Author: Dave Gomboc
Date: 07:43:47 09/08/00
Go up one level in this thread
On September 08, 2000 at 09:46:36, Stephen A. Boak wrote: >On September 08, 2000 at 01:05:22, Howard Exner wrote: > >>A nice win by Gelfand. >>[D]3k4/2pP2b1/3p2P1/1K1P1BP1/8/8/8/8 w - - >> >> >> id Gelfand,B - Ye Jiangchuan; bm Kc6; >> >>In the game Gelfand played Kc6 and Ye Jiangchuan resigned. >>The winning technique as explained on Kasparov's site explains >>that white's bishop must go to either a4 or e8, allowing the white king to >>penetrate via the f5 square. Both work nicely, yet it made me wonder if computer >>programs will discover this winning technique. How do programs >>fair here? The theme of first protecting the d7 pawn with the king, then >>with the bishop(on a4 or e8), and finally marching the king around to the >>kingside may prove difficult for programs. > >Somebody me help me analyze a clear win here. I sure can't find it, even with >Fritz6's help. > >I tried the case of Be8 (suggested by Shipov as winning). > >I tried Fritz6a and it couldn't find the win, even after I played out many of >the moves in the supposed winning strategy (specifically, positioning B on e8, >and then bringing the white king back to f4 or g4 area). > >It looks to me like black can set up a dynamic (changing) fortress in that event >(Be8) which holds the draw. > >Until Be8 is achieved by white, Black shuffles his Bishop on the long diagonal. > >After Be8 is achieved by white (with white K on c6): > >STEP 1: Black plays his king to e7 (keeping white king from f6 entry) after >white king leaves c6 to go to b5 to return to kingside; then > >A. While both g5 & g6-pawns still exist: > >Corresponding squares for black Bishop (BB) to go to, for each white king (WK) >square: >WK BB >f5 g7 >h5 g7 >[Thus white can't sac while his king is on f5 or h5, since BB will block the >g-pawns. White's king must be *behind* the g5 pawn (not beside it), prior to >sac of g6-pawn.] > >e4 e5 or h8 (not g7) >f4 e5+ or h8 >g4 e5 or h8 >h4 e5 or h8 > >B. White sac's the g6-pawn with g6-g7 (while white king starts *behind* >g5-pawn): > >WK BB >g7 xg7 >f5 b2 or c3 (long diagonal) >h5 b2 or c3 (long diagonal) >g6 c1 or d2 (attack g5) >h6 c1 or d2 (pin g5) > >after any g5-g6 push, Black easily gets to g7, keeping out the white king from >h6 or f6. > >So, where is the forced win, with Be8? > >--Steve I don't know about Be8, but I think Ba4 might work... you get the White king to f4/g4 (to move to f5 next), place the white bishop on c6, by now the Black king sits on e7 (to prevent Kf5), so sacrifice the d-pawn by promoting it, thereby allowing Kf5-g6 and winning? That is a 15-second analysis, it could be completely incorrect. :) Dave
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.