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PLAY CHESS AGAINST COMPUTER TRIAL

Strengths and Weaknesses in Computer Play Strengths So a lot of work in computer chess goes on ensuring that the tree of variations is grown appropriately, and that branches that are tactically interesting receive more attention. Similarly we must ask how big to grow the tree – well obviously the time constraints of tournament play restrict our choice – but also we don’t want to stop in the middle of a sequence of captures and recaptures – as the evaluation function might wrongly conclude we are a piece up or down incorrectly. Humans are thought to be particularly good at recognizing the significant moves in a position – it is believed that Grand masters only consider an average of 1.7 moves in any position (obviously recaptures keep the average down). This means it may not consider all possible sacrifices very deeply.Įffective pruning is vital to ensuring we consider only the most appropriate moves.

Having identified lines that are not promising, it will not evaluate these lines as fully to save time. Mostly the computers use techniques based on ordering moves, so they try the most promising first. It is important to identify quickly when a particular variation is not worth following up.

Chess positions have a lot of variations, and the more possible positions we come up with the more time must be spent evaluating them. This means it has less time for calculating the possible variations, and so a more complex evaluation function may result in loss of tactical ability. Yet, clearly some more sophistication is needed in the evaluation function to play sensible chess. How chess computers calculate variationsĪs you can see the computer may be doing a lot of work in evaluating a single position. A positive score means the computer is ahead and a negative score means that the human is ahead. The computer subtracts your score from its own score.

Various end games related advantages – such as avoiding having the wrong rooks pawn in a King and Bishop ending.

Developing minor pieces before the Queen.

The evaluation function of commercial chess programs is generally a closely guarded secret, but generally speaking it takes into consideration the following factors: In this sense the evaluation function contains the strategic knowledge the computer has of chess. A compromise is to grow the list of variations as large as possible, in the time permitted, and then use an evaluation function to try and decide the likely outcome from the final position of each variation.Ĭomputers use evaluation functions to determine as accurately as possible the likely outcome of the game from that position, however it doesn’t need to take account of a great deal of tactical information, as hopefully the tactics in the position are taken care of in the variations themselves. Even for the strongest computers nowadays, this approach is clearly impractical. There is a simple way to play perfect chess: write down all the possible games of chess, note if the final position is won, drawn or lost, and then working backwards assume each player chooses the best line, you will eventually end up with a list of all the best possible games of chess.

So make up your mind and click here to subscribe to the “Learn to beat computers chess course” by the International Chess University. The chess tutorials or lessons are delivered using a learning platform developed to satisfy your needs and make you feel welcome in our community. We are committed to provide some of the best online chess lessons. IchessU is the only online chess school where you can learn chess from some of the best chess tutors. The piece values are the same, but not all humans would consider some of the other factors that a computer does. A chess computer assesses who is ahead in a slightly different way to how many human players would. But, fortunately, they still have weaknesses, so with a little preparation the results of playing against chess machine can be improved. Since Deep Blue victory over Gary Kasparov it has become apparent to all that computers are very good at playing chess.

PLAY CHESS AGAINST COMPUTER TRIAL

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