Inform 7 Notes — 10 of 35

Section - Playing Nim

Taking it stones from is an action applying to one value and one visible thing and requiring light. Understand "take [number] stone/stones/-- from [pit]" as taking it stones from.

Check taking a number (called n) stones from a pit (called p): let np be the stone count of p; if n > np, say "Your reach exceeds your grasp. Too many stones? The wrong pit? Just confused? Who can say?" instead; if n < 1, say "Clever...but also illegal. Nimrod glares mercilessly at you as you pull your hand back." instead.

Carry out taking a number (called n) stones from a pit (called p): now the stone count of p is the stone count of p - n; say "You feel [n stones] magically fade away at your touch. [The p] now contains [the stone count of p stones]."; if the table is nonempty, try Nimrod moving.

Carry out Nimrod taking a number (called n) stones from a pit (called p): now the stone count of p is the stone count of p - n; say "Nimrod deftly erases [n stones] from [the p], leaving [the stone count of p stones]."

Moving is an action applying to nothing.

Definition: A pit is nonempty if the stone count of it is greater than 0.

To decide whether the table is empty: let l be the list of nonempty pits; if the number of entries of l is 0, yes; otherwise no.

To decide whether the table is nonempty: if the table is empty, no; otherwise yes.

Report the player taking when the table is empty: say "Nimrod stares sadly at the empty pits. He hangs his head in shame. He has been defeated.[paragraph break]Congratulations, you've ruined everything.[paragraph break]You wander away satisfied."; increment the score; now the player is in the Briefing Room.

Report Nimrod moving when the table is empty: say "Nimrod's eyes flash in triumph as he completes his victory. You have lost, as he knew you would.[paragraph break]You slink away in shame."; decrement the score; now the player is in the Briefing Room.