Section D2 – h#3
b) -bRd4
a) 1.Rb4 Kd5 2.Sxd3 Kc6 3.Kc4 Bd5# (MM)
b) 1.Kb4 Kxe7 2.Kc5 Kd8 3.Kd6 Be7# (MM)
Exchange of functions (wBh1/wBf6, Mate / Passive guard)
Kozhakin theme × 2
Play on same square (B1, 2)
Model mate × 2
Mirror bK position
BK moves only
Distant self-block
Simple choice of move order (B1, enabling W1)