Hi Alex,

If you're up for some programming, you could recognise the squares 
yourself, and pass each one separately to tesseract with the 
PSM_SINGLE_CHAR segmentation type. That should help if Tesseract is 
not segmenting each whole square separately.

If the board is always the same size, you could even do it by just 
creating a .uzn file like this:
0 0 60 60 squarea1
60 0 60 60 squarea2
120 0 60 60 squarea3
etc.

That way you're completely controlling the section segmentation. I 
suspect you'd get better results by feeding each square separately, 
though, as you can then use PSM_SINGLE_CHAR, and Tesseract has a 
better chance of taking the number in the corner into account.

As Paul suggested, though, binarisation may be an issue too. You can 
check how well it does by using the tessedit_write_images config 
setting; see 
https://code.google.com/p/tesseract-ocr/wiki/ImproveQuality#Image_processing

Nick

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