ss="extype" name="ostinato.core.XY">XY</a></span>, <span name="board">board: <a href="ChessBoard.html" class="extype" name="ostinato.chess.core.ChessBoard">ChessBoard</a></span>)</span><span class="params">(<span class="implicit">implicit </span><span name="rules">rules: <a href="ChessOptimisations.html" class="extype" name="ostinato.chess.core.ChessOptimisations">ChessOptimisations</a></span>)</span><span class="result">: <span class="extype" name="scala.Predef.Set">Set</span>[<a href="ChessAction.html" cl