A more likely “Collision” refers to a circa 2012–2014, possibly named after the in-game mechanic where two heroes’ abilities “collide” (e.g., projectile clashes). Dozens of small LANs used generic names like “Collision Cup.”
Given two sequences S and T and a set M of local candidate matches produced by a seed-and-extend search, each match m ∈ M has coordinates (i_s, j_s, ℓ) and an initial score σ(m). Extra matches occur when multiple m overlap in S or T or are near-equivalent in score and alignment quality. The goal is to select a subset H ⊆ M representing the true homologous alignment(s) while minimizing false selections. Collision Cb The Extra Match Hon