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Start by playing Have You Got It?
Can you find a winning strategy?
Work backwards.
Simplify the game by choosing a smaller number of biscuits in each jar and working out a winning strategy.
Play the game against the computer and think about the computer's strategy.
Start with any number of counters in any number of piles. 2 players take it in turns to remove any number of counters from a single pile. The loser is the player who takes the last counter.