1. Kh4!

1. ... Kg1 2. Kg3 Kh1 3. Kf2 Kh2

4. Bg4 Kh1 5. Sg3+ Kh2 6. Sef1#

4. ... h5 5. Sf1+ Kh1 6. Sfg3#

1. ... Kh1 2. Kg3 Kg1 3. Sd4 Kh1 4. Se2 f5 5. Sxf5 e3 6. Bf3#

3. ... f5 4. Se2+ Kh1 5. Sxf5 e3 6. Bf3#

Following an initial " dance" of the kings to get the black king in his place, either the knights (in an echoic fashion) mate or the white bishop.[A]