https://www.doom2.net/doom2/cheating.html

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               An explanation of cheating in Doom2 Deathmatch
                                       
                                       

                      First, a definition of cheating..

             

               Any modification not normally available in Doom2 that
            provides an advantage to one player over another with
            regard to:

            (1) humanly-executable player movement,
            (2) visual abilities,
            (3) audio abilities,
            (4) player aim abilities, or
            (5) mechanisms to locate the opponent,

            and furthermore, these changes are put into effect in a
            game against another player who either

            (1) does not agree to, or
            (2) is unaware that the change has been implemented

            is cheating.

            Modifactions to sound and graphics to help a hearing or
            visually impaired player compensate for his or her
            disability are not considered cheats.


                This page has been written to provide a means by
        which we honest players can keep our  netparties, modem
        games,  - and most importantly our tournaments -, free from
        the effects of those who would choose to cheat in Doom2. It
        relates primarily to the classic, DOSmode Doom2.exe; the
        usefulness of these cheats on the various Doom ports has not
        been examined (other kinds of cheats are reported to exist
        for these Doom ports, but we are not exploring them here).

                  There is a dilemma with writing an explanation of
        cheating, and that is that the few people who would like to
        cheat may attempt to use such explanation as a means to learn
        or invent cheating mechanisms for their own use. After much
        thought and observation of recent events, I have come to
        believe that this problem is outweighed by the impact that
        some of these cheats can have on tournaments, especially ones
        where prizes with cash value are awarded to the winners.
        Should any one of these cheats be used in a LAN tournament,
        this use is detectable and proveable, with no question as to
        the validity of the determination, as long as the matches are
        recorded. When the information on how to easily detect and
        prove the use of these cheats is made widespread, the few
        people who would take this information and use it to cheat
        will be only be able to participate in non-recorded,
        non-tournament, basically frivolous gameplay. This
        information will also empower us to recognize those among us,
        past and present, who are true "Doom Gods".

                  This page includes explanations of several cheat
        methods, downloads of utilities that can be used to analyze
        .lmp files (Deathmatch recordings) to decisively prove
        whether certain cheat use occured or did not occur, and
        downloadable .lmp files which may show various cheats in use.
         
         

                DOS Doom2 Deathmatch cheats with explanations
                            in order of severity
        (click on the name of the cheat to read the full explanation)


        +-----------------------------------------------------------+
        |            | Observable | Detectability |                 |
        |  Name of   | on monitor |    through    |                 |
        |   Cheat    |     or     |  analysis of  | Effectiveness** |
        |            |  speakers  |  recordings?  |                 |
        |            |  in-game?  |               |                 |
        |------------+------------+---------------+-----------------|
        |            |            |               |                 |
        |------------+------------+---------------+-----------------|
        | Doom2 1.9  |            |               |                 |
        | autoaim or |  At times  | Easy to prove | Extremely High  |
        |  "aimbot"  |            |               |                 |
        |------------+------------+---------------+-----------------|
        |    Map     |  Obvious   |   Almost no   | Extremely High  |
        |  Editing   | visibility |   evidence    |                 |
        |------------+------------+---------------+-----------------|
        |   SR-50    |     No     | Easy to prove |      High       |
        | Automation |            |               |                 |
        |------------+------------+---------------+-----------------|
        |   No-Red   |  Obvious   |   Almost no   |     Medium      |
        |            | visibility |   evidence    |                 |
        |------------+------------+---------------+-----------------|
        |   Bright   |  Obvious   |   Almost no   |     Medium      |
        |            | visibility |   evidence    |                 |
        |------------+------------+---------------+-----------------|
        |   Sprite   |  Obvious   |   Almost no   |     Medium      |
        |  editing   | visibility |   evidence    |                 |
        |------------+------------+---------------+-----------------|
        |   Sound    |  Obvious   |   Almost no   |     Medium      |
        |  Editing   |            |   evidence    |                 |
        |------------+------------+---------------+-----------------|
        |  Red Dot   |  Obvious   |      No       |   Low or None   |
        |            | visibility |               |                 |
        +-----------------------------------------------------------+
             ** Effectiveness refers to the degree to which the cheat
                                                                could
           effect the result of a match between two very high skilled
                                                             players.