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Use fail soft in null search
authorMarco Costalba <mcostalba@gmail.com>
Sat, 20 Mar 2010 11:42:23 +0000 (12:42 +0100)
committerMarco Costalba <mcostalba@gmail.com>
Sun, 21 Mar 2010 14:12:44 +0000 (15:12 +0100)
If null search fails high return null value instead of beta.

With TT hash there may be a small advantage for fail-soft since
storing slightly better bounds may cause slightly more hash hits.

After 990 games at 1+0
Mod vs Orig +171 =665 -154  +6 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

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