FM Perrine, How much time would you suggest spending on each position before giving up? And, am I right in assuming the move calculation should be done in our head rather than on a physical board?
I would probably not spend more than 15 minutes per position. Setting up the positions on a physical board and calculating in your mind while looking at the board is good. However, in order to get the maximum mental workout and improvement you will want to avoid moving the pieces while you're calculating until you think you have the full answer.
FM Perrine, How much time would you suggest spending on each position before giving up? And, am I right in assuming the move calculation should be done in our head rather than on a physical board?
I would probably not spend more than 15 minutes per position. Setting up the positions on a physical board and calculating in your mind while looking at the board is good. However, in order to get the maximum mental workout and improvement you will want to avoid moving the pieces while you're calculating until you think you have the full answer.