<p>The book offers 100 puzzles with discovered attack and discovered check. Real chess games are used to create those puzzles.&nbsp;Please keep in mind that these are do-it-yourself exercises therefore you must be familiar with all of the basic chess principles.<br><br>~&nbsp;When a player moves a piece out of the way to expose a previously blocked attack by another piece this would be known as a discovered attack.<br>&nbsp;</p><p>~ In a discovered check one piece moves allowing a bishop rook or queen to open a line towards the opposing king.</p>