Today I spent another few hours at the same position as I showed you yesterday. I asked myself, or Rybka to be precise, what if I make this minor adjustment to the position? What if I remove this pawn? What if I take back with Nc6 in stead of Nd7 etc.?
The answers of Rybka showed me a whole lot of details which influence the evaluation of the position. It's hard to believe the amount of motifs that I missed! Now I understand why someone who does see all these details can crush me time and again. For instance I totally missed the importance of e6, which gives white extra mating possibilities under certain circumstances.
With the aid of Rybka I could find out what the bishop sac on h7 actually accomplishes. It's main effect is to prevent h6, which would shut off the white queen from h7.
With such semi-total chess blindness, it is evident where the focus of the study must be. So 4 hours of study for such "simple" positions as this is way too little, as DK already pointed out.
6 hours ago