I think it is an important position, and I think it should be possible to see the solution at once. Maybe I can devise a rule or two during the process of learning how to see the solution.
|White to move|
The last move of black was 1. .. Ng4. The black knight is hanging. The problem is, that if white takes it, the white queen becomes overworked. If white wants to stay ahead, he needs an extra tempo. Where does this extra tempo come from? After 1. ... Ng4 2.Bxg4 Bxg4 the white queen is hanging. If the queen takes on g4, black will get his piece back by capturing the knight on d4. White can gain a tempo by 3.Nxc6 in stead of 3.Qxg4. This power move accomplishes the following:
- White gets rid of his problem piece
- It captures a piece
- The black queen is under attack
Rule: choose the capture that poses a new threat
This might give you the impression that you can change the move order. Why doesn't that work?
1. ... Ng4 2. Nxc6 is answered by blacks power move 2. ... Nxe3
Now it is black who abides the two rules above:
- He gets rid of his problem piece
- He captures a piece
- He threatens the white queen
Rule: capture the piece of your opponent that can capture a piece of you with tempo first
If black takes the knight first 1. ... Ng4 2.Bxg4 Nxd4 then the rule "use your problem piece to capture" applies. 3.Bxc8 gets rid of your problem piece.