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Plunder raids and pruning bad captures
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Daniel Shawul



Joined: 14 Mar 2006
Posts: 2187
Location: Ethiopia
PostPost subject: Re: Plunder raids and pruning bad captures    Posted: Thu Jun 28, 2012 9:38 pm Reply to topic Reply with quote
hgm wrote:
If people prune bad captures in QS, do they make exceptions for captures with piece that were under attack already?

E.g. when I attack my opponent's Queen, and he would respond with a counter attack on my Queen, the 'obvious refutation' is usually that I make a 'suicide capture' with my Queen. Because when he now recaptures, I take his Queen, making it merely a trade.

So a counter-attack is usually a fatal mistake, but if in QS the suicide capture with the threatened Queen is not searched because it has negative SEE, the program would not see it.

Do you mean a counter-attack is rarely fatal ? I think many do not search any kind of attacking moves in QS for fear of explosions. I can see this happening in standard chess even if we consider threats to Queen (MVP). Also there is the SEE problem and even MVV/LVA will not consider it. So surely this is probably something no one explored.
Quote:

I am especially interested in this, because counter-attacks are often a prelude to a plunder raid, where the attacks are followed by actual captures. Plunder raids can only sustain themselves if each capture of the lagging side targets a new victim at least as valuable as what the opponent threatened with his last capture. (But with pieces as strong as Queen, or even stronger, that is usually possible in multiple ways.) So you are typically in a situation where both sides have a valuable piece under attack, And making the captures is usually not the most effective defense for the leading side. A suicide capture with the threatened piece is much more likely to refute the counter attack, and put an immediate end to the plunder raid.

The qsearch will consider capturing the opponent queen first. You can also try to identify this situation as perfectly as possible and apply the Queen capture that SEE tosses out. The search will stop early even if the move was a mistake since it would be a total blunder.
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Display posts from previous:   
Subject Author Date/Time
Plunder raids and pruning bad captures H.G.Muller Thu Jun 28, 2012 7:51 pm
      Re: Plunder raids and pruning bad captures Daniel Shawul Thu Jun 28, 2012 9:38 pm
            Re: Plunder raids and pruning bad captures H.G.Muller Fri Jun 29, 2012 9:18 am
                  Re: Plunder raids and pruning bad captures Daniel Shawul Fri Jun 29, 2012 11:54 am
      Re: Plunder raids and pruning bad captures Sven Schüle Fri Jun 29, 2012 8:48 am
      Re: Plunder raids and pruning bad captures Ed Schroder Fri Jun 29, 2012 12:52 pm
            Re: Plunder raids and pruning bad captures Vincent Diepeveen Fri Jun 29, 2012 8:02 pm
      Re: Plunder raids and pruning bad captures Vincent Diepeveen Fri Jun 29, 2012 7:55 pm
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