Dutch Defence A80 1. d4 f5 2. Nc3 Nf6 3. Bg5 d5
Unravelling Chessbase Magazine 169 sees the 3rd highlight as GM l'Ami video presentation of the Dutch Defence (ECO A80). Admittedly I'm not one to delve deeply into opening analysis, but there is simply a wealth of thematic ideas in an opening I don't really play.
White follows up with Bd3 and g2-g4. If Black replies ... fxg4 then f5 shuts off the Bishops communication to g4 after which open files are prised open by White.
Black does best to wait till White shows his hand.
Idea 3: White's Queenside pressure with preparation for c2-c4
In Granda Zuniga-l'Ami, Reykjavik 2015,it dawned on Black that White intends the regrouping of the Knight via Nc3-d1-e3.
This is then followed by b3, Rac1, Rfd1 and c4 with pressure on the Queenside.
It is noted that d6 is an ideal home for the Black Knight.
Idea 4: Provoking ... c6 should Black's Queen be on d7
An idea that White uses, should Black's Queen be developed to the thematic d7 is 7. Bb5
He would like to provoke 7. ... c6, which would make it difficult for Black to develop the b8 Knight since the Queen occupies d7 and ... Na6 would be met with Bxa6
Black does best with 7. ... Nc6 with ... a6 to put the question to the Bishop
Idea 5: Thematic ... g5 thrust to cast doubt into White's mind
Note that he has his dark squared Bishop outside of the pawn chain already.
Idea 9: Black's ... Ne4 with Queenside expansion
Idea 11: White's dark square blockade on f4 and e5
With the absence of Black's dark squared Bishop, ideal outposts are f4 and e5 for White's Knights.
Idea 12: Black's Knight defensive duties at f7
Black's Knight can regroup with Nd8-f7 followed by ... e5 to prevent any invasion by White.