Doom Speed Demo Archive
https://dsdarchive.com/

Iwad:      doom2.wad
Pwad:      taschal3.wad
Map:       MAP01
Skill:     4
Category:  UV Max TAS
Exe:       XDRE v2.22 -complevel 2

Time:      0:56.94

Author:    Billa

Comments:  First off some notes about the demo itself: This is also Pacifist, none of my bullets hit the enemies, everything dies to Archvile zaps. When Kraflab released this XDRE was the only decent TASing tool and since then he has added a whole suite of bruteforcing tools to DSDA, including intercept overflow detection, so I decided it would be fairer to build this entire demo in XDRE. 

This demo took roughly 4 days but most of that was spent fruitlessly trying to replicate Zero Master's pl11 intercept overflow positioning. It's not worth it because you can bruteforce them surprisingly easily in XDRE, 5 seconds each on average - the overflow in this demo was the result of my 1st attempt to bruteforce 1 tic of movement + the pistol aiming angle, it took 10x longer to key in the input ranges than to actually execute... 

That time wasn't all wasted though because I came to realise that every overflow that uses the block repetition bug is triggered by a hitscan trace grazing the very corner of the block. I tried bruteforcing an overflow that didn't satisfy this criterion and had to stop the process after 2 hours, so that's enough evidence for me. Special thanks go to besus for sending me his "susdoom" source port, I wouldn't have been able to make this realisation without the ability to see hitscan traces & the exact block that triggers the repetition bug.

With that in mind the route is simple: get the Archvile to kill and resurrect the Zombieman 10 times (making sure at least 3 bullets land in the corner of a blockmap block), then AVJ to kill the Vile and activate the intercepts overflow in midair. Also take 1-17 damage at some point in the run so you activate the low-health exit instantly. Building this took about 2 hours in total

Video:     https://youtu.be/WkK_2gnt6K0