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Chess engine: Stockfish 20012319

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Stockfish - UCI chess engine, compiled by Vizvezdenec

 Timestamp: 1579802605
Tweak trapped rook penalty

 This patch greatly increases the endgame penalty for having a trapped rook. Idea was a result of witnessing Stockfish losing some games at CCCC exchanging pieces in the position with a trapped rook which directly lead to a lost endgame. This patch should partially fix such behavior making this penalty high even in deep endgames.

 Passed STC
LLR: 2.94 (-2.94,2.94) {-1.00,3.00}
Total: 8528 W: 1706 L: 1588 D: 5234 Elo +4.81
Ptnml(0-2): 133, 957, 1985, 1024, 159

 Passed LTC
LLR: 2.95 (-2.94,2.94) {0.00,2.00}
Total: 88713 W: 11520 L: 11130 D: 66063 Elo +1.53
Ptnml(0-2): 646, 8170, 26342, 8492, 676

Bench: 4964462

Rating JCER=3344

 Stockfish 20012319 - download


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