a)diagram
1.CAg4 rGc8 2.CAd3 rGc2 3.rGe8 Gc1 4.Gd2 rGe2
5.CAg2 rGe4/Ge3 6.Gf4 rGh1 7.CAh5 rGh6#
1.CAg4 rGg3 2.rGc8/Gb8 rGb3 3.rGh3+ Ga3 4.rGf5 rGb5/Gb4
5.CAh1 rGd5/Gc5 + 6.Gd6 rGf3/CAe4 7.CAf7 rGf8#
b)wGc3-->a1
1.rGc6/CAb7 rGc8 2.CAe6 rGf5 3.CAd3 rGc2 4.Gd2 rGc4/Gc3
5.Gd4 rGe2 6.CAg4 rGh5 7.CAh7 rGh8#
1.CAg4 rGg6/CAg7 2.rGa6/Ga7 rGg8 3.CAd6 Ga5 4.Gd5 Ge5
5.rGe6 Gc5 6.CAe3 Gf2 7.CAb2 Ga2#