Chess engine: Viridithas II 2.3

v.2.3:

The new features are (roughly in order of addition):

saturating history values to prevent overflow

static eval guarding to prevent wasting time in nullmove

removal of hybrid TT bucketing in favour of single buckets with smart replacement

history counters of moves that were too early are decremented on beta-cutoffs

introduce the concept of "improving", which is true when the current position is statically better than the one two ply ago

beta pruning with dynamic margin based on depth and "improving"

late move pruning

transposition table pv fail reductions

ban double-nullmoving

make LMR more aggressive for moves in non-improving positions

futility pruning is much simpler and slightly more aggressive

Excitingly, no changes to evaluation have been made between 2.2 and 2.3, so the entirety of the rating gain is due to improvements in search.

github:https://github.com/cosmobobak/virtue/releases/tag/v2.3.0

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