Author: Tord Romstad
Date: 13:09:50 07/23/03
Go up one level in this thread
On July 23, 2003 at 15:24:18, Matthew White wrote:
>[D]8/5p1k/6pp/8/q2QB3/2K4P/1p3P2/8 b - - 0 45
>
>From Levin (2331) - IM Donaldson, Western States Open 2003 (analysis)
>The move actually played was 45... Qa1? 46. Bxg6+!! and draw by perpetual check
>Can your engine find the winning 45... b1=N+!! 46. Bxb1 Qa1+ and black enters
>the endgame a pawn up
>
>Every engine that I have tested finds it eventually. However, some do take
>longer than others :).
Really? Which programs need time to find this move? Gothmog finds it at ply 1
after 0.00 seconds:
1 -0.62 0.00 6 a4d4 c3d4
1 > -0.62 0.00 72 b2b1N
1 1.74 0.00 134 b2b1N e4b1 a4a1 c3d3 a1b1 d3e3
2 1.74 0.00 858 b2b1N e4b1 a4a1 c3d3 a1b1 d3e3
3 2.07 0.01 1892 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2
4 2.07 0.02 5245 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2
5 2.31 0.13 25439 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 f7f5 d4d7
h7h8
6 2.12 0.24 49236 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 b1c2 e2f1
c2c1 f1g2
7 2.25 0.57 133399 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 b1h1 d4f6
h1d5
8 2.23 1.74 448236 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 b1c1 d4d2
c1h1
9 2.16 5.69 1564170 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 b1b3 h3h4
b3c2 e2f1 c2c1 f1g2
10 2.12 13.98 3946148 b2b1N e4b1 a4a1 c3d3 a1b1 d3e2 b1b3 h3h4
b3e6 e2f1 e6c6 f1g1
Thanks for the test! In fact I implemented underpromotions in Gothmog
yesterday, and now I know that it works! :-)
Tord
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