After concluding his problem solving challenges on the demonstration board, Koltanowski would turn his back on the audience and examine the chalk board for three or four minutes. Then he would seat himself with his back to the board and ask for any audience member to call out a square; for example, "e4". He would recite from memory the entry in that square as an assistant crossed it off with a chalk mark. Making imaginary knight-moves through his re-entry sequence, Koltanowski would recite the contents of each square as the knight landed on it.