Author: Koundinya Veluri
Date: 11:31:07 10/28/01
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On October 28, 2001 at 04:35:42, Rafael Andrist wrote: >On October 27, 2001 at 15:53:12, Koundinya Veluri wrote: > >>[D]7n/7P/8/8/Q7/2qN4/7K/1k6 w - - 0 1 >> >>Hi, >> >>I noticed that from this position, Crafty (along with several other programs, >>mine included), doesn't see the very simple win 1. Qb4+! by eval. By that I >>mean, given enough time, it will find that move once it searches far enough to >>see the promotion, but it doesn't recognize that trading queens here is a good >>idea. Just to see if it would win in a blitz match without TB's, I set up a >>blitz 40/5 game starting from this position, Crafty vs Yace (Yace sees that move >>immediately by eval). The game ended in a draw!! I don't know if it missed any >>other chances to win, but the first move definitely should have been Qb4+ I >>think. It's the simplest win. > >Wilhelm prefers clearly Qb1+ because the value of the passer is much higher >without queens. But indeed the position is drawn after 1.Qb1+ Kc2 2.Qxc3? Kxc3, >so you first have to find that only 2.Se1+ saves the win, which may be difficult >without TB's. > >Rafael B. Andrist Hi Rafael, I guess you mean Qb4+. The draw after 1. Qb4+ Kc2 2. Qxc3? is much easier to see for King of Kings than the win after 2. Ne1+ so IMHO avoiding 2. Qxc3 isn't a big problem. The win after Ne1+ is difficult to see but the moves are straight forward so it gets them easily. With TB's this position is extremely easy and it turns out that 1... Qxb4 leads to a longer mate. What I was pointing out though, is that it shouldn't be necessary to see the win by search (either by 1. Qb4+ Qxb4 2. Nxb4, or 1. Qb4+ Kc2 2. Ne1+ Kd2 3. Nf3+ Kc2 4. Qxc3+ Kxc3) to be able to get the initial 1. Qb4+, like in Wilhelm. Koundinya
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