Dice Checker

Instructions:
Each turn each player rolls 5 dice and then chooses 3 of them.
The chosen dices are added and the player checks the number.
To check means that he marks the number with his colour.
If the number is already checked he has to choose and check an unchecked number with the colour of the oponent.
If all numbers (3 to 18) are checked the game is over and the player with the most numbers checked wins.