Allow immediate draws if opponent has no mating material #16989
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…immediately end the game as a draw.
…s' into insufficient-material-draw-claims
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Thanks! Just to be sure, did you try it in an actual game? |
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@ornicar Yup, I tested it in a few games and seems to work. There's no reason given for the draw though after the game is done, it just displays "Draw". I don't know if it's worth adding new messages like "White/Black claimed a draw", or if just "Draw" is sufficient. |
* With variants, it's not correct to assume that all remaining cases are about insufficient material. Would have to be handled in insufficientMaterial() branch above. * Insufficient material does not have to be "claimed". The arbiter should end the game immediately, and lila does it automatically (if detected).
| _ <- proxy.save(progress) | ||
| _ = publishDrawOffer(progress.game) | ||
| yield List(Event.DrawOffer(by = color.some)) | ||
| if pov.game.situation.copy(color = color).opponentHasInsufficientMaterial then |
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We cannot just swap the color and check for opponentHasInsufficientMaterial because it's not only depends on pieces on the board, but also whose turn to play. Look at this antichess position: https://lichess.org/analysis/antichess/8/8/3N4/8/1n6/8/8/8_w_-_-_15_44 (from #17536) whoever play can win the game so pov.game.situation.copy(color = color).opponentHasInsufficientMaterial is true for both sides, even though in real game only White can win.
If player A offers a draw when they have mating material but player B doesn't, call the game a draw immediately.