Author: Slater Wold
Date: 19:45:57 07/26/02
Go up one level in this thread
On July 26, 2002 at 18:14:08, Dieter Buerssner wrote: >On July 26, 2002 at 16:55:27, Slater Wold wrote: > >>On July 26, 2002 at 14:53:33, Dieter Buerssner wrote: >> >>>On July 26, 2002 at 00:54:10, Slater Wold wrote: >>> >>>>8/pR4pk/1b2p3/2p3p1/N1p5/7P/PP1r2P1/6K1 b - - 0 31 >>>> >>>>The only move to make here is Rxb2. The win is only about 10 moves away, and >>>>while some programs I tested find Rxb2, none have an impressive score. And >>>>that's *if* they find it. >>> >>>What would be an impressive score? According to several GMs, Rxb2 is a forced win. The win is a bit deeper than the first position. I would be impressed by a *correct* PV and any score, but a little dismayed with a 0.50 score. Anything +1.50 or so would impress me. >You cited everything, but you did not answer my question. > >>>Is this won for black? I cannot see it ... >>Both postions are confirmed wins for black after Rxb2. >> >>One is deep and one is deeper. > >Cann you please show a sample (or even a convincing) winning line in the second >position after This was the annotation of the game (of the 2nd position): Tylkowski - Wojciechowski, Poznan City Championship, 1931 1.f4 d5 2.e3 c5 3.Nf3 Nc6 4.Bb5 Bg4 5.O-O e6 6.d3 Be7 7.Nc3 d4 8.Nb1 Nf6 9.e4 O-O 10.Bxc6 bxc6 11.c3 dxc3 12.Nxc3 Bxf3 13.Rxf3 Ng4 14.Kh1 Qd4 15.Qg1 Qxg1+ 16.Kxg1 Bd8 17.Be3 Nxe3 18.Rxe3 Bb6 19.Rd1 h6 20.e5 f6 21.exf6 Rxf6 22.Rf3 c4+ 23.d4 c5 24.d5 exd5 25.Rxd5 Kh7 26.Rd7 Rd8 27.Rb7 Rg6 28.Rg3 Rxg3 29.hxg3 Rd2 30.Na4 (see diagram) 30...Rxb2 31.Nxb2 c3 32.Rxb6 c4 33.Rb4 a5 34.Nxc4 c2 Without support on the fourth rank, 34.Rxc4 cxb2 35.a4 b1=Q+ etc. is pointless. 35.Nxa5 c1Q+ 36.Kh2 Qc5 37.Rb2 (37.Ra4? Qh5+ and Qd1+, winning the rook, or 37.Rb3 Qxa5 38.a3? Qh5+ to the same effect, but after 37.Rb3 followed by Rf3, it is not entirely clear how Black will undo the fortress.) 37...Qxa5 38.g4 Qe1 39.g3 h5 40.gxh5 Kh6 and after 15 more moves, White resigned. The black King will now reach g4 and f3. It is regarded by several GM to be the "only move". >30...Rxb2 31. Nxb2 c3 32. Rxb6 c4 33. Rb4 > >Regards, >Dieter
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