1- 2…….Kh8. 3. Qe5+. Kg8. 4. Qxb8+. Kg7. 5. Qf8#
B2- 2…….Kg7. 3. Qe5+. ( if 3….Kg8. 4. Qxb8+ and 5. Qf8# as in B1 above) Kh6. 6. Rh4+. gxh4. 7. Qf6# as in A above.
If Black King retreats to eighth rank, he gets mated with Qf8# and if he advances to h6 he gets mated by Qf6#, a beautiful epaulette mate!
In variation A if Black plays differently at move 3
1. Qe7+. Kh6. 2. Qh4+. Kg7. 3. Qd4+. Kg8. 4. Qd5+. Kg7/h8. 5. Qe5# transposes back into main solution.
So all variation transpose into above solution.
1. Qe7+.
A- 1……Kh6. 2. Qh4+. Kg7. 3. Qd4+. Kh6. 4. Qf4+. Kg7. 5. Qe5+. Kh6. 6. Rh4+!. gxh4. 7. Qf6#! Main variation.
B-1…..Kg8. 2. Qe6+.
B1- 2…….Kh8. 3. Qe5+. Kg8. 4. Qxb8+. Kg7. 5. Qf8#
B2- 2…….Kg7. 3. Qe5+. ( if 3….Kg8. 4. Qxb8+ and 5. Qf8# as in B1 above) Kh6. 6. Rh4+. gxh4. 7. Qf6# as in A above.
If Black King retreats to eighth rank, he gets mated with Qf8# and if he advances to h6 he gets mated by Qf6#, a beautiful epaulette mate!
In variation A if Black plays differently at move 3
1. Qe7+. Kh6. 2. Qh4+. Kg7. 3. Qd4+. Kg8. 4. Qd5+. Kg7/h8. 5. Qe5# transposes back into main solution.
So all variation transpose into above solution.
1. Qf6+ transposes into Harry’s lines, apart from the fastest losing one so it’s less good than 1. Qe7+ allowing for imperfect play.