class UniqueRectangleTypeOneStrategy implements Strategy {

	static getTests() {
		[
			/*
			 * (1,1), (1,6), and (2,6) all contain [28]
			 * (1,2) contains [248]
			 * '4' can be
			 */
			new Test('..3179.6579.6351..615842793567314829431298657..9567...17.956...9.67835..358421976',
				{
					! it.getCell(1, 2).hasMark(2) && ! it.getCell(1, 2).hasMark(8)
				}
			)
		]
	}
	
	boolean play(Board board) {
		def madePlay = false
		for (pivot in board.cells.findAll {
			it.markCount == 2
		}) {
			for (pincer1 in pivot.row.findAll {
				it != pivot && it.marks == pivot.marks
			}) {
				for (pincer2 in pivot.col.findAll {
					it != pivot && it != pincer1 &&
					it.marks == pivot.marks && ( pincer1.block == pivot.block
						^ it.block == pivot.block
					)
				}) {
					println "potential rectangle at $pivot, $pincer1, $pincer2"
					for (target in ([pincer1.row, pincer1.col].flatten().intersect([pincer2.row, pincer2.col].flatten()) - pivot)) {
						for (n in pivot.marks) {
							madePlay = target.removeMark(n, this) || madePlay
						}
						if (madePlay) {
							return true
						}
					}
				}
			}
		}
		false
	}

}