§19.5. Changing the behaviour of rules

Here is another way to abolish an already-existing rule:

The print final score rule does nothing.

The rule continues to be listed in any rulebook it would normally be listed in: but now it doesn't do anything. More usefully, we can attach a condition:

The print final score rule does nothing if the score is 0.

or:

The print final score rule does nothing unless the score is 100.

We can also substitute a rule of our own:

This is the print fancy final score rule:
    say "Oh my, you scored a mammoth [score]!"

The print fancy final score rule substitutes for the print final score rule.

and once again a condition can be applied:

The print fancy final score rule substitutes for the print final score rule when the score is greater than 100.


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