a)

1.Rxf1 Bh4+ 2.Kf4 Rxf1# (MM)

1.Rxh1 Bf4+ 2.Kh4 Rxh1# (MM)

1.Rf4 Rfxg1 2.Rf5 Bxe5#

b)

1.R4g3 Bxf6+ 2.Kg4 Rh4#

1.Rh4 Rhxg1+ 2.Kh5 Rf5#

1.Kg6 Bh8 2.Rg5 Rxf6#

Cross (bR), Zilahi (passive, RR, 2) × 2, Compass theme (South, 2-2, 4), JT Onkoud 50 theme (multiple), Sacrificial clearance (B-W) × 2, Active sacrifice (black, delayed) × 2, Reciprocal capture (bR/wR) × 2, Place exchange in the final positions (bicolor, Bk), Play on the same square (W1, 2), Model mate × 2, Battery mate/