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/usr/share/doc/sjeng/BUGS is in sjeng 11.2-8.

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Please submit bug reports to gcp@sjeng.org
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KNOWN
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Trouble detecting variants and partner tells on chess.net. This is 
an XBoard/WinBoard Zippy problem, not related to Sjeng itself.

The 'ping' command interrupts the search.

'white' and 'black' do not always work as intended.

A condition which ends the game will stop the program when in analysis 
mode.

Loses sometimes.