As stated by its author in 2006, Wing has gained over 100 ELO points from adding history pruning, while the published sources lack LMR. Chess 0.5 Chess 0.5X Chess 7. ![]() Another namesake was the strong Dutch program Chess 0.5X by Wim Elsenaar in the 80s, winner of DOCCC 19. The recent version has a always replace transposition table using Zobrist keys, while earlier versions used an additional depth-preferred replacement table. Chess 7.0 by Larry Atkin was a commercial program written in 6502 Assembly published in 1982/83 for various home computers. Wing performs a negamax alpha-beta search with conditional compiled (default on) PVS inside the iterative deepening framework without aspiration windows. Interestingly, this attack table layout was preserved in Winglet, when line-wise occupied states were rotated on the fly by magic multiplication and shift right. The inner six bits optimization yields to four lookup tables of 64圆4x8 bytes, that is 32-KiB each or 1/8 MiB in total for ranks, files, diagonals and anti-diagonals. Wing is a bitboard engine and determines sliding piece attacks using rotated bitboards.
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