Checkmate in 13 Solution 1.S*3a 2.K1c 3.S*2b 4.K1b 5.Sx1a+ 6.Kx1a 7.L*1c 8.K2a 9.L1b+ 10.Kx1b 11.R3b+ 12.K1c 13.+R2b
