1. Rh3!

1. ... c4 2. Rxh4 Bc1 (d2 etc.) 3. Rh3+ Be3 4. Rf3! e4 5. Sb7 exf 6. Sc5#

2. ... e4 3. Sb7 Bf2 4. Rh3+ Bg3 5. Rxg3+ e3 6. Sc5#

1.  ... e4 2. Ra2! a3 3. Ke1 c4 4. Sf7 c2 5. Rxa3+ c3 6. Se5#

Study in symmetry/asymmetry; double rook switchbacks on one side, single on the other; rook sacrifice; echoic mates with the knight.[A]