Because:

The first one takes 1, the last one must take 1, and the last one loses;

If there are two identical piles (two or more), the one that gets first is the loser;

Because:

If the first picker picks from one pile and leaves two or more, the second picker picks from another pile with the same number of roots as the first picker; In other words, the number of remaining roots in the two piles is still the same, and the number of roots in each pile is still more than 2;

If the first one takes all the piles, the second one takes the remaining piles, leaving 1, and the first one loses;

If the first one takes 1 from a heap, the second one takes all other heaps, leaving 1, and the first one loses;

If there are three piles, namely 1, 2, 3, the first one to take is the loser;

Suppose the first pile 7, the second pile 5 and the third pile 3;

The main points of taking are:

No matter who takes it first, who takes it later;

First, if you take three piles, the number of three piles must be different, and no two piles can be less than three piles, otherwise you will lose;

Second, there are two piles left after taking it, so the number of the two piles must be the same, and it must be more than two piles, otherwise it will lose;

Suppose:

The 1 root from the first heap, 1 root from the second heap and 1 root from the third heap are three in the first order;

The second root from the first pile and the second root from the third pile are two in the second order;

Players of the game take turns to take the first order, then the second order, in no particular order, the first one wins; If the first person doesn't take it according to this method, he loses, and if the last person doesn't take it according to this method, he speeds up the pace of losing.

Like how to play the game.

The first taker can take 1 from the first pile, the second pile or the third pile if he takes1from the third pile;

The latter taker can take 1 from the first pile or the second pile if he takes1from the second pile;

The first one can only get1from the first heap; The latecomers can take 1 from the first pile or the third pile, if they take1from the first pile;

The first one can only be taken from the third heap1;

At this time, there are 5 left in the first pile, 4 left in the second pile and1left in the third pile;

If the latter takes one from the third pile, there are two different piles left, and the latter loses;

If the latecomers take from the first pile or the second pile, in order to make the three piles different, there must be two piles of three or less, and the latecomers lose;

The person who takes it first does not take it this way.

If, first take 2 from the third pile, and then take 3 from the first pile;

At this time, there are 4 left in the first pile, 5 left in the second pile and1left in the third pile;

If the first person takes one from the third pile and there are two different piles left, the first person loses;

If the first person takes from the first pile or the second pile, in order to make the three piles different, there must be two piles of three or less, and the first person loses;

People who took it later did not take it this way.

The first one takes1from the third heap;

The latter takes1from the third heap;

The first one takes three from the first pile;

At this time, there are 4 left in the first pile, 5 left in the second pile and1left in the third pile; Those who take it later lose;

According to the above method, other information not accepted by the receiver is omitted.