Great! You have already understood how to move the board head using the operation Move and the directions (South, West, etc). Let's go a step further: the stones.

In any cell of our board we can drop stones. They have different colors:

• Red
• Blue
• Black
• And Green

For example, this is a board with a red stone and a black stone:

GBB/1.0 size 2 2 cell 1 0 Rojo 1 cell 1 1 Negro 1 head 1 1

Apart from moving, the head also can drop stones in the current cell. For that, we have the operation Drop, which orders the head to insert a stone of the given color.

program {
  Drop(Red)    
}

Try this program! Write the code in the editor, submit it and you will see what happens when executing it on this board:

GBB/1.0 size 3 3 head 0 0