Checkmate puzzles for advanced players

Checkmate in 11

1.S1d+ 2.Kx1d 3.P1e 4.K1c 5.P1d 6.Kx1d 7.+R2e 8.K1c 9.P*1d 10.K1b 11.+R2a

1.N*1d 2.K1b 3.B*2a 4.Kx2a 5.G3a 6.Kx3a 7.S*2b 8.K4a 9.S5a+ 10.K4b 11.+S5b 12.K4c 13.L5c+

1.B3a+ 2.Kx3a 3.S*4b 4.K2b 5.Sx3c+ 6.K1c 7.+Sx2c 8.Kx2c 9.P*2d 10.Kx2d 11.+B3d 12.K1e 13.G*1f

1.S*2b 2.K1b 3.G2c 4.Kx2c 5.B3c+ 6.K1b 7.S1a+ 8.K1c 9.P1d 10.Kx1d 11.+B2d

1.B3a+ 2.Kx3a 3.N4b+ 4.K2a 5.+N3b 6.K1b 7.+Bx2c 8.Kx2c 9.G*3c 10.K1b 11.+N2b

1.B1c+ 2.Kx1c 3.B*2b 4.K1b 5.B1a+ 6.Kx1a 7.L*1c 8.Nx1c 9.G2a 10.K1b 11.G2b

1.B1b+ 2.Kx1b 3.N*2d 4.K2a 5.+R2c 6.S2b 7.N1b+ 8.K3a 9.+Rx2b 10.K4a 11.S*5b

1.N*2d 2.Px2d 3.S*2c 4.K1c 5.S2b 6.K1b 7.P*1c 8.Nx1c 9.S2a 10.Kx2a 11.L*2c 12.K1b 13.L2b+

1.G1c 2.Kx1c 3.P1d 4.K1b 5.P1c+ 6.Kx1c 7.B*2d 8.K1b 9.P*1c 10.Nx1c 11.Bx1c+ 12.Kx1c 13.P*1d 14.K1b 15.N*2d

1.S*1c 2.Kx1c 3.N*2e 4.K2b 5.G*3c 6.K1b 7.S2c+ 8.Gx2c 9.P*1c 10.Gx1c 11.Nx1c+ 12.Kx1c 13.G*2c