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Revert saving of null search value in TT

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Revert all the patches that introduced the change and
more or less fixed the zugzwang issue.

There is a gain against last current version and we
can remove a lot of code.

After 979 games at 1+0 on my QUAD
Mod vs Orig +152 =688 -139 +5 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-04-16 06:19:33 +01:00
parent ec0a650dff
commit 65c2715d9a
3 changed files with 39 additions and 59 deletions
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10
src/value.h
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@@ -33,16 +33,14 @@
////
enum ValueType {
VALUE_TYPE_NONE = 0,
VALUE_TYPE_NONE = 0,
VALUE_TYPE_UPPER = 1, // Upper bound
VALUE_TYPE_LOWER = 2, // Lower bound
VALUE_TYPE_EXACT = 3, // Exact score
VALUE_TYPE_EVAL = 4, // Static evaluation value
VALUE_TYPE_NULL = 8, // Null search value
VALUE_TYPE_EV_UP = VALUE_TYPE_EVAL | VALUE_TYPE_UPPER,
VALUE_TYPE_EV_LO = VALUE_TYPE_EVAL | VALUE_TYPE_LOWER,
VALUE_TYPE_NS_LO = VALUE_TYPE_NULL | VALUE_TYPE_LOWER
VALUE_TYPE_EXACT = VALUE_TYPE_UPPER | VALUE_TYPE_LOWER,
VALUE_TYPE_EV_UP = VALUE_TYPE_EVAL | VALUE_TYPE_UPPER,
VALUE_TYPE_EV_LO = VALUE_TYPE_EVAL | VALUE_TYPE_LOWER
};