A King and Bishop alone cannot mate the lone King, but a King and two Bishops can. Therefor it is very important to assure that the King doesn’t capture one of the Bishops during the mating attempt.
In addition stalemate has to be avoided and we have to accomplish the mate within 50 moves, but after this lesson this should not be a problem.
It is not too difficult to force checkmate with a King and two Bishops against a lone King, but it is certainly more difficult than checkmating with a single Queen or with a single rook.
The diagram on the left illustrates the most typical mating pattern. Other mating patterns are possible, but in general this is the mating pattern that you should try to accomplish.
White’s light-squared Bishop and the White King are covering all of the squares to which the Black King might retreat and Black has been checkmated by White’s dark-squared Bishop.
The second diagram illustrates one of the most important ideas of the mating process. The two Bishops have created a prison for the Black King and the King is unable to approach the Bishops. The White King is free to move.
Essentially White wins by forcing the Black King to the side of the board, then to a corner, and then checkmates.
We start from a rather difficult position in which the Bishop is attacked by the King and our own King is placed in a corner.
1.Bb4 Kd4 2.Kb7 Ke3 3.Bb5 and now we have placed the Bishops in such a way that the Black King is locked up within a large triangle. 3…Kd4 4.Kb6 Kd5
Not the fastests, but mayby easier to see 12.Be2+ because the size of the triangle is decreased again in the same way. 12…Kg3 13.Kf5 Kh3 14.Bf3 Kg3 15.Ke4 Kh3 16.Bf4 and the Black King can only move between h3 and h4. 16…Kh4 17.Ke3 Kh3 18.Kf2 Kh4 Now the Bishop is placed aside to enable Black’s King to move to h2. 19.Be2 Kh3 and taking away h4: 20.Bg5 Kh2 21.Bf1 Kh1 22.Bg2+ Kh2 23.Bf4#
The next chess lesson is about the Knight Fork. You will see that the Knight can become more powerful than you may have thought at first sight.
You have to know some of the checkmates in order to know what you are looking for when playing a chess game. Some of these basic checkmates even have a name. By studying this kind of diagrams you may be able to avoid or to make use of similar positions during your own games.
King and Queen checkmates
King and Rook checkmates
Back rank checkmate
Many beginners often oversee this kind of Mate. You have to pay attention to this kind of mate opportunities when you run into this kind of positions.
To prevent being mated like this it may be a good idea to have an escape square for the king.
Scholar’s Mate is the most common opening trap a beginner falls into.
In this checkmate both the Bishop and Queen attack the weak f7 pawn. This pawn is weak because, in the starting position, it is only protected by the King.
In the epaulette mate the King is on its back rank and the Rooks of its own color on either side are blocking off the king’s escape route.
But for the mating pattern it doens’t matter if other pieces then Rooks are involved, as long as they are of the same color.
The next ches lesson is Checkmating with the Queen.
|White to move Position after move 32 0 half-moves after last pawn advance or capture
White is able to win the game. Find the right moves.
If needed I’ll add the solution to the comments.
4 Responses to “White to play and win”
1. Rf1+ Kg8
2. Rf8+ Kg7
1. … Kg7
Edited by admin at Januari 7th, 2011
Replaced d8N+ by e8N+ (twice)
Black can delay the mate a little bit by
1.Rf1+ Qf3 2.Rxf3+
In the …Kg8 variation there is also an alternative for white
2…Kg8 3.e8=Q+ Kg7 4.Rf7#
But the main idea about this exercise is that you’ll see the e8N# possibility, so these are only details.
Shouldn’t it end on e8N#? After the three move sequence.
I’ve racked my brain over this, but I don’t see how one promotes on d when there is nothing to force the pawn diagonal.
@ Robert Evans
Of course you are right
I have updated the comment at the top
A discovered attack occurs when a player moves one of his pieces out of the way of his Queen, Bishop or Rook to reveal an attack on one of his opponent’s pieces. Because the piece moved can make a independent threat the result may also be a double attack.
In the next diagram white’s rook on e1 will place the king in check if the bishop on e4 moves away. This is an ideal situation for a discovered attack. We only have to look for a target for the bishop.
White will play the move 1.Bc6+
In a normal situation the square c6 would not be a safe place or the Bishop. It is defended by both the Queen as well as a pawn. But in this case of a discovered attack, a discovered check, black has to get the king out of check, probably by a move like 1…Kf8.
Now white can capture the queen for free: 2.Bxb5.
The targets of a discovered attack aren’t limited to pieces only. You may want to read the lesson about the targets again. Try for example to find the appropriate discovered attack in the next diagram.
You can make the solution visible by selecting the text between the two square brackets.
[1.Bd3 threatens a mate with the queen (2.Qf6#) as well as capturing the rook on a6.
( 1…Ra8 2.Qf6# )
The next lesson in this series is about the Skewer.
In the skewer two pieces in a line are attacked by a queen, rook or bishop. A skewer is very similar to the pin, but in case of the skewer the most valuable piece is the front piece. So instead of being pinned the piece has to step out of the way allowing the piece behind it to be captured.
The front piece is often a king, but it may be another piece.
In the following diagram white can administer a skewer by 1.Bc4+.
After 1.Bc4+ black has to move the king.
E.g. 1…Kg7, after which white can capture the queen 2.Bxg8.To spot possible skewers (and pins) you first have to look for valuable pieces on the same diagonal, line or file. The second step is to find the right attacking piece.
After playing 1.Be4 in the diagram on the left the resulting position can be called a pin or a skewer, because the value of the front piece is the same as the value of the back piece.The name doesn’t matter either.
After 1…Rbb6 2. Bxc6 Rxc6 white has gained a rook for a bishop.
At first sight the third diagram seems to have a possibility for a skewer. But this time white doesn’t gain anything by the move 1.Be4.
Black is able to play 1…Rc1+ after which white has to play 2.Kg2 and black can move the second rook to a save place 2…Rb2.
In one of the previous lessons 4 possibilities to eliminate the defender have been shown:
This chess lesson will be focussed on Interference, also known as blocking the defender. The general idea is to block the line between the defender and the piece or square it is trying to defend.
An illustrative example of this tactical motif is shown in the diagram on the left. The white Rook is attacking the black Knight, but this Knight is defended by the black Rook. By playing 1.d4+ the protection is removed and the Knight can be captured 2.Rxh4.
Please note that it is only possible to block a horizontal, vertical, or diagonal line. It will be impossible to block a defending Knight, pawn or King.
Let’s have a look at the next diagram. It’s Black’s turn to move. No pieces are attacked, but White’s Queen is an important defender. Without this Queen it was a mate in one.Black can block this defender by 1. …Ra5+, and White has to play 2. Qxa5 to prevent the mate, but also makes that his Queen will be captured 2…bxa5.
The mate can not be avoided 3. Kb1 Bg6+ 4. Rc2 Qf1+ 5. Ka2 Bxc2 6. Be1 Qxe1 7. d5 Qb1+ 8. Ka3 Qa1#.
A nice example of interference, showing that we have to consider more targets than the attacked pieces.
This third diagram gives another example. It is White’s turn to move.
White has a kind of double attack by means of a queen fork, but each of the rooks is defending the other one. The move 1. d6 blocks this line and Black will be unable to bring both rooks to safety at the same time. Black’s best move is probably 1…Raxd6, but then White will continue with 2.exd6. This example illustrates that it is not necessary for the inferfering piece to attack anything at all.
I will leave the solution of this last exercise to you. It is White’s turn to move.You are invited to add the solution to the comments.
To give a clue: It is a combination of a discovered attack and interference.
The next lesson is a nice example game of interfering: Tarrasch -Allies (1914).
7 Responses to “Interfering”
1. Bh7 Qxe2
OK, but I don’t think that Black is going to play 1…Qxe2, but probably 1…Rxh7
It is obvious! 1.Nxf7 and White wins.
Sorry, but it isn’t that obvious
1.Nxf7 gives away the advantage
it will probably be followed by 1…d3 2.Qxd3 Kxf7
You have to look for a combination of a discovered attack and interference to find the right move.
- Tarrasch – Allies (1914)
In some of the previous lessons we have learned about the pin and how we could make use of a pin in order to win a piece. All these lessons started with a position in which two enemy pieces were aligned with each other. In order to create an absolute pin the opponent’s king has to be placed on the same line, file or diagonal as one of his other pieces.
The next step is to learn how to force this alignment.
Before I am going to write a lesson about this positioning of the opponent’s pieces I refer you to another site with some very interesting chess lessons, because it contains a lesson about Pushing the Enemy King into Line. The purpose of this lessons seems to be identical:
Our next task is to learn how to create that alignment when it doesn’t already exist. The principal tools we will use here are checks that push the king into a line with one of its fellow pieces, or that require an enemy piece to jump into line with its king to protect it. Or sometimes a capture may require a king to recapture and cause it to walk into a pin.
Therefor I am going to skip this lesson since a similar lesson exists at Chess Tactics Explained. This chess lessons site seems to be very interesting and consists of six chapters. These chapters deal with the following subjects:
- Double attack
- Discovered attack
- Pin and skewer
- Removing the guard
- Mating patterns
In addition to the on-line lessons a hard copy version of this site is available.
We continue with replacing a piece.
One of the most used examples of the classical bishop sacrifice is taken from the game Edgard Colle – John O’Hanlon, Nice 1930.
This is rather strange because in this game the normal preconditions before sacrificing the bishop aren’t even met. Some chess players and teachers even considered the sacrifice in this game as unsound. After looking at it more carefully I think that the sacrifice is sound, but that Black will probably be able to survive the attack.
Before going to the game I show two positions in which the classical bishop sacrifice enables White to win the game.
r1bq1rk1/pp1nnppp/4p3/2ppP3/1b1P2Q1/2NB1N2/PPP2PPP/R1B1K2R w KQ – 0 8
rnbq1rk1/pppn1ppp/4p3/3pP3/1b1P4/2NB1N2/PPP2PPP/R1BQK2R w KQ – 5 7
Now we will continue with the famous game from Edgard Colle.
Next lesson: The Rook and pawn vs Rook endgame.
Newest analysis – revised editions of Vukovic by Nunn in English (2003) and Treppner in German (2006) as well as issue 3 of Kassiber and Broznik’s Colle book – all show the sacrifice to be correct.
I also said that the sacrifice was sound, but with correct counterplay I still believe that Black will be able to survive the attack.
Das Colle-Koltanowski-System by Bronznik Valeri as well as the footnotes by John Nunn in Vuckovic’s book show the shortcomings in the original analysis of Vuckovic, who considered the sacrifice to be incorrect..