The kid — eight years old — put the chessboard back together and then asked if they could do the problem again because he wanted to try the knight sacrifice. The chess coach watched him set it up. Two weeks ago this child had not known how a knight moved. The coach asked a question, watched him think about it, watched him find the answer, and found himself not quite able to respond right away. Something had opened up in the kid and it was opening faster than anybody was ready for. The coach said "yes, let's do that one" in a neutral voice, but his hands were doing a small involuntary thing.