0x88

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Chess programming
Board representations 0x88 Bitboards
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The 0x88 chess board representation is a square-centric method of representing the chess board in computer chess programs. The number 0x88 is a hexadecimal integer (136₁₀, 210₈, 10001000₂). The rank and file positions are each represented by a nibble (hexadecimal digit), and the bit gaps simplify a number of computations to bitwise operations.