a)
1.Dg1-e1 Kf8-f7 2.De1-e5 Kf7-f8 3.De5-e6 Kf8-g7 4.De6-e8 Kg7-f6 5.De8-d7 Kf6-e5 6.Dd7-c6 Ke5-f5 7.Dc6-d6 Kf5-g5 8.Dd6-e6 Kg5-h5 9.De6-f6 Kh5-g4 10.Df6-g6#
. . . . . .
5... Kf6-g6 6.Dd7-e7 Kg6-f5 7.De7-d6 Kf5-g5 8.Dd6-e6 Kg5-h5 9.De6-f6 Kh5-g4 10.Df6-g6#
. . . . . .
6... Kg6-h6 7.De7-f7 Kh6-g5 8.Df7-e6 Kg5-h5 9.De6-f6 Kh5-g4 10.Df6-g6#
. . . . .
4... Kg7-h7 5.De8-f8 Kh7-g6 6.Df8-e7 Kg6-f5 7.De7-d6 Kf5-g5 8.Dd6-e6 Kg5-h5 9.De6-f6 Kh5-g4 10.Df6-g6#
. . . . . .
6... Kg6-h6 7.De7-f7 Kh6-g5 8.Df7-e6 Kg5-h5 9.De6-f6 Kh5-g4 10.Df6-g6#
. . . . .
1... Kf8-g8 2.De1-e7 Kg8-h8 3.De7-d8 Kh8-g7 4.Dd8-e8 Kg7-f6 5.De8-d7 Kf6-e5 6.Dd7-c6 Ke5-f5 7.Dc6-d6 Kf5-g5 8.Dd6-e6 Kg5-h5 9.De6-f6 Kh5-g4 10.Df6-g6#
. . . . . .
5... Kf6-g6 6.Dd7-e7 Kg6-f5 7.De7-d6 Kf5-g5 8.Dd6-e6 Kg5-h5 9.De6-f6 Kh5-g4 10.Df6-g6#
. . . . . .
6... Kg6-h6 7.De7-f7 Kh6-g5 8.Df7-e6 Kg5-h5 9.De6-f6 Kh5-g4 10.Df6-g6#
. . . . .
4... Kg7-h7 5.De8-f8 Kh7-g6 6.Df8-e7 Kg6-f5 7.De7-d6 Kf5-g5 8.Dd6-e6 Kg5-h5 9.De6-f6 Kh5-g4 10.Df6-g6#
. . . . . .
6... Kg6-h6 7.De7-f7 Kh6-g5 8.Df7-e6 Kg5-h5 9.De6-f6 Kh5-g4 10.Df6-g6#
Without any duals.
b)
1.Dg1-g7 Ke6-d6 2.Dg7-b7 Kd6-c5 3.Db7-a6 Kc5-d5 4.Da6-b6 Kd5-c4 5.Db6-d6 Kc4-b5 6.Dd6-c7 Kb5-a6 7.Dc7-b8 Ka6-a5 8.Db8-b7 Ka5-a4 9.Db7-b6 Ka4-a3 10.Db6-a5#
6... Kb5-b4 7.Dc7-c6 Kb4-a5 8.Dc6-b7 Ka3-a4 9.Dc5-b6 Ka4-a3 10.Db6-a5#
2... Kd6-e6 3.Db7-c7 Ke6-d5 4.Dc7-b6 Kd5-c4 5.Db6-d6 Kc4-b5
6.Dd6-c7 Kb5-a6 7.Dc7-b8 Ka6-a5 8.Db8-b7 Ka5-a4 9.Db7-b6 Ka4-a3 10.Db6-a5#
6... Kb5-b4 7.Dc7-c6 Kb4-a5 8.Dc6-b7 Ka5-a4 9.Db7-b6 Ka4-a3 10.Db6-a5#
Without any duals.
If Black plays bad, there exist duals, e. g. 1… Kd5 2.Df6/Dh6, or 7… Ka3 8.Dd6+/Dc5+/Db7
