Just tried it myself with the C version and with 1.0.3, C: ./a.out < sudoku.txt 0.07s user 0.00s system 94% cpu 0.077 total Go: ./sudoku_v1 < sudoku.

Just tried it myself with the C version and with 1.0.3, C: ./a.out < sudoku.txt 0.07s user 0.00s system 94% cpu 0.077 total Go: ./sudoku_v1 < sudoku.txt 0.06s user 0.01s system 88% cpu 0.079 total Which seems a bit interesting...