User blog comment:Bubby3/BM1 is weaker than expected./@comment-11227630-20180326102019

The problem first appear at (0,0)(1,1)(2,0)(1,1)(2,1)(3,1).

But how does (0,0)(1,1)(2,2)(3,3)...(n,n) (i.e. the main way of pair sequence) reduce to (0,0)(1,1)(2,2)(3,0)(2,1)(3,1)(4,1)?