A good Saturday morning practice semi-rapid. We both misplayed the opening (8. ..Nxd5 is not the simplest, 9... exd4? and 10. Re1?), but once I got to 11...Nc6, I was certain to have passed the critical stage. However, 12.Qxg7 seemed like a major positional and materialistic mistake by my opponent. Taking a pawn with the queen to open a line against one's own king while the queen-side pieces are still asleep can not be sound. Computer inspired materialism does not replace sound principles but only highlights the value of concrete thinking and calculation. Grabbing a pawn a tempo is not the same thing. The following attack played itself.