I think I would have gone 17...Rh6 Then depending on whites move it could be either mate in 5 moves or it might take a little longer. At least you would be up by 4 more points and white would not have a queen.

Your move of 17...Rxh2 and then white Kxh2 gives white a net gain of 4 points although it did allow you to get control of h and therefore win the game.

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