Feature request - please, add "Probabilistic chess" game

Probabilistic Chess

Vladimir Mochalov
email: sensorlife@mail.ru
publication date: 08.06.2019
initial publication in Web: https://www.researchgate.net/publication/333661338_Veroatnostnye_sahmaty

It is proposed a game designed to add uncertainty to the game "Chess", to reduce the difference in class between strong and weak players, as well as significantly reduce dependence on computer analysis and memorization of opening debuts. All this may allow to make the game spectacular, and even to a novice at any moment of the game, to give at least small chances of winning.
The game is based on the rules of the game "Chess", but the following changes are made to it:

1. The goal of the game is not to checkmate the enemy king, but to eat the enemy king (perform a successful take). The winner is the one who first ate the enemy king.
2. Taking a figure. Unlike classical chess, the capture of a figure is not performed automatically, but actions with certain probabilities are performed. In this case, there are three options for events:
   a) with probability Pa, the attacking piece successfully captures an enemy piece. This enemy piece is removed from the board and the attacking piece takes place according to the rules of classical chess (that is, for all cases except taking a pawn on the aisle, the attacking piece takes the place of the successfully taken enemy piece);
   b) with probability Pb, the attacking piece unsuccessfully takes the enemy piece. In this case, the attacking and enemy figures remain in their former places;
   c) with probability Pc, the attacking figure fails in an attempt to take an enemy figure and dies itself. In this case, the attacking figure is removed from the board, while the enemy figure remains in its place.

It should be noted that Pa + Pb + Pc = 1. You can come up with various options for calculating the probabilities Pa, Pb and Pc (including based on the weights of the attacking and attacked figure) and each option will form its own specific game.
The basic probabilistic chess will be called the following rules for considering probabilities:

• for all pieces except the king, Pa = 0.6, Pb = 0.2 and Pc = 0.2;
• for the king Pa = 0.8, Pb = 0.1 and Pc = 0.1.
  The selection of a specific event that occurred during the taking of a figure must be made with the participation of both players.
  Consider as an example one of the options for calculating an event for basic probabilistic chess. Each player secretly from the other player writes on paper a number in the interval [0, 9]. After that, the players simultaneously show their recorded numbers and their sum modulo 10 will give the number X, which will be used to select the specific event that occurred during the capture of the figure. So, for all pieces except the king, the following calculation rules are followed:
• if the number X is in the interval [0, 5], then the attacking figure successfully performs the capture of the enemy figure,
• if the number X is in the interval [6, 7], then the attacking figure unsuccessfully takes the enemy figure,
• if the number X is in the interval [8, 9], then the attacking figure fails in an attempt to take an enemy figure and dies itself.
  For a king, the following calculation rules are followed:
• if the number X is in the interval [0, 7], then the king successfully performs the capture of an enemy figure,
• if the number X is 8, then the king fails to take an enemy piece,
• if the number X is 9, then the king fails in an attempt to take an enemy figure and dies himself.

3. The king can also walk on the field, which is under attack by enemy figures, and also remain under attack by enemy figures in the next turn.

4. From paragraph 3 it follows that the king can attack the enemy king, as well as try to carry out his capture. Attempting to attack an enemy king with your king is fraught with the risk that the enemy king might try to take the first attacking king in response.

5. Castling is allowed through the broken field and on the field that is under attack by enemy figures.

6. Any piece can attack and later try to carry out the capture of an enemy king.

7. Anyone other than the king who, on the current turn, mated the enemy king, has the right to immediately (without waiting for the next move) try to capture the enemy king. If there are several such figures, then only one of them can immediately choose to capture the enemy king.

8. If at the time of the next move your king is under attack, then it is possible either to execute a move with any piece, taking into account paragraph 3, or within one move, choose no more than two pieces, each of which may try to take any of its enemy figures directly attacking the king. If two figures are chosen, it is important to indicate the sequence in which they perform their attempts.

Rules 7 and 8 are both really dumb, and pointless. It would be better without them. Other than that, it looks like a somewhat interesting variant. Obviously taking stuff with the queen would be a lot less common, if there is a 20% chance that you lose the queen. Most times it would not be worth it to take a "free" pawn with a queen at those odds. Also, people would tend to get upset a lot with it in an online game, and get mad at the computer for picking a random number that hurts them.

Rules 7 and 8 aren't pointless, you can call them dumb or uninteresting if you want, but they certainly aren't pointless. @ProgrammerAngrim

The existing variants are played very little, you would have to make a larger use case scenario to justify any variants. More variants / more features , are just added complexity for maintenance on the site.

I am a computer programmer. Maybe I can help implement the Probability Chess game myself?