In Row1, R1C2 has the possibilities of 5,9 and also R1C8 has the possibility of 5 and 9 again. Hence irrespective of where the 5 and 9 come in these 2 cells, they cannot occur in any cel which is a buddy to both these cells. Cell R1C9 is a buddy to R1C2 and also to R1C8 hence neither 5 nor 9 can be in R1C9. Similarly, if we look at Box 2, R2C5 and R3C5 both have possibilities of 3 and 4 so irrespective of that neither number can be in R3C6 which is a buddy to R3C5 and R2C5.
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