34 lines
1.0 KiB
Scala
34 lines
1.0 KiB
Scala
package lila.importer
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import chess._
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private object Chess960 {
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def isStartPosition(board: Board) =
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board valid {
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def rankMatches(f: Option[Piece] => Boolean)(rank: Rank) =
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File.all forall { file =>
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f(board(file, rank))
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}
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rankMatches {
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case Some(Piece(White, King | Queen | Rook | Knight | Bishop)) => true
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case _ => false
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}(Rank.First) &&
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rankMatches {
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case Some(Piece(White, Pawn)) => true
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case _ => false
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}(Rank.Second) &&
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List(Rank.Third, Rank.Fourth, Rank.Fifth, Rank.Sixth).forall(rankMatches(_.isEmpty)) &&
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rankMatches {
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case Some(Piece(Black, Pawn)) => true
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case _ => false
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}(Rank.Seventh) &&
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rankMatches {
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case Some(Piece(Black, King | Queen | Rook | Knight | Bishop)) => true
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case _ => false
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}(Rank.Eighth)
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}
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}
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