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If it is not so late, in documentation

https://docs.opencv.org/master/d9/d0c/group__calib3d.html#ga93efa9b0aa890de240ca32b11253dd4a

it is written that cv::findChessboardCornersSB is like as cv::findChessboardCorners based on this article: http://bmvc2018.org/contents/papers/0508.pdf where Harris corner-detector is used and tuned together with other algorithms.