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Subject: As requested - sac-crazy engine, ideal challenge (DeepSjeng personality)

Author: George Sobala

Date: 00:06:29 03/09/03


Someone posted a request a few weeks ago - he wanted an engine that would make
unsound sacrifices (like a bad Tal I suppose) that would challenge a mid-rated
human player. Of course, the problem with any decent engine is that if it sacs
something, you know you've lost!

Well I've managed to warp a Deep Sjeng personality in this direction quite
successfully. Attacks the king wildly, chucks pieces and pawns left right and
centre but is hard to beat (at Blitz) for a player rated under ICC 2000. Gets
annihalated by simple chess engines - eg mscp (ICC rating 1700 or so).

Now running as "redshift" on ICC.

Here is the personality file. Not exactly rocket science to create!

By the way - beware of a bug - the Personality Editor that comes with Deep Sjeng
doesn't save the "style" option to the file. Just use a text editor.

=======================================================================
# Deep Sjeng 1.0 personality
style=offensive
pawn=70
bishop=100
knight=100
rook=100
queen=70
bishop pair=100
mobility=400
attraction=400
pawnstructure=35
passed pawns=150
kingsafety=400
piece placement=400
maximum depth=10
strength=100
selectivity=2
extra tactics=True
limit extensions=False
lazy evaluation=True
futility pruning=True
forward pruning=True
singular extensions=True
nullmove=dynamic
tactical search=always
=======================================================================



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