10...d5 is a very interesting novelty in Ruy Lopez.
Here is links to games with 10...d5:
V.Kuznetsov – G.Gajewski. Game 4 on the page:
http://e3e5.com/article.php?id=1495Collection at chessgames.com:
www.chessgames.com/perl/chess.pl?node=5174466
C96b: Spanish: Closed, Chigorin, 10.Bc2
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 d5