two player chess

Two Player Chess

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v_glorioso12 34 ( +1 | -1 )
..... in my books it says that a side is weak on the light or dark squares, and that it can lead to a win, but I DONT UNDERSTAND!!!!! if one side strives for complete domination of one square color, wouldnt the other be able to easily control the opposite color square? and how do you choose a color square that you should try to control???

Fat Nasty
lordnguyenvo 42 ( +1 | -1 )
Do they have examples in the book?I'm not sure if I'm getting it correctly but I think they're talking about situations in which a side has weak points in their pawn structure but doesn't have a bishop to guard it.Like Black's pawns are at f6,g7,h6,Black has a lot of weak light-squares.If Black doesn't have a light-square bishop then White's pieces are free to access those.
mate_you_in_fifty 42 ( +1 | -1 )
a common situation the fianchettoed king minus the bishop. All the pawns are on one colour and the opposite squares are consequently weak and can be exploited by the opponent who has(for example) a queen or a bishop that moves on those colours. Often these weaknesses deal with an important part of the board,not the entire board. Domination of a colour of squares isn't a goal,it's just a step to achieve an ultimate goal of checkmate ro winning material or etcetera.
caldazar 409 ( +1 | -1 )
"if one side strives for complete domination of one square color, wouldnt the other be able to easily control the opposite color square?"

Well, yes, I suppose that might be true, but the point is that a game may revolve around a few key squares of one color. If the critical squares are e4 and d5, do you really care if you have to concede control of less useful squares to your opponent in order to secure the important points?

Weak square color complexes arise due to the way pawns attack (diagonally). To have their pawns protect themselves, players usually arrange pawns along diagonals (pawn chains). As a result, in a pawn chain, there are simply fewer weaker pawns available for the opponent to attack (typically the pawn chain head and the pawn chain base are the targets). However, since pawns attack diagonally, in chains they cannot easily control squares of the opposite color. So to compensate for the holes that your pawns may leave in your position, you use the bishop that is not on the same-colored squares as your pawns since it's most efficient at guarding a large number of one color of squares. You can use knights and rooks too if you just need to control a few squares, or you can use your queen, although usually you'd want your queen doing more important things than defending a couple of squares (unless those squares were critical, of course; it all depends).

"and how do you choose a color square that you should try to control???

You choose to control squares that would make good posts for your own pieces or to prevent your opponent from posting one of his pieces in a useful position. It is sometimes difficult to gain control of squares that are controlled by enemy pawns (you have to capture the defending pawn or get it to budge if you want to post a piece to the currently-defended square) so sometimes it's better just to try to post your pieces effectively on squares the opponent's pawns do not control. A famous recent example of a weak square complex:

Kasparov-Shirov, 1994

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Ndb5 d6 7. Bf4 e5

White forces a weak square in Black's position, d5. Since Black can no longer control d5 with pawns, he will have to use pieces to fight for d5 if he wishes to retake control of the square and stop White from using that square as a post for one of his pieces.

8. Bg5 a6 9. Na3

This is what Black obtains in exchange for losing control of d5. White will need to spend some time to bring the a3 knight back into play, by which time Black hopes to have his active play well underway.

9... b5 10. Nd5

The weakness of d5 allows White to post his knight to this useful light square, where it controls many dark squares deep in Black's territory.

10... Be7 11. Bxf6 Bxf6 12. c3 Bb7

Black's light-squared bishop will be key. Since his central pawns are on dark squares, he needs to use pieces to control the light squares, and the bishop is the most efficient piece to use to accomplish this.

13. Nc2 Nb8

Getting out of the way of the b7-bishop and heading for d7 and then to b6, c5 or f6 where the knight would control some more light squares.

14. a4

Fighting for control of c4 since the square would make a good home either for the c2 knight or the c4 bishop.

14... bxa4 15. Rxa4 Nd7 16. Rb4 Nc5

White has achieved his aim of gaining access to the c4-square, but Black has also achieved his goals, posting his bishop where it will attack key central light squares and posting his knight to challenge control of squares such as e4, d3 and b3. Both sides are fighting for control of important central light squares.

17. Rxb7 Nxb7 18. b4

In two moves, White ends Black's challenge and wins the battle for the light squares by exchanging off material to neutralize Black's piece control of those squares. White's pieces will now easily move into position on the light squares, with the c2 knight coming to c4 to pressure d6 and threaten potential knight leaps to b6 while the bishop will come to d3 to secure the pawn on e4 (which in turn secures d5).
philaretus 58 ( +1 | -1 )
As other contributors have pointed out in various ways, the white and black squares may not have equal importance in a particular game. Furthermore, it doesn't follow that weakness in one colour confers dominance in the other. For instance, if most of your pawns are on white squares and you exchange your black-square bishop for a knight, your opponent may be able to penetrate your position at will with his black-square bishop, but it doesn't follow that your white-square bishop will have similar power over him.