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Subject: Any luck with ETC (Enhanced Transposition Cutoffs)?

Author: Artem Pyatakov

Date: 13:56:08 08/03/01


Has anyone here had any luck with Enhanced Transposition Cutoffs in their
program?

Just out of curiosity (and ease of SLOW/SIMPLE implementation of this idea), I
decided to try it.

The way I implemented it (just as a test), is by increasing move ordering
"priorityScore" for successor moves that promise a cutoff and thus trying these
moves first (but after the hash move).  But for some strange reason, I can't
even get it to marginally reduce the number of nodes.

This does not make sense to me, since I think that:
1) It's supposed to reduce the number of nodes at least somewhat
2) The reason most do not use is because the number of nodes that it eliminates
trades off with the computational time, NOT because this approach does not work
completely.

Any ideas? suggestions?

Thank you.

Artem



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