Zeno 2.0

Changes

• Fix pv_search (alpha update)
• Countermove Heuristic
• Static exchange evaluation
• History Heuristic
• Null move pruning
• TT change: do not return the evaluation in a case of a TTFlag::Exact (to avoid drawing winning game)
• Check Extensions
• Late move reductions

• Zeno 2.0 vs Zeno 1.0

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Results of Zeno 2.0 vs Zeno 1.0 (8+0.08, NULL, NULL, UHO_Lichess_4852_v1.epd):
Elo: 328.36 +/- 6.02, nElo: 449.43 +/- 4.82
LOS: 100.00 %, DrawRatio: 13.44 %, PairsRatio: 46.56
Games: 20000, Wins: 16205, Losses: 1454, Draws: 2341, Points: 17375.5 (86.88 %)
Ptnml(0-2): [38, 144, 1344, 1977, 6497], WL/DD Ratio: 11.22
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Player: Zeno 1.0
  Timeouts: 0
  Crashed: 3

Finished match
Total Time: 06:02:16 (hours:minutes:seconds)

Post-Convergence rating estimation
done
   # PLAYER      : RATING    POINTS  PLAYED    (%)
   1 Zeno 2.0    : 2465.6   17375.5   20000   86.9%
   2 Zeno 1.0    : 2134.4    2624.5   20000   13.1%

Full Changelog: 1.0...2.0