I love to play in tournaments and play custom positions. I have posted the custom positions that I have played, tested and spent a long time to create down below:
1. Ral's Trapped Queens Variant
In this custom position, there are two queens on the board, but both of them are trapped by pawns. The objectives of the position are to develop pieces, sacrifice as little as possible to free up your queen, promote the many pawns on the first 2 files and to checkmate your opponent! There are many strategies of freeing the queen, like just sacrificing a rook right away, but you need to be very careful that the other side does not capture a third or sixth rank pawn resulting in promotion, and in many games, it has been possible to sacrifice a bishop instead, which is less material to sacrifice. Also, there are a few tactics in the position that I did not find out myself until I played this position in a tournament, but I will leave you to find those out!
Tournaments in this position: https://www.chess.com/tournament/rals-trapped-queens-variant-position-made-by-ralral3333
2. Overly Ambitious
In this custom position, the entire board is blocked, and black only has 1 move to consider until white sacrifices to try and promote the pawns on the last few files. The position is already drawn at the beginning as white can draw by 50 move rule or repetition, but the fun comes when white sacrifices a knight to try and promote pawns. Although black has a queen, either side can win or it can be a draw once white sacrifices, so the question is for white: will you take the risk of losing in order to win?
Tournaments in this position: https://www.chess.com/tournament/overly-ambitious-tournament-position-made-by-ralral3333
3. Promotion Prevention
In this custom position, each king is behind a bunch of pawns that can easily promote. Each side tries to rush their pawns to promotion while using their pieces other than the pawns to try and prevent their opponent from promoting their pieces. It does take a few moves to release the pieces, behind the army of pawns, but it is well worth it, otherwise the other side can easily promote their pawns
4. Ral's Trapped King's Variant
This custom position is very similar to my first carefully thought out custom position, my trapped queens variant. In this custom position, the kings take the place of the queens in the trapped queens variant and there are knights instead of bishops. Surprisingly, although the position is very similar to the trapped queens variant one, the game is entirely different!
5. Sideways Chess
I know that there is n upside down chess variant that looks like a standard game except the pawns are one rank from promotion, so inspired by that variant, I created sideways chess!