Checkmate in 13 Solution 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
