Monday, October 26, 2009

King and Rook checkmate


If you have only a king and rook left against your opponent's king, you can still get a checkmate.

The secret is to squeeze your opponent like a python into a corner. The rook forms two "fences" which your opponent's king cannot cross. The idea is to squeeze tighter with the rook whenever you can, but don't check, and don't give away your rook! Keep your king and rook together while you squeeze. If you can't squeeze with the rook, squeeze with the king. If you can't squeeze with either, make a waiting move - just like a python who waits for its victim to exhale, then squeezes tighter. You want to squeeze your opponent's king until he has only two squares. Watch out for stalemate when the king is in the corner. Let's look at all three positions before we look at the final checkmate.




Position 1 (above): Squeeze with the rook if you can. What's the best move?

Answer: Rd4 (Squeezes the enemy king's territory from 12 squares down to only 9 squares.

Position 2 (left): If you can't squeeze with the rook, squeeze with the king. What's the best move?

Answer: Kd4 (Squeezes the enemy king's territory from 12 squares down to only 10 squares. This prepares the way for Rd3 also.)
If you said Kc4, that's a good move too.










Position 3 (left): If you can't squeeze with the rook or the king, make a waiting move. What's the best move?

Answer: Ke5. Black will have to back up with his king allowing us either to squeeze with our rook or with our king.

When you finally squeeze your opponent down to two squares, you're ready to begin the checkmate. In the diagram below, your rook is in the perfect position - trapping the black king into two squares (a1 and b1). It would be a huge mistake to move your rook to b2! Why? That's right - it's stalemate. (The king has no moves but it is not in check. A stalemate results in a draw and each player gets half a point.) Look at the position. There is a long fence (a2 and b2) and a short fence (c1) coming out from the rook trapping the king in the corner. You want your king across the long fence - on b3. So Kb3 is the correct move. Your King is now perfectly placed for checkmate on the "death square". Your two choices for the death square are b3 or c2, but your rook is alread on c2. The death square is the square you want your king to be on to help deliver checkmate. (The death square works in many other endgames as well - KBB vs K, or KBN vs K)

Sometimes the position ends up like in the final diagram. This usually fools most beginners.

But here's a general secret for finding good moves - Think, "Where would my opponent like to move?" Then don't let him move there. This simple rule will help you win many games.

Apply this rule to the diagram on the left. First, your king is now perfectly placed for the checkmate on the death square. So we don't want to move our perfectly placed King. The Black King would like to escape to c1, so don't let him. What's the correct move?

Answer: I hope you said Rc3 or Rc4 or Rc5 or Rc6 or Rc7 or Rc8. That forces Black into the corner where you can checkmate him next turn. How?

Answer: Rc1 checkmate!


Thursday, October 22, 2009

Checkmate with King and Queen


Although there are many ways to checkmate with a king and queen, the easiest method is to keep the king and queen together and march toward the enemy king until the king is sent reeling with its back to the wall against an edge of the board.

At this point you must be careful to avoid stalemate. The next step is to pin the king against the edge of the board with your queen. So if the king is on rank 1, you want your queen on rank 2. If the king is on rank 8, you want your queen on rank 7. If the king is on file a, you want your queen on file b. If the king is on file h, you want your queen on file g. If the king is in the corner, you must be careful not to stalemate with your queen - for example, if the King is on a1, a queen on b3 or c2 is stalemate.

In the above diagram, what is White's best move?
What are some of the worst moves?

Answer: Worst Kd3 or Ke3 which are both stalemate.
Other worst moves would be Qe2+, Qd1+, Qf2+,and Qf1+ which give away your queen.
Best move - Qg2 pinning the enemy king against the edge of the board.
Checkmate: 1. Qg2! Kd1 2. Kd3! Kc1 3.Qc2 checkmate. This is the position I call the
"Kiss of Death". (See the 3rd position below. The first position is also a "Kiss of
Death" position, this time in the corner.) There are several other basic checkmate
positions as shown below.

Checkmate with two rooks




Checkmate with two rooks (or sometimes a rook and a queen) is a common theme. Beginners should master the basic mates and this is one of the most basic. Start with just two rooks anywhere on the board and the opponent's King. Use a technique often called the ladder.
A rook creates a "fence" that the enemy king cannot get past. In the diagram on the left, the Black King cannot move up the board because of the rook on a5 which creates an impassable "fence" on the 5th rank. We'll use the other rook to create a fence on the 4th rank. Then we'll alternate rooks going down one rank at a time like climbing down a ladder.
1. Rb4+ Kd3
2. Ra3+ Kc2



Now we can't play Rb2 as we planned, so we'll have to find a safer place for that rook. Let's just go over to the other end of the board where we're save from the king.

3. Rh4 Kb2
4. Rg3! (not h3 which would block our other rook)
Kc2
5. Rh2+ Kd1
6.Rg1 checkmate!








Of course not every game ends so easily. Let's use the same theme to threaten mate and win. In the final diagram, can you find the winning sequence of moves for White?


















Answer to last problem:
1. Rb1+ Rd1
2. Rh1+ Rf1
3. Rxf1+ Kxf1
4. Rxd1 (White now has an easy win.)