Find the duplo-moves

Duplo-moves are the technique par excellence to gain wood.
There are 3 duplo-moves:

• double attack
• discovered attack
• pin/skewer

If these duplo-moves are not around (and there is no trap), you cannot gain wood.
Ask yourself these questions:

• Are there duplo-moves around?
• Are the targets in place? If not, put them in place.
• Are there defenders of the attacking square(s)? Remove the defenders.

Let's have a look at another problem of Glenn:























White to move.

• Are there duplo-moves around? Yes, B or Q d5 double attack on R and K
  
• Are the targets in place? Yes
  
• Are there defenders of the attacking square(s)? Remove the defenders. Nxc6 followed by Nxd5 undermines the d5 square

If after 1.Nxc6 bxc6 2.Nxd5 the black king moves to h8:

• Are there duplo-moves around? Yes, pin with Qa3 the black knight on d6.
  
• Are the targets in place? No, play Nxe7
  
• Are there defenders of the attacking square(s)? No.

I guess it's just a matter of doing a lot of problems, identifying the duplo-moves and creating narratives based upon them.