Puzzle 28

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Here´s one of the oldest games from my database: played by Napoleon I at St Helena. He certainly was a great player, not only because of this puzzle below. We´re only 13 moves playing, but black played a really passive 13...a5. White has now got a Mate in 5. Could you do that as well?
(As always, the whole game could be watched by clicking Solution and then Move List, but try it yourself first!)

VVladV

Thx alot! Napoleon was smart, but he was dictatorial.