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=Bitboards=
9x9 Shogi [[Bitboards]] are defined as [[Array|array]] of two [[Quad Word|quad words]] and similar to [[Apery#Bitboards|Apery]] a , conditional compiled [https://en.wikipedia.org/wiki/Union_type union type] with 128-bit type __m128i, explicitly taking advantage of [[SSE2]] instructions <ref>[https://github.com/yaneurao/YaneuraOu/blob/master/source/bitboard.h YaneuraOu/bitboard.h at master · yaneurao/YaneuraOu · GitHub]</ref>:
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// Bitboard 本体クラス
