1s change pl RH with 1st crnrs, 1st crnrs turn LH in centre & return to places giving RH to 1s who turn LH in centre to face 2nd crnrs
1s change places RH with 2nd crnrs, 2nd crnrs turn LH in centre & return to places giving RH to 1s & 1s end with a 1/2 turn LH to 2nd place own sides. End 2 1 3