Author: Ratko V Tomic
Date: 16:55:55 11/10/99
Go up one level in this thread
> I think that it is more than 20% above because there are many > positions when both kings are in check(I guess close to 20%) > and it is not the only case. Even a single king in check of the side not to move is illegal (whether you encode side-to-move or not, it still is always only one side's turn, and since for each position there is a reversed color twin, for every check you find, it is either illegal, or its reverse color twin is illegal), so the number of positions may be greater (not a product of two probabilities which would decrease the odds). Since what we may picture as a "typical" position (from human games) is not what these positions are, it's hard to say without experiments. The typical thing is that an "average" material content will produce 10^38 positions, so even a single "typical" material content case cannot be examined in full, and there are 58 million distinct material states. Checks may indeed be much more numerous here than in "normal" game positions. > There are many positions when it is possible to prove by the pawn > structure and the number of pieces that the position is illegal. Not sure that these cases would amount to much.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.