Purple strand held in right hand is angled slightly to the left. Purple strand brought toward the operator with the right hand and placed between left thumb and index finger. Purple strand crosses over whit strand. By further supinating left hand, white strand slides onto left index finger to form a loop as purple strand is grasped between left index finger and thumb. Left hand rotated inward by pronation with thumb carrying purple strand through loop of white strand.
Purple strand is grasped between right thumb and index finger.
Horizontal tension applied with left hand away from and right hand toward the operator. This completes the second half hitch. The final tension on the final throw should be as nearly horizontal as possible. Wherever possible, the square knot is tied using the two-hand technique. On some occasion it will be necessary to use one hand, either the left or right, to tie a square knot.