Also, about algorithms, I walk through them a step at a time, keeping track of where things are in my memory. :) Once upon a time I could play an amateur level game of blindfold chess the same way. It never occurred to me that when Walter Browne was playing blindfold chess for money on the beach at Santa Monica before the 1976 US Open, with money and time odds 5:1, that he could actually see the board. I'm less impressed now, but was nowhere near his level anyway even if I could see the board.