Forum Archive :
Programming
I think there is a tendency for people to make up weaknesses of bots based
on too little evidence, or to imagine that anything that produces numbers
and says you are wrong must be perfect. It takes a lot of work to discover
the real weaknesses of bots, and of human players, for that matter.
Unless you try to have 15 checkers sent back, it won't happen, and you will
never encounter the problems with misevaluating an outside prime being
rolled home over a single checker. Bots have had more weaknesses in
backgames than this, but it is much more important that Snowie 3 often
misevaluated holding games by 0.1 cubeless (Snowie 4 is a bit better, but
still surprisingly weak there), and that Snowie 4 undervalues the blitz in
the opening, and plays strangely against a potential backgame.
Jellyfish is much too aggressive at the start of a contact bearoff, and
misevaluates containment positions and some primes terribly, and it doesn't
handle the cube as well as Snowie.
I haven't worked with BGBlitz or gnu to determine their weaknesses, but
I'd bet that they exist. I wouldn't guess their weaknesses ahead of time.
Douglas Zare
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Programming
- Adjusting to a weaker opponent (Brian Sheppard, July 1997)
- Anticomputer positions (Bill Taylor+, June 1998)
- BKG 9.8 vs. Villa (Raccoon+, Aug 2006)
- BKG 9.8 vs. Villa (Andreas Schneider, June 1992)
- BKG beats world champion (Marty Storer, Sept 1991)
- Backgames (David Montgomery+, June 1998)
- Blockading feature (Sam Pottle+, Feb 1999)
- Board encoding for neural network (Brian Sheppard, Feb 1997)
- Bot weaknesses (Douglas Zare, Mar 2003)
- Building and training a neural-net player (Brian Sheppard, Aug 1998)
- How to count plies? (Chuck Bower+, Jan 2004)
- How to count plies? (tanglebear+, Mar 2003)
- Ideas for improving computer play (David Montgomery, Feb 1994)
- Ideas on computer players (Brian Sheppard, Feb 1997)
- Introduction (Gareth McCaughan, Oct 1994)
- Measuring Difficulty (John Robson+, Feb 2005)
- Methods of encoding positions (Gary Wong, Jan 2001)
- N-ply algorithm (eXtreme Gammon, Jan 2011)
- Neural net questions (Brian Sheppard, Mar 1999)
- Pruning the list of moves (David Montgomery+, Feb 1994)
- Search in Trees with Chance Nodes (Thomas Hauk, Feb 2004)
- Source code (Gary Wong, Dec 1999)
- TD-Gammon vs. Robertie (David Escoffery, June 1992)
- Training for different gammon values (Gerry Tesauro, Feb 1996)
- Training neural nets (Walter Trice, Nov 2000)
- Variance reduction in races (David Montgomery+, Dec 1998)
- Variance reduction of rollouts (Michael J. Zehr+, Aug 1998)
- Variance reduction of rollouts (Jim Williams, June 1997)
- What is a "neural net"? (Gary Wong, Oct 1998)
- Writing a backgammon program (Gary Wong, Jan 1999)
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