先手选9,应手只能是6;
先手再选5(9+5=14)应手只能是1(1+6=7);
先手只能选8。(8+5=13)。应手只能在2 (8+5+2=15)和 7 (8+7=15)中选1个,同时都不够15 (1+6+7=14)(1+6+2=9)。
先手胜
先手选9,应手只能是6;
先手再选5(9+5=14)应手只能是1(1+6=7);
先手只能选8。(8+5=13)。应手只能在2 (8+5+2=15)和 7 (8+7=15)中选1个,同时都不够15 (1+6+7=14)(1+6+2=9)。
先手胜
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