Author: Tony Werten
Date: 04:44:06 11/04/05
Go up one level in this thread
On November 03, 2005 at 16:13:04, Robert Hyatt wrote: >On November 03, 2005 at 03:18:40, Mark Mason wrote: > >>Plesae make allowances if this is a well acknowledged observation, but I am >>relatively new to Comp chess and so have jst experienced it. >> >>In some of my engine to engine games (5 min blitz) on playchess server - we >>get to an ending and because my engine can "see" dozens of moves ahead accessing >>the EGTBs that I am drawn (or even lost) it will offer a draw or resignation >>straight away. >> >>In several cases, my opponent is clearly not using EGTB's and is calculating >>each move. He has had only a few seconds left and I have lots of time, but >>because I am using EGTBs I offer draw or resignation - but he would obviously >>have lost on time had we continued !! >> >>In these cases, it seems to me that there is a risk that if you are using EGTBs >>and opponent is not, you lose or deaw games that could otherwise have been won. >>It made me wonder if using then for blitz play is actually worth the gain, when >>measured against the risk I have described. >> >>I know that it is not all about winning and ELO, but I found this an interesting >>observation and wouldwelcome other views/experiences. >> >>Mark > > >The idea is not new. :) > >Crafty's "swindle mode" is based on that very observation. All moves lead to >EGTB draws, except for maybe a few that lead to losses. Crafty generates a list >of all legal moves, excludes any move that doesn't lead to a forced draw, then >it does a normal search with zero EGTB probes, and plays the best move the >search can find, which stretches the draw out as far as possible. But since we >know that we are only searching moves that lead to a draw, we can't possibly >lose... Did you try playing the worst move ? The idea is that if you play the best move, your opponent might not have any better option than to take the draw. otoh, If you play a "bad" move, your opponent might think it's ahead and refuse the draw. Tony
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