Author: Komputer Korner
Date: 13:27:20 05/14/05
I don't have the Bookup program but it looks like CPT is giving it a run for it's money. CPT is freeware. The full featured Bookup is expensive. The differences will take a lot of study with both programs to determine. However one feature in the CPT online manual caught my eye. Let us say you have the following in your repertoire and in CPT and Bookup. ----------------------------------------------------------------------------- "1. d4 d5, 2. c4 dxc4 if you delete the position where Black just played d5 the positions of c4 and dxc4 will be deleted as well as the candidate moves themselves. The move d5 will be deleted too, because it is leading to the position which we want to delete! At the end only the move d4 is left. Now let’s say we have the same moves as above and additionally these moves too: 1. c4 d5, 2. d4 dxc4 if you delete again the same position from our first example (Black just played d5 in the same move order of the first example!), in this case dxc4 would not be deleted, because another move order is leading to this position too! For Bookup-Users: It’s important to know that really all follow-up positions and moves are deleted which are only created indirectly or directly by the position to be deleted. In Bookup this is not the case (whether by intention or not)." ------------------------------------------------------------------------------ This is tricky to understand but what this means if true is that the CPT implementation is nonsensical because you would be left with an orphan position " the position after dxc4". Then let us say that in the first example line with both move orders in the book, you decide to delete the position after 2.c4 instead of after 1...d5. In that case in CPT, the same move dxc4 will not be deleted but that doesn't make sense because of the transposition with the 2nd move order. However Bookup would delete the dxc4 position which is correct. Now instead of the first 2 deletions, let us say that you decide to delete only 2....dxc4 in the 1st move order. In that case, the dxc4 gets deleted from the 1st move order but not the 2nd. This is wrong again in CPT. However I suspect that again Bookup would be correct by deleting the dxc4 in both move orders. Can anybody confirm the final case deletion in Bookup for me?
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.