Encode a 3 x 3 tic-tac-toe board into a single 18-bit string [EMPTY = 00, X = 10, O = 01]
Create a mask for all non-empty tiles in a separate 18-bit string. Use predefined winning game-layout bitstrings (horizontal, vertical, diagonal)
/* 01 00 00 00 01 00 00 00 01 */ 0x10101,
/* 00 00 01 00 01 00 01 00 00 */ 0x01110,
/* 01 01 01 00 00 00 00 00 00 */ 0x15000, // shift thrice to drop a row
/* 01 00 00 01 00 00 01 00 00 */ 0x10410, // shift once to move a column
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