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      ....BBBB    BBBBBB..    BBBBB...
      WW..BBBB    BBBBBBWW    BBBBB.WW
      WW...BBB    BBBBB.WW    BBBBB.WW
      WWWW.BBB    ......WW    ......WW
      WWWW.BBB    WW......    WW......
      WWWW.BBB    WW...BBB    WW...BBB
      WWWWWW.B    WWWW.BBB    WWWW.BBB
      WWWWWW..    WWWW....    WWWW....
 

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      ....BBBB    BBBBBB..    BBBBB...
      WW..BBBB    BBBBBBWW    BBBBB.WW
      WW...BBB    BBBBB.WW    BBBBB.WW
      WWWW.BBB    ......WW    ......WW
      WWWW.BBB    WW......    WW......
      WWWW.BBB    WW...BBB    WW...BBB
      WWWWWW.B    WWWW.BBB    WWWW.BBB
      WWWWWW..    WWWW....    WWWW....
 

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And the last lot:

      ..XXXX..    .BBBBBB.    .....WWW
      ..XXXX..    .BBBBBB.    B.....WW
      WW......    W.......    BBBB..WW
      WW.....B    W......B    BB.....W
      WWWW...B    WWWW.BBB    BB.....W
      WW.....B    WWWWWBBB    BB.WWWWW
      WW....BB    WWWWWBBB    B...WWWW
      WW.BBBBB    WWWWWW.B    B.......
 

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      BBBBB...    BBBBBBB.    BBBBBBB.
      BBBB....    BBBBBBB.    BBBBBBB.
      BBBB..WW    BBBBBB..    BBBWWWWW
      BBBB..WW    B......W    BBBWWWWW
      BB....WW    B......W    B..WWWWW
      ......WW    ..WWWWWW    B..WWWWW
      ......WW    .WWWWWWW    B..WWWWW
      .WWWWWWW    .WWWWWWW    ...WWWWW
 

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      BBBBB...    BBBBBBB.    BBBBBBB.
      BBBB....    BBBBBBB.    BBBBBBB.
      BBBB..WW    BBBBBB..    BBBWWWWW
      BBBB..WW    B......W    BBBWWWWW
      BB....WW    B......W    B..WWWWW
      ......WW    ..WWWWWW    B..WWWWW
      ......WW    .WWWWWWW    B..WWWWW
      .WWWWWWW    .WWWWWWW    ...WWWWW
 

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And maps 4-6:

      ....BBBB    BBBBBB..    BBBBB...
      WW..BBBB    BBBBBBWW    BBBBB.WW
      WW...BBB    BBBBB.WW    BBBBB.WW
      WWWW.BBB    ......WW    ......WW
      WWWW.BBB    WW......    WW......
      WWWW.BBB    WW...BBB    WW...BBB
      WWWWWW.B    WWWW.BBB    WWWW.BBB
      WWWWWW..    WWWW....    WWWW....
 

Please note that rectanglese of B,W,X are not necessarily minimal. They may contain empty ranks or files, possibly at the boundary.

1/(2)

Please note that rectanglese of B,W,X are not necessarily minimal. They may contain empty ranks or files, possibly at the boundary.

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The first three maps at better resolution:

      BBBBB...    BBBBBBB.    BBBBBBB.
      BBBB....    BBBBBBB.    BBBBBBB.
      BBBB..WW    BBBBBB..    BBBWWWWW
      BBBB..WW    B......W    BBBWWWWW
      BB....WW    B......W    B..WWWWW
      ......WW    ..WWWWWW    B..WWWWW
      ......WW    .WWWWWWW    B..WWWWW
      .WWWWWWW    .WWWWWWW    ...WWWWW