Ex8 of set4

hello, this is my first post.

I have a question on Exercise8 of set4.

The annotation has the following, but I feel uncomfortable about it:
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16.Nxc4
I am convinced that you like more this position. White improved the position of his knight (on c4), the a1-rook will get an excellent position on a1, and the black king is more exposed.
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I would rather have a rook on c1 in this position. Doesn't the above mean "the a1-rook will get an excellent position on _c1_," ?

I asked this to admin@chessmasterschool by email 1 week ago, but he/she does not respond to this question.

thanks in advance

I believe this is a typo and that he really does mean Rook on c1.

Thankyou mrhollywood95, for taking time and check the annotation.

mrhollywood95 wrote:I believe this is a typo and that he really does mean Rook on c1.

I was not sure since engines do not show me the answer directly.
It's good to be able to ask human players.

I found the game in Chessbase. Looks like the authors meant Rd1.
[Event "Zadar op"]
[Date "2004.12.13"]
[Round "1.3"]
[White "Kovacevic, Aleksandar"]
[Black "Jelecevic, Ivo"]
[Result "1-0"]
[ECO "C13"]
[WhiteElo "2556"]
[BlackElo "2156"]
[EventDate "2004.12.13"]
[EventRounds "9"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4 5. Nxe4 Be7 6. Bxf6 gxf6 7. Nf3 a6 8.
g3 f5 9. Ned2 b5 10. Bg2 Bb7 11. O-O Nd7 12. c3 c5 13. Re1 h5 14. Qe2 Qc7 15.
c4 bxc4 16. Nxc4 Rc8 17. Nfe5 Nxe5 18. dxe5 Bxg2 19. Kxg2 h4 20. Qf3 Rd8 21.
Rad1 Kf8 22. Rxd8+ Bxd8 23. Rd1 Kg7 24. Rd6 Be7 25. Rxa6 Rd8 26. Qc6 h3+ 27.
Kxh3 Rh8+ 28. Kg2 Qd8 29. Nd6 Qg8 30. Ra7 Bxd6 31. exd6 Qh7 32. h4 Qg6 33. Qxc5
Rxh4 34. Qc3+ 1-0

Thanks again mrhollywood95!

mrhollywood95 wrote:I found the game in Chessbase. Looks like the authors meant Rd1.

Hmm white's plan in the game (to 'fix' Black's isolated pawn on c5) is interesting.
I thought white would keep the pressure on c5 and prepare for timely dxc5.