A fast, powerful method for detecting identity by descent.

By Brian L. Browning, Sharon R. Browning. American Journal of Human Genetics, 2011

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Haplotype phasing: Existing methods and new developments (2011, background): “The IBD that is useful in this context is that which is due to a recent shared ancestor, such as within the past 20 generations, which leads to detectable long segments of IB”
Second-generation PLINK: rising to the challenge of larger and richer datasets (2014, methodology): “) (Note that newer algorithms such as BEAGLE’s fastIBD [41] generate more accurate IBD estimates than PLINK -Z-genome.”
Fast and accurate long-range phasing in a UK Biobank cohort (2015, neutral): “First, identifying IBD is difficult both in terms of accuracy and computational cost; moreover, the most widely used IBD inference methods rely on first phasing the data [30–32].”
Low concordance of multiple variant-calling pipelines: practical implications for exome and genome sequencing (2013, methodology): “Hence, we did not evaluate pipelines that specifically employ imputation or multi-unrelated-sample variant-calling algorithms, such as Thunder [56], IMPUTE2 [57-59], or BEAGLE [60,61], or specific procedures within the software tools used that allow for calling of multiple unrelated sample (such as ”