先手選9,應手隻能是6;
先手再選5(9+5=14)應手隻能是1(1+6=7);
先手隻能選8。(8+5=13)。應手隻能在2 (8+5+2=15)和 7 (8+7=15)中選1個,同時都不夠15 (1+6+7=14)(1+6+2=9)。
先手勝
先手選9,應手隻能是6;
先手再選5(9+5=14)應手隻能是1(1+6=7);
先手隻能選8。(8+5=13)。應手隻能在2 (8+5+2=15)和 7 (8+7=15)中選1個,同時都不夠15 (1+6+7=14)(1+6+2=9)。
先手勝
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