After 9. Ce1 d5 10. Ae3, I searched Big Base 2017 and in the past years there is Martinsen-Dahl, Stavanger 2017 where Black played 10...Af6 11. Tc1 Af6 and later a ...b5?!?! but looks to me stragetically bad. Ended up losing.

Other 2017 game is Mihaljov-Stefansson, Stockholm 2017 (is the Classical Dutch popular in Scandinavia ¿

) also 10...Cc6 11. Tc1 Af6 12. f3 and the question what to do about the centre. 12...dxc4 looks

and 12...exf3 13. Cxf3 how to develop that queenside. Black opted to do 12...dxc4 and lost as well.

After thinking for a few minutes I did not know what to do and turned on the engine for a bit of inspiration if Black tries 12...exf3 13. Cxf3. It gave 13...a5 14. h4 Ta6 as the first line.

In both games Black were higher rated so that definitely concerns me.

There is however the game Sbarra-Castaldo, Ivrea 2005 where Black did 12...exf3 13. Cxf3 Ce7 and Black did a slav-like set-up with ...c6 and they drew shortly after. Not much indication of what would be like if they played on.

I do not like the decision to sac pawn on d5 in Sumets-Brynell, Palma 2009 where after 13...Ad7 14. cxd5 exd5 15. Db3 De7. Maybe 13...Ce7 is better.