Blue took the empty center cell (1,1), making it value 1. But immediately (1,1) switches from blue to red (value 2). So the masked grid: column 0 stays all blue [1,1,1], column 2 stays all red [2,2,2]. Row 0 col 1 = blue, row 2 col 1 = blue, row 1 col 1 = red. Grid row 1 is [1,2,2].