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Chess engine: Fatalii 0.6.0

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Fatalii - UCI chess engine
Author: Patrick Heck,  Rating CEDR=2388

v.0.6.0:
Search
Switch from fail-hard to fail-soft alpha-beta search
Add static exchange evaluation (SEE)
Use SEE for move ordering
Skip losing captures in quiescence search
Use subtree size for root move ordering
Add check extensions
Add delta pruning in quiescence search
Use futility and reverse futility pruning at depths > 1
Add late move reductions
Improve null move pruning
Only do null move pruning if the static evaluation is greater than or equal to beta
Do not play 2 null moves in a row
Reset killers for the next ply before playing a move
Persist history table between searches
Play forced moves immediately, without searching depth 1 (searching depth 1 has sometimes led to weird eval jumps)
Tune search parameters

Time management
Make better use of the given time in games with increment

UCI
Include seldepth in UCI info
No longer print the last uci info twice

Bugfixes
Fix replacement scheme in transposition table (could cause duplicate entries)
Disable reverse futility pruning in PV nodes (could lead to missing checkmates)
Match against previous version
Chess960, 8s + 0.08s

Score of Fatalii 0.6.0 vs Fatalii 0.5.0: 265 - 113 - 122  [0.652] 500
...      Fatalii 0.6.0 playing White: 140 - 52 - 58  [0.676] 250
...      Fatalii 0.6.0 playing Black: 125 - 61 - 64  [0.628] 250
...      White vs Black: 201 - 177 - 122  [0.524] 500
Elo difference: 109.1 +/- 27.4, LOS: 100.0 %, DrawRatio: 24.4 %


Rating CEDR progres - Fatalii
Pl Engine Rating Score Games %
1618 Fatalii 0.5.0 2388.6 44.50 340 13.09
1687 Fatalii 0.2.1 2290.7 6.50 64 10.16
1746 Fatalii 0.4.0 2173.4 12.50 86 14.53
1756 Fatalii 0.2.0 2163.6 3.50 74 4.73
1759 Fatalii 0.3.0 2161.7 9.00 82 10.98
1789 Fatalii 0.3.1 2084.5 13.00 155 8.39
1962 Fatalii 0.1.2 1420.5 0.50 26 1.92


Fatalii 0.6.0 download 

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