|What Is a Ladder Checkmate? | Chess|
http://www.thechesspedia.com Sports News
Now the idea behind the ladder mate is we want to force our opponent's king into one of the four corners. The four corners being the H file, the A file, the eighth rank, or the first rank. We're going to use our control of the ranks and files. Together, these two pieces are going to force the king into one of the four corners and, ultimately, execute the checkmate. In this position, these two pieces are currently controlling the B file.