https://chesschest.com/%d0%b5%d1%81%d0%bb%d0%b8-%d1%80%d0%b5%d1%88%d0%b8%d1%88%d1%8c-%d1%8d%d1%82%d1%83-%d0%b7%d0%b0%d0%b4%d0%b0%d1%87%d1%83-%d1%82%d0%be-%d1%88%d0%b0%d1%85%d0%bc%d0%b0%d1%82%d1%8b/
Если решишь эту задачу, то... #шахматы