a)diagram
1.Gc2-f5 2.Gc7-g7 3.Gd1-g4 4.nPd5-d4 5.nPd4-d3
6.nPd3-d2 7.nPd2-d1=nS 8.nSd1*f2 9.Gd8-f8 10.Ke1-f1
11.Ge4-g2 12.Ge8-b5 13.Gb5-g5 14.Kf1-g1 15.nSf2-d3
16.nSd3-b4 17.nSb4*c6 18.nSc6-e7 19.nSe7-g6 20.Gf5-h3
21.Gf7-h7 22.Gf8-h6 23.Kg1-h2 Kf3*g4 24.Gg5-g3 #
b) wKf3<-->bGf7
1.Gc2-g2 2.Gc7-c5 3.Gc5-e5 4.Gd1-g4 5.nPd5-d4
6.nPd4-d3 7.nPd3-d2 8.nPd2-d1=nB 9.nBd1-e2 10.Gd8-f8
11.Ke1*f2 12.nBe2-f1 13.Ge4-b7 14.Gb7-g7 15.Ge5-h8
16.Ge8-g8 17.nBf1-d3 18.nBd3-h7 19.Kf2-g1 20.Gf3-h5
21.Gf8-h6 22.Kg1-h2 23.Gg2-g5 Kf7*g7 24.Gg4-g6 #