Author: Larry Griffiths
Date: 11:54:56 01/20/99
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J., Robert, and Karinsdad, Thank you for your replys. I disabled some extension code and was able to get the AB and the Minmax only to produce the same scores and moves. I will look at the extension code and try to figure out where my thinking has gone south. I want to be able to do extensions when a king is in check or on captures since I do not have a swap-off routine in the scoring function. I am trying to overcome some of the nastyness of the horizon effect by going deeper on captures. Example: Black has a Bishop on A8, a Pawn on B7, and a Rook on B8. White has a Queen on A1. (forget about Kings in this example). With Black to move and using a depth of two plys, Any move by Black will be responded to by White with the Queen capturing the Bishop on A8. It appears that White has won a Bishop but at three plys Black sees that the rook must stay on the 8th rank to protect the bishop and capture the Queen should white venture such a foolish move. The example above is clear to me but things seem to get much more complex at deeper plys. Are there any good articles on Selective Extensions and how to handle the horizion effect? (Besides NULL moves). Thanks!
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