As amazing as this performance was, if time permitted afterward, Koltanowski would occasionally demonstrate his mental grasp of the board by reciting the information contained in the squares by rank or file, or even the two long diagonals. He occasionally performed the tour on two boards simultaneously. In Palo Alto, California, he conducted his performance on three chalk boards, jumping the knight back and forth between boards mid-move, until all 192 squares were completed. He made two errors and immediately corrected himself both times. At the time of this performance, Koltanowski was 80 years old.