c - Marienbad game wrong XOR -

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i working on programming puzzle, need code ai best current move win game.

the loser 1 picks last sticks.

here board : 

|   |||   |||||   |

so use xor operator on numbers number of sticks need remove give me : 1 xor 3 xor 5 xor 1 = 6

now :
1 xor 6 = 7 (since increased won't select case)
3 xor 6 = 5 (since increased won't select case)
5 xor 6 = 3 (since decreased reduce 5 3 removing 2 sticks.

the problem playing in "misere" version of game loser if 1 take last sticks , seems method perfect normal play winner 1 take last stick.

could explain me should in case.

the winning strategy isn't xor piles , remove many sticks 1 pile. instead, want choose number of sticks remove such xor of piles zero. example, if remove 2 sticks pile containing 5 sticks, remaining xor 1 xor 3 xor 3 xor 1 = 0.

hope helps!


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