Author: Dieter Buerssner
Date: 07:27:21 02/28/01
Go up one level in this thread
On February 28, 2001 at 05:56:27, Uri Blass wrote: >On February 27, 2001 at 08:24:14, Jorge Pichard wrote: >I helped yace by going forward and backward. > >yace liked 2.Qxd6 after 1...Qe3 so I had to tell it the moves that it wants to >play (Re8 h4 h5 Bf3 Qc1+ Kf2 Qd2+ Be2 Qf4+ Kg1 and after playing these moves it >can see the draw after enough time). > >After doing it I went back slowly and it found draw in all moves when only at >move 3 it found an alternative 3.Qd7+ with 0.09 pawns for white. > >I continue to go back. > >It needed a long time to see that there is not a good alternative to 2.Qxd6 but >after enough time it found that 2.Qd7+ has 0.00 evaluation and change its mind >to 2.Qd6. There is no need, to wait a long time here. I assume, that after Yace knew the score after Qxd6, it switched to Qd7. Just do the move on the board (i.e. by adding a variant to the movelist) and use the same method of above - just do the suggested moves rather fast. A draw score will be shown soon. Then undo the moves, and the drawscore should propagate back. This took me less than 2 minutes. >I continued to go back and it evaluated 1...Qe3 as +0.09 for white >Main line >1...Qe3 2.Qxd6 Re8 3.Qd7+ Re7 4.Qc6 Qxe4 5.d6 Qd3+ 6.Kg1 Re8 7.Kh2 Qxf5 8.Ra2 >Rd8 9.Qxb5 Rxd6 10.Qxc4+ Kg6 11.Ra7 Kh7 I am not sure, if a draw can be prooven after the white Queen is on c6. One note to people, that want to try this. Unfortunately, there is a small bug in the UCI implementation of Yace. It will clear hash tables and the learned information of subtree analysis, when the position is setup. This was a leftover from my debugging, so that I could reproduce exact node counts, sorry. This won't happen, when the game starts from the initial position, i.e. when you load the whole game. Regards, Dieter
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