rod03801: He had two pieces to choose from. Knight at C9 and Knight at J6. If he clicked the C9 Knight, BK would automatically move the Knight to C11 and remove the black Knight at C10. But Ceiter chose to move the J6 Knight. BK recognized that because of the position of the C9 Knight, it is mandatory for the J6 Knight to make a knight's charge and automatically moved the J6 Knight to H10. From there, Ceiter could choose the path, going either h10xj12xl12 or h10xf12.