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The Center of the chessboard are the four inner squares {d4, e4, d5, e5}. Pawn placement and piece control of the center is crucial. The extended center incorporates the next concentric ring around the center, including C- and F-file as well as third and sixth rank.

Bitboards

Center

The center bitboard has the hexadecimal value of 0x0000001818000000:
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 . . . 1 1 . . .
 . . . 1 1 . . .
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Extended Center

Extended center is 0x00003C3C3C3C0000:
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 . . 1 1 1 1 . .
 . . 1 1 1 1 . .
 . . 1 1 1 1 . .
 . . 1 1 1 1 . .
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