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Deiri Counting
The value of a play indicates its urgency. Normally you should play the largest play, but there are exceptions. (See tedomari.) The two main styles of evaluating plays are deiri (DEH-EAR'-EE) counting and miai (ME-EYE') counting. Miai values directly indicate the urgency of plays, while deiri values do so indirectly. Let me start with a couple of examples.
If Black plays first she scores 4 points, represented as a positive integer, +4. If White plays first he scores 2 points, represented as a negative integer, -2. The deiri value is the difference between these two results, or 6 points.
After W 1 the score is -5. After B 1 White must play W 2 to live, and the net score is + 2. The deiri value is the difference between these two results, or 7 points. We may define deiri values as the difference between the count of the first stable position after Black plays first (called a Black follower) and that of the first stable White follower, assuming normally correct play. A stable follower is one with a lower urgency than the original position. There is a potential circularity here, but a line of play eventually ends, as here, in a scorable position, or in a repetition, which is prohibited by the rules. (If it is not, the original position does not really have a value.) This is a copy of the living page "Deiri Counting" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |