White to move and mate in 1

playstrategy.org/study/LSL0i5WO/xUuBOVdF

2

Black to move and mate in 1

playstrategy.org/study/LSL0i5WO/iRK3hpEq

2

Back to move and mate in 2

playstrategy.org/study/LSL0i5WO/KFeuANzv

2

White to move and mate in 2

playstrategy.org/study/LSL0i5WO/gojEKEIF

2

White to move and mate in 2

playstrategy.org/study/LSL0i5WO/zF8gMij5

21

#5
This one is very nice:

1. G@e6 Ne4+ and 2. G@f6 Qf3#

2

White to move and mate in 4

playstrategy.org/study/LSL0i5WO/NtymvavG

Well, the shortest path:

1. G @ c6/Nf7++ Ke8
2. G @ b6/Nd6+ Kd8
3. G @ d7/Nf7++ Ke8
4. G @d1/Rd8#

1