SQLSTATE[HY000]: General error: 1021 Disk full (/var/tmp/#sql_3d1_0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
I wrote that the Windmill 'revolves around one of its eight neighbors'.
I meant that the Windmill revolves around one piece of either color on one
of the eight neighbor squares, not that the Windmill revolves around a
neighbor square even when that square is empty.