Chess Back Rank Checkmates - Exercises Page 1
Each exercise looks at a different theme associated with back rank mates.
Exercise 1 - Ineffective Interposition
This first exercise looks at the theme of interposition moves. Black appears to defend the back rank with his Rook and Bishop. Can white mate on the back rank?
Exercise 2 - Effective Interposition
Here's another example where black has several interposition moves. Can white mate on the back rank?
Exercise 3 - Counting
White has a huge battery set up, and is ready to drive down to the back rank. But black has multiple defenders ready to come to his King's aid. Can white deliver checkmate?
Exercise 4 - Removing the Guard
This time 1. Rd8+ doesn't work (calculate it out in your head to verify). Black's two Rooks both defend the d8 square. How can white use the removal of the guard idea to checkmate on the back rank.
Exercise 5 - Driving the King Away
White has a tricky move to drive the black King into a vulnerable position. See if you can find it.
Answers
Ex 1: Yes. White mates with 1. Ra8+. Black has two useless interpositions: 1... Bb8 2. Rxb8+ Rc8 3. Rxc8#.
Ex 2: In this case, the answer is no. If white plays 1. Ra8+, black can successfully interpose with 1... Rd8 or 1... Bd8. The key difference between Ex 1 and Ex 2 is that in the latter, both black's pieces can interpose on the same square. The Rook and Bishop each provide support to the blocking d8 square.
Ex 3: Yes. White attacks the d8 square 3 times, while black defends it twice. White wins with 1. Rd8+ Rxd8 2. Rxd8+ Rxd8 3. Qxd8#.
Ex 4: White wins with 1. Qxb8+! Rxb8. And now white has two rooks attacking the back rank, while black has only one. The game ends with 2. Rd8+ Rxd8 3. Rxd8#.
Ex 5: The winning move is 1. Ne7+ Kh8 driving the King back into the corner. White then mates with 2. Rxf8#.