If a PC digs a hole (or generates a pit through some other means, eg. failing to read a spellbook), and proceeds to cover the hole with a plain blanket, instead of a covered pit trap appearing, the trap will magically transform into whatever kind of trap is "appropriate" for that square--that is, whatever trap would be produced on that square if the PC used a wand of trap creation (or a trap was generated natively on that square).
Given that making a covered pit isn't really all that useful anyway, this isn't exactly a high priority issue...
I personally dislike this change a lot, but I guess I will reserve judgement until evaluating it in p8.
Also, I always thought it was pretty neat that you could create any trap by covering a pit---and lord knows, the chances of you being able to use this trick were really extremely rare, so I don't know why that needed to be changed, per se.
People have been creating all sorts of traps with blankets and pits left and right, SirTheta. It definitely wasn't intentional. Now all you get is pit traps, as would be expected.
The end of the fixed trap pattern makes me kind of giddy - especially if it results in random trap setups in the pyramid or the dwarven graveyard. I've been evading traps by heart for years, and always knew exactly where to look for convenient teleports.
They really haven't, Silfir. A wand of trap creation is like 100x more likely than an expendable blanket, and it's rechargeable to boot. It's really not that common a tactic, from what I see [and what I use]. I also don't see why this wouldn't be 'expected'; ADOM is a rather magical place after all.
Oh c'mon, there's no 'logic' behind half the things in ADOM! It made perfect sense to me ('immersion-killing'?!). ADOM's a pretty magical place (I mean, just look at what some of these wands can do), why couldn't the natural magic/corruption in dungeons create wildly different trap types when you used a blanket over a pit?
There's fantasy and then there's pure lack of logic. Even though there's stuff in ADOM (or any other fantasy setting) that doesn't exist in the real world, it still has to follow its own rules. (The Belgariad is a great example of magic with well-specified, consistent rules.) Pits and blankets are both mundane real-world items, and covering a pit with a blanket in real life wouldn't produce an arrow trap out of thin air. There's nothing in ADOM's pits and blankets that hints that there'd be something magical about them, so a player would expect them to behave just like in real life. Would you defend this bug if it appeared in a game in a sci-fi setting?