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Have you also noticed some AI trouble in Chessmaster PC game?

I can say I am an average player, about 1600 -1700 (Chessmaster rating after hundreds of games, also former club player at about 1600…).

Chess software sort of works in this way:

In a program such as Chessmaster, the same engine is used to calculate all moves, regardless of which “personality” you’re playing against…. also, the program will find the 2nd best move in a position, the 3rd best move, the 4th best move, and so on…

Basically, the higher the personality’s “rating” the more likely it is to make the “best” or “2nd best” move in any situation. Probabilities are assigned for each personality as to how often they’ll make the “best”, “2nd best”, “3rd best”….down the the “worst” move in its move list.

This is why a AI personality ranked as an “expert’ or higher will occasionally make a totally boneheaded move, something that a human player ranked at that level would never do. It simply comes up with that one-in-a-thousand (or whatever the odds are) chance of making the 9th best move in a situation.

That’s why highly rated AI personalities will play “great” chess for a long series of moves, and then throw the game away by doing something “stupid”… it might take a long time for that to happen, but it eventually will, if it plays enough games.

The lower rated personalities, of course, are programmed to constantly make moves that are far down the “best to worst” move list, which is why they’re much easier to beat consistently, even by average to below average players.

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