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80ea80e451
As far as can tell, semiopenFiles are set if there is a pawn anywhere on the file. The removed condition would be true even if the pawns were very advanced, which doesn't make sense if we're looking for a trapped rook. Seems the engine fairs better with this removed. My guess s that the condition that mobility is 3 or less does this well enough. Begs the question whether this is a mobility issue alone... not sure. Should I do LTC test? STC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 13377 W: 3009 L: 2871 D: 7497 http://tests.stockfishchess.org/tests/view/5a855be40ebc590297cc8166 Passed LTC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 16288 W: 2813 L: 2685 D: 10790 http://tests.stockfishchess.org/tests/view/5a8575a80ebc590297cc817e Bench: 5006365