[HN Gopher] Pauli Chess
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       Pauli Chess
        
       Author : weinzierl
       Score  : 50 points
       Date   : 2020-03-28 07:57 UTC (15 hours ago)
        
 (HTM) web link (blog.plover.com)
 (TXT) w3m dump (blog.plover.com)
        
       | aj7 wrote:
       | Just switch the knights with the bishops, and you're in a
       | different universe.
        
       | [deleted]
        
       | symplee wrote:
       | Anyone have links to play online?
       | 
       | Some sites I can think of that support other variants:
       | 
       | https://lichess.org/ ( https://github.com/ornicar/lila/ )
       | 
       | And some crazier variants:
       | 
       | https://www.pychess.org/ ( https://github.com/gbtami/pychess-
       | variants )
       | 
       | https://chessvariants.training/
        
         | dwighttk wrote:
         | https://pippinbarr.github.io/chesses/
         | 
         | (doesn't have Pauli Chess, but does have some fun variants)
        
         | sova wrote:
         | I bet a superhero from lichess would be happy to bust this out
         | in a weekend
        
           | dmurray wrote:
           | Lichess's policy is generally not to implement tons of
           | variants, even those that would play nicely with PGN (this
           | wouldn't).
           | 
           | You could definitely hack this together on a fork of lichess,
           | but don't expect to see it on the main site.
        
       | mannykannot wrote:
       | "The main idea is: two pieces can be on the same square...
       | Pierre-Francoys says he wishes that more than two pieces could
       | share a square... The name "Pauli Chess", is inspired by the
       | Pauli exclusion principle, which says that no more than two
       | electrons can occupy the same atomic orbital."
       | 
       | Pierre-Francoys' variant would be Bose chess, I suppose?
        
       | downshun wrote:
       | Alphazero mastered chess by already-implemented self-play.
       | 
       | A slight change in the game rules can have a significant effect
       | on the game and strategy, as anyone that delves into chess
       | variants knows. Is the same true for their implementations?
       | 
       | What is the limitation for state of the art AI in adapting in
       | such a way to rule changes?
        
         | dabei wrote:
         | It's a very simple change, since the fundamentals of the game
         | is still the same. It should take no more than a day to change
         | the code and re-train the model.
        
         | shmageggy wrote:
         | Turns out DeepMind has already been working on exploring
         | variants with Vladimir Kramnik!
         | 
         | https://www.chess.com/article/view/no-castling-chess-kramnik...
         | 
         | Currently they have to train from scratch, but adapting to new
         | tasks is an active area of research for RL broadly.
        
       | karmakaze wrote:
       | > 5. Pieces of opposite colors sharing a square do not threaten
       | one another.
       | 
       | This is going to be strange with kings. You could capture a piece
       | in a square with a king and the king would require two moves to
       | capture it, and if it was a queen the king couldn't move. Then
       | just have to check the square for mate.
        
         | codeflo wrote:
         | There are not all that many ways this could happen, though. I
         | think you can only enter the square of the opposing king with a
         | pawn. With all other pieces, you'd have to threaten the square
         | first, which would be check. You could promote a pawn into the
         | king and create a queen on its square.
         | 
         | The other way would be if the king itself moves. If the king
         | moves onto a square with an opposing rook and a queen, and
         | decides to capture the rook, the king is trapped until the
         | queen moves. In this scenario, the queen must have moved there
         | in the last turn, putting the king in check. Maybe that's a new
         | way to get a stalemate.
        
         | jackhalford wrote:
         | I don't think that could happen, if an opposing king shares a
         | square with another piece, you would choose to take the king to
         | win the game.
        
       | lihaciudaniel wrote:
       | Either two pieces can be on same square this would definitely
       | mess with tactics. But strategically speaking is just like normal
       | chess but with more squares
        
         | crystaln wrote:
         | Not at all. As the page says, you can't block pawns, which
         | entirely changes the game. You also don't need to move pawns to
         | develop pieces.
        
           | esrauch wrote:
           | You can still block pawns using a pawn plus another piece.
        
             | gpm wrote:
             | Can you? The rules are unclear. Interpreted literally they
             | would mean that the pawn could move into the square
             | (directly in front of it) and then take one of the
             | opponents pieces in that square.
        
               | dwighttk wrote:
               | >All pieces move and capture the same as in standard
               | chess
               | 
               | so pawns have to capture diagonally still... I guess if
               | you want to see 4 as an exception to that then they can
               | capture straight ahead, but I'm assuming it isn't.
        
           | sova wrote:
           | Super leaky chess? Looking forward to an implementation so I
           | can try and wrap my mind around how it works. What's to
           | prevent both players from pushing all pawns through the leaky
           | sieve and promoting everything to Queens right off?
        
             | downshun wrote:
             | Captures
        
       | oh_sigh wrote:
       | Other chess variants beyond the common: 1) friendly fire is on.
       | You can capture your own pieces if you want.
       | 
       | 2) You can move yourself into check, but only if you checkmate
       | your opponent simultaneously, in which case the game is a tie
        
         | sixstringtheory wrote:
         | One of my favorite variants is suicide chess. The goal is to be
         | the first to lose all your pieces. All rules are the same with
         | one addition: if you can take a piece, you must.
        
           | kick wrote:
           | It's really fun! You can play it on Lichess under
           | "Antichess."
        
       | [deleted]
        
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       (page generated 2020-03-28 23:00 UTC)