1) *One row before the next bind-off row, work to the last st of the row. Do NOT work this st. Turn work.
2) Wyib, sl first st from left needle purlwise.
3) Pass unworked st of previous row over the slipped st. The first st is bound off. Cont to bind off desired number of sts for that row. Work to end of row. Rep from * until bind-off is complete.