Author: Miguel A. Ballicora
Date: 11:51:26 12/28/01
Go up one level in this thread
On December 27, 2001 at 17:28:34, Sune Larsson wrote: >On December 27, 2001 at 16:20:08, Miguel A. Ballicora wrote: > >>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: >>>> >>>>> >>>>> 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 > > > Black's Ke6 is always met by Ke4 - as black's Kg6 is always met by Kf4. > So it's not easy for black to get his king to f5. But say he manages. > That would lead to the position you refered to above: > > [D]4Q3/8/3K4/1p3k2/1q6/8/8/8 w - - 0 1 > > And this is a TB-draw. Yuck! Well, if this is about testing computers, we better modified the endgame and add two pawns in a6 and a5. [D]8/3k2p1/p3pp2/Pp2PP2/1PpP2P1/8/4K3/8 w - - 0 35 Now, the only best move should be d5 since the pawn endgame is easily won. Can the programs find it now? 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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