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Rewan Demontay
Rewan Demontay
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It's an underpromotion problem, with promotion to a knight on d8 with check by 1.d8(N)+ to avoid checkmate by the black queen on the ensuing move on the "h" file. All ensuing blackwhite moves must be with check for the same reason. If 1..., Kc8 then 2. Ra8# is mate, so the king must go to b8 with 1..., Kb8 after which White can follow up with 2. Nc6+ Kb7 (or 2..., Kc8 3. Ra8+ Kb7 4. Rb8#) 3. Ra7+ Kc8 4. Ra8+ Kb7 5. Rb8#.

It's an underpromotion problem, with promotion to a knight on d8 with check by 1.d8(N)+ to avoid checkmate by the black queen on the ensuing move on the "h" file. All ensuing black moves must be with check for the same reason. If 1..., Kc8 then 2. Ra8# is mate, so the king must go to b8 with 1..., Kb8 after which White can follow up with 2. Nc6+ Kb7 (or 2..., Kc8 3. Ra8+ Kb7 4. Rb8#) 3. Ra7+ Kc8 4. Ra8+ Kb7 5. Rb8#.

It's an underpromotion problem, with promotion to a knight on d8 with check by 1.d8(N)+ to avoid checkmate by the black queen on the ensuing move on the "h" file. All ensuing white moves must be with check for the same reason. If 1..., Kc8 then 2. Ra8# is mate, so the king must go to b8 with 1..., Kb8 after which White can follow up with 2. Nc6+ Kb7 (or 2..., Kc8 3. Ra8+ Kb7 4. Rb8#) 3. Ra7+ Kc8 4. Ra8+ Kb7 5. Rb8#.

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CConero
CConero
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It's an underpromotion problem, with promotion to a knight on d8 with check by 1.d8(N)+ to avoid checkmate by the black queen on the ensuing move on the "h" file. All ensuing black moves must be with check for the same reason. If 1..., Kc8 then 2. Ra8# is mate, so the king must go to b8 with 1..., Kb8 after which White can follow up with 2. Nc6+ Kb7 (or 2..., Kc8 3. Ra8+ Kb7 4. Rb8#) 3. Ra7+ Kc8 4. Ra8+ Kb7 5. Rb8#.