All possible moves for the White player are highlighted with yellow dots. The small yellow dots are the cells where the White player would put a stack of one piece because all those cells "see" only a single White piece. The large yellow dots are the cells where the White player would put a stack of two pieces because those cells "see" two White pieces.
In addition to the marked empty cells, the circled Red piece can be captured by the White player because the White player would put a stack of two pieces on that cell (it "sees" two White pieces) - it would be larger than the existing Red stack on the circled cell.
However, the White player cannot capture the Red stack of two pieces - because the White player could only put a stack of two White pieces on that cell and it wouldn't be larger than the mentioned Red stack.
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