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checkers rules #3

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gilberto85 opened this issue Nov 11, 2022 · 22 comments
Open

checkers rules #3

gilberto85 opened this issue Nov 11, 2022 · 22 comments

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@gilberto85
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i dont know but i saw your video and this is not american checkers rules

https://www.itsyourturn.com/t_helptopic2030.html
@stillonearth
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Those should be English Checkers. Do you need American checkers?

@gilberto85
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yes

@stillonearth
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Check the updated video. Rules as of now:

  • getting an extra turn for a piece if you ate an opponent
  • crowning

@gilberto85
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Hi there thank you I saw the video but american checkers jumps are mandatory

@stillonearth
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They are. Check 16th second on vid

@gilberto85
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Sorry the only video I see is this
Checkers.on.Bevy.2022-11-16.19-08-04.mp4

And its not jumping according to American checkers rules btw you have a very good skills

@stillonearth
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Yeah, that's the one

Where exactly you see an error in this ruleset:

  • piece can move 1 square in advancing forward
  • piece get an extra move if it eaten an opponent's piece
  • after crowning a piece can move diagonally without restriction on number of squares

@gilberto85
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gilberto85 commented Nov 16, 2022 via email

@stillonearth
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Okay, seems I'm getting it now.

@gilberto85
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Hope that video can help you

@gilberto85
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Also multiple jumps are mandatory

@gilberto85
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Is that much to change ? I don't know what kind of checkers is that rules now I don't know if it's Italian rules

@stillonearth
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stillonearth commented Nov 18, 2022 via email

@gilberto85
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gilberto85 commented Nov 18, 2022 via email

@stillonearth
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stillonearth commented Nov 18, 2022 •
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This project supports wasm targets so you can depoy on web (though neural AI won't work with wasm, an investigation required). With some adjustments multiplayer is also possible. I'll make an example branch with american rules adjustments.

PRs are welcome if you'll choose to use this codebase.

@stillonearth
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stillonearth commented Nov 18, 2022 •
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This branch implements American ruleset (i.e. jump mandatory is possible): https://github.com/stillonearth/CheckersOnBevy/tree/american-ruleset

The changes are in pub fn possible_moves(&self) -> [Vec<Position>; 24]:

  1. Check whether current moveset for a given side contains a 'Take` move:
let mut american_jump_possible: HashMap<Color, bool> = HashMap::new();
for i in 0..24 {
    let p = self.state.pieces.iter().find(|p| p.id == i);
    if p.is_none() {
        continue;
    }

    let color = p.unwrap().color;
    for j in 0..24 {
        let p = self.state.pieces.iter().find(|p| p.id == j);
        if p.is_none() {
            continue;
        }

        let other_color = p.unwrap().color;

        if other_color == color {
            let jump_possible = moveset[j as usize].iter().any(|m| m.1 == MoveType::Take);
            if jump_possible {
                american_jump_possible.insert(color, true);
                break;
            }
        }
    }
}
  1. Filter out regular moves if so.

That's enough to limit AI, and there's another check in Game::step

let moveset = self.possible_moves();
if moveset[piece.id as usize].len() == 0 {
    // self.state.turn.change();
    return (MoveType::Invalid, &self.state, self.check_termination());
}

@gilberto85
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gilberto85 commented Nov 18, 2022 via email

@gilberto85
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gilberto85 commented Nov 18, 2022 via email

@gilberto85
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gilberto85 commented Nov 18, 2022 via email

@stillonearth
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You're talking about this vid right? https://github.com/stillonearth/CheckersOnBevy/tree/american-ruleset

In that branches attack moves are mandatory.

@gilberto85
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gilberto85 commented Nov 18, 2022 via email

@stillonearth
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That's probably an animation issue, as they are not queued now.

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@gilberto85 @stillonearth