Chess engine: Caissa 1.15

Caissa - UCI chess engine, Author: Michał Witanowski

Rating CEDR=3607

v.1.15:

Progression test

TC=8+0.08, Book=UHO_4060_v2.epd

Elo | 31.34 +- 6.59 (95%)

Conf | 8.0+0.08s Threads=1 Hash=16MB

Games | N: 5002 W: 1398 L: 948 D: 2656

Penta | [19, 427, 1189, 817, 49]

TC=60+0.6, Book=UHO_4060_v2.epd

Elo | 25.89 +- 10.85 (95%)

Conf | 60.0+0.60s Threads=1 Hash=128MB

Games | N: 1882 W: 519 L: 379 D: 984

Penta | [3, 156, 485, 292, 5]

TC=8+0.08, Book=8moves_v3.epd

Elo | 21.64 +- 3.28 (95%)

Conf | 8.0+0.08s Threads=1 Hash=16MB

Games | N: 10000 W: 1485 L: 863 D: 7652

Penta | [33, 580, 3192, 1122, 73]

TC=8+0.08, Book=DFRC.epd

Elo | 29.25 +- 6.94 (95%)

Conf | 8.0+0.08s Threads=1 Hash=16MB

Games | N: 4000 W: 1001 L: 665 D: 2334

Penta | [39, 335, 951, 601, 74]

Changes

This release focuses on bugfixing and search improvements. Unfortunately I wasn't able to train better net than the one used in previous release.

Fix checkmate on fifty move (#16)

Fix "nodes" stat being counted twice in quiescence search

Guard against overflowing the search stack (could happen at very long time controls)

Fix hang when reaching max depth with threads > 1

Fix bug in KPvK evaluation

Normalize reported evaluation so that +100 cp means 50% chance of winning

Improve time management

Use only one killer move

Introduce probcut

Introduce counter moves heuristics

SPSA tuning of all parameters

Many other search improvements and speedups

Caissa CEDR rating progress:

Caissa 1.15 download

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