Today, 2L played a counter game called ‘Nim 7’. It is a game for 2 players.
Each player takes turns to take away either one or two counters.
The player who takes the last counter wins.
2L played this for a while and then we begun to discuss strategies. Some children thought you had to go first to win. Some children thought you had to pick up the opposite amount of counters to your partner (so if they picked up 2, you would pick up 1). We tested these theories to see what worked.
George and Jacob worked out a strategy so that you can always win. “If you go first pick 1, then always get your opponent down to 3 counters”.
We realised that 3 was the magic number for winning the game! If you could get you opponent down to 3 counters, then you would always win!