White to move and mate in 3.
NB: I’ll hold comments with solutions ’till the next day so there won’t be “spoilers” for others.
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…Nc4 wandering off is not a good move. So attack
1. Rg7+ Kh8
2. Rg8+ forcing RxR
3. Nf8#
Thank you for that superb statuary group of the Baptism by Francesco Mochi at the Basilica of San Giovanni dei Fiorentini, which took a bit of chasing around through various-language Wikipediae to learn more about! The French article on the Church tantalizingly says “En 2017 Le Baptême du Christ, de Francesco Mochi, de 1634, est placé dans une alcôve latérale de la nef, près de 4 siècles après avoir été commandée et réalisée.”
R to G7+
K to H8
R to G8+
R to G8
N to F7#