Author: Miguel A. Ballicora
Date: 13:20:08 12/27/01
Go up one level in this thread
On December 27, 2001 at 14:22:25, Sune Larsson wrote: >On December 27, 2001 at 13:17:11, Miguel A. Ballicora wrote: > >>On December 27, 2001 at 11:13:40, Sune Larsson wrote: >> >>> >>> [D]8/3k2p1/4pp2/1p2PP2/1PpP2P1/8/4K3/8 w - - 0 35 >>> >>> This position is from a game Rocha - Spraggett, 1999. >>> White is worse here and there are several ways for him to >>> lose this position. Hecht, in his commentaries, even thought >>> that the key move is the only way for white to make the draw. >>> This ending is tricky, so I'm not 100% sure that Hecht is correct. > >> >>I think he is correct. Black threats 1.. fxe5 2. dxe5 exf5 3. gxf5 and now >>the plan is simple, Ke7-Kf7 and then g5! > > > Yes, I played through some variations like yours above, starting with > 1.Kf3 Ke7 but got stuck in drawn positions. That's why I wrote > "not 100% sure." Else it would have been just a matter of time til > Dieter would show up with a humble question like: "How does black win > after 1.Kf3? Yace...;-) Following your line above I get: > > 1.Kf3 fxe5 2.dxe5 exf5 3.gxf5 Ke7 4.Ke3 Kf7 5.Ke4 g5 and now > 6.fxg6+ Kxg6 7.Kf4 Kf7 8.Ke3 is a draw! Black can give his c-pawn, > get the e-pawn and then win the white b-pawn. But it's still a draw then. > So, right now, I don't know how to win this for black if white just > moves his king to f3,e3,e4. Ok, you went farther than me. Anyway, I still think that black wins but I cannot check it now. If black king reaches f5 (I am pretty sure that can be forced) White king is forced to d5 and black promotes first, going to and Q-endgame with an extrapawn after Qc4+. Easy to check with table bases but look like a win because of the position of the kings. This is plan to check, not a solution. If this does not work, you might be right and it is a draw. Regards, Miguel > > Sune > > > > > > >>My program Gaviota has not clue in this position (I'd be surprised if it has >>any). This is a great position and I will keep it for teaching gaviota how to >>play pawn endgames. Thanks! >> >>Miguel >> >> >>> Anyway, white has a simple and straight forward way to secure the draw. >>> >>> Theme - pawn ending: One protected passer can hold his own vs two connected. >>> >>> >>> Test: Programs with some of this knowledge should evaluate the position >>> after 1.d5! as 0.00 or close to it. >>> >>> >>>[Event "Boavista Masters"] >>>[Site "Porto"] >>>[Date "1999.12.31"] >>>[Round "5"] >>>[White "Rocha, Sergio"] >>>[Black "Spraggett, Kevin"] >>>[Result "1/2-1/2"] >>>[ECO "C02"] >>>[WhiteElo "2427"] >>>[BlackElo "2521"] >>>[Annotator "Hecht"] >>>[SetUp "1"] >>>[FEN "8/3k2p1/4pp2/1p2PP2/1PpP2P1/8/4K3/8 w - - 0 35"] >>>[PlyCount "12"] >>>[EventDate "1999.12.27"] >>> >>>35. d5 $1 exd5 36. e6+ Ke7 37. Ke3 c3 38. Kd3 d4 39. Kc2 g5 40. Kd3 Kd6 1/2-1/2 >>> >>>Sune
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