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Subject: Re: Towards a causality facility

Author: Tony Werten

Date: 06:47:42 09/18/03

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[D] rnb1kbnr/ppp1pppp/8/3q4/8/2N5/PPPP1PPP/R1BQKBNR b KQkq - 1 3

A program is playing Black with the above root position as position "P".  The
first move on the list, M1, is a6.  The search tries this and gets a poor score
and a causal data structure.  The program applies the next move M2 on the list,
a5, to the data structure and sees that the constraints that produced the bad
score for M1 also produce a simisar score for M2, so M2 is not searched.

Some of the constraints in this case:

1. The wN/c3 remains there, unpinned, and able to capture bQ/d5

2. The bQ/d5 remains there and is undefended

3. Black has no known counterattacks or other resources within the depth of the
subtree search.



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