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⚖️ Trapped rook IV - only when can't castle to that side - #2358

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eval/trapped-rook-4
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⚖️ Trapped rook IV - only when can't castle to that side#2358
eduherminio wants to merge 6 commits into
mainfrom
eval/trapped-rook-4

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@eduherminio

@eduherminio eduherminio commented Jan 11, 2026

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FRC

Test  | eval/trapped-rook-4
Elo   | 2.97 +- 2.29 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=32MB
LLR   | 2.90 (-2.25, 2.89) [0.00, 3.00]
Games | 40118: +11516 -11173 =17429
Penta | [1036, 4747, 8193, 5004, 1079]
https://openbench.lynx-chess.com/test/2569/

Standard

Test  | eval/trapped-rook-4
Elo   | -4.69 +- 4.10 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=32MB
LLR   | -2.26 (-2.25, 2.89) [-3.00, 1.00]
Games | 10148: +2556 -2693 =4899
Penta | [166, 1301, 2251, 1216, 140]
https://openbench.lynx-chess.com/test/2570/

Excluding the impl for standard chess
e936ad6

Test  | eval/trapped-rook-4
Elo   | -6.69 +- 5.19 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=32MB
LLR   | -2.26 (-2.25, 2.89) [-5.00, 0.00]
Games | 6440: +1608 -1732 =3100
Penta | [115, 834, 1416, 770, 85]
https://openbench.lynx-chess.com/test/2573/

@eduherminio eduherminio added the FRC-gainer Gained in FRC, failed standard non-reg label Jan 12, 2026
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