Gamerules, their advantages and disadvantages

Please note that all of these rules are counted to be the default. Based on how you would like to improve position, here are the game rule pros and cons for NCPs:

1. Anonymous. Overall is used rarely, because it attracts fewer beginning players and overall makes the game less interesting for beginner players. However, it provides way fairer gameplay and should be used for more serious games where one is trying to maximize balance. Anonymous also makes games generally less fun, but it adds the element of guessing who-is-who.
2. Play-4-mate. Brings a clear incentive to play very actively, and makes the gameplay unique. Usually used in two-player games, as it makes more sense with them. For four and three-player games, it destroys balance making it difficult to be accepted, yet its own rating system compensates for it.
3. Takeover. Brings an incentive to checkmate, defines a clear objective, at higher-level games adds more balance to the game, at lower levels usually hurts it. One of the underrated game rules, which can make the position interesting and commonly fix its problems.
4. Spectator chat. Prohibited by administrator team.
5. Capture the King. A fun element for the games that are not meant to be serious yet may strike balance if used in an incorrect position, and overall adds more luck to the high-level games. For teams, it overall makes gameplay slower and reduces the number of checkmates.
6. DeadWall. Can help to balance takeover, and adds a unique element to the game. Can help in the case of a game being a labyrinth with a lot of walls. Overall, does not add much but does not hurt anything.
7. KOTH. While players may be forced to co-operate to stop KOTH, this is usually a minor issue. Advantages outweigh drawbacks by a whole lot, as KOTH defines a clear objective and is in general a good element and addition to the game. It can add up strategies to the games where there are none, thus making it a standard and one of the most usable gamerules. Most commonly used in conjunction with N-Check.
8. Antichess. Changes gameplay completely, makes the game unique. Out of drawbacks, it destroys balance and notably limits how much variety there is. Yet nevertheless, if the position is designed to be antichess from the start, it can be balanced and variable (though it is very difficult to accomplish).
9. Diplomacy. Prohibited by administrator team.
10. +N checkmate. Defines a clear objective, brings point spread that may sometimes help with the balance or it can change gameplay flow by making trading the only plausible option. Overall, it has no drawbacks and is a commonly used gamerule.
11. N-Check. Defines a clear objective and sometimes changes the gameplay fully. The most commonly used gamerule, no comments.
12. OxN. If used correctly, it can serve as an incredible boost to the balance, yet there is rarely an opportunity for it to be used unless the position is specifically built to be balanced. If used incorrectly, can bring a good amount of luck while not helping with teaming.
13. Blindfold. Changes gameplay a lot, makes it more thrilling yet just destroys beginner-friendliness. Can be fixed by having royal threatened on the first move. Works best with KOTH, yet not so well with N-Check.
14. Ghostboard. Hurts beginner-friendliness, yet adds an interesting element to FFA games. Completely changes the gameplay of teams, as arrows are no longer in any influence. 
15. No En Passant. Used to solve a specific problem.
16. No Zombies. Used to solve a specific problem or to add a unique element to the game.

I read all your posts (a lot of reading) and I think all of them can be very usefull for begginers in making variants, but can help anyone.

change 8 to

8. Antichess. avoid like anthrax, MRSA, septicemic plague, or ebola. use only if you wish to summon the four horsemen of the apocalypse (Dead King Labyrinth, Crazy Queen War, Triad, and Weird And Funny Game That Looks Like The Scrambled Eggs I Cooked Last Friday) and overwhelm the 4PC world with imbalance

I hope Tails will revise Weird and Funny Game That Looks Like Scrambled Eggs I Cooked Last Week

My thoughts on anonymous are that while it does make the game fairer, it makes it much less fun. For example, while playing anonymous you can only guess who you are playing against, and therefore have barely any idea of what they are going to do. Without anonymous you can know the styles of players you have played against before. Also, chat is disabled in anonymous, so you cannot talk in the time it takes for it to be your turn. I agree with the statements above, but I usually avoid anonymous games because I find them to be less fun.

Thank you for the opinion, I noted it.