You must activate JavaScript to enhance chess diagram visualization. a7 b8 d8 Where to place the black king for it to be checkmate? 16/20 Checkmate Sider: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37