How to play the Duck Game

ducks.md

How to play the duck game

This is a 2-player game.

First, we start with a line of blue rubber ducks (represented here as circles):

🔵🔵🔵🔵🔵🔵🔵

Now, in each turn, the current player can turn either one blue duck or two adjacent blue ducks red.

So, a valid move would be indexes 2 and 3 (0-indexed):

🔵🔵🔴🔴🔵🔵🔵

Then, the other player could choose index 0:

🔴🔵🔴🔴🔵🔵🔵

And so on. The last player to move loses.

Example game

Starting with 7 blue ducks:

Initial board

🔵🔵🔵🔵🔵🔵🔵

Player 1 chooses 3,4

🔵🔵🔵🔴🔴🔵🔵

Player 2 chooses 0

🔴🔵🔵🔴🔴🔵🔵

Player 1 chooses 6

🔴🔵🔵🔴🔴🔵🔴

Player 2 chooses 1,2

🔴🔴🔴🔴🔴🔵🔴

Player 1 chooses 5

🔴🔴🔴🔴🔴🔴🔴

Player 1 was the last one to move, so Player 2 wins.