vendredi 3 juin 2011

Partie majoritaire (14)

La suite... mais non traduite pour l'équipe canadienne.

39. Rxg7
39.Rxg7 (100%)
40 votes cast

39.Rxg7 looks pretty good. We're going to have to be careful not to let their king make it over to the g- and h-files, and we'll have to bring our own king up as soon as possible to stop their queenside pawns, but actually, it's looking pretty good. We may just have them here.

Rxg7 is the only move. It blocks the bishop from attacking the advancing pawn for one more move. They cannot move the bishop to e7 or g3 to block the pawn. So we can cross a dreaded dark square. However, our rook is on a dark square and they can attack it, forcing us to waste moves as well in a cat and mouse game. In this case, we have to bring across the king to block their advancing pawns. However, again, they will have to bring up two pawns to our one. We may force them to sac the bishop for our last pawn, which I think is their only hope and would end up an easy win for us.

If they play …Be5 attacking our rook, we'll have to be very careful how we respond. I'll analyze it some more, but I was thinking maybe we should go with Rg1 to prevent their b-pawn from queening while also keeping their king from making it over to the h-file.

Riga, on 39…Be5, it looks to me like we have hamper their pawn advance with 40. Rg8+ Kd7 41. Rb1, forcing 41.b6 and they need to reposition in order to advance their pawns, giving us more time to advance the h-pawn and/or get our King into position. While Be5 forces us to move our rook, I think we gain at least a tempo.

In the case of 39.Rxg7 b5 40.Kg2 b4 41.Kf3 Be5 though, 42.Rg8+?! Kd7 43.Rb8 seems to let them off with a draw because they just march their king to the h-file, and we can no longer advance our pawn. We should be trying to keep their king away from our pawn by cutting it off with our rook. Even with an immediate 39.Be5, I think that 40.Rf7 may be stronger keeping their king boxed in.

39… b5
39...b5 (100%)
11 votes cast.

40.Kg2 (97%)
40.h4 (3%)
36 votes cast.

40.Kg2 bringing our king to the centre as soon as possible to keep their king from coming to the kingside, and to stop their pawns, and hopefully win one of them.

That looks good. 40.Kg2 voted

40.Kg2. This postion is defently winning. If we play it right we can create two weaknesses and grab a win.

40. Kg2 b4 41. Kf3 Be5 42. Rg1 b3 ( 42. Kd7 43. Ke4 Bf6 44. Rb1 ) 43. h4 Kd7. If we can get our king to e4 before they play .Be5, then we'd be set. Also we are going to need our king to stop their c-pawn from advancing too far. Incidentally, 40.Kg2 Be5? would lose immediately to 41.Rg5!, so they are going to have to advance their b-pawn a bit more first.

that last one is pretty close to what our position looks like!

Yep, the winning method always seems to involve getting our king to the centre to prevent their pawn duo from getting too far advanced.

40… b4 41. Kf3 b3 42. Rg8+ Kb7 43. Ke4 b2 44. Rg1 Be7 45. Kd3 Bf6 46. Kc2 Kc8 47. Rg6 Be5 48. h4 Kd7 49. h5 Ke7 50. Rc6 Kd7 51. Rc5 Kd6 52. Ra5 Bg7 53. Rg5 Bf6 54. Rg8 c5 55. h6 Bc3 56. h7 c4 57. h8=Q Bxh8 58. Rxh8 c3 59. Rh1. I was thinking along the lines of getting our king on c2 preventing the two passed pawns. Then we slowly advance the h pawn while forcing the king away from it. We will create the two weaknesses. Once the pawn promotes black will have to trade off its bishop. After this we will have a winning endgame.

Thanks, Darth. That looks pretty good as well.

40… b4
40...b4 (100%)
9 votes cast.

40…b4 41.Rf3 Fe5 42.Tg8 Rd7

OK, 40..b4, apparemment les blancs suivent le bon plan (avancée de leur roi à l'aile dame, pour les analyses détaillées voir le dernier post de simplechess), mais on a encore des chances de nullité.

41. Kf3
41.Kf3 (97%)
41.Rf7 (3%)
37 votes cast.

To stop their pawn advance, we should first get our K out of the way with Kf3. This allows us to followup with Rg1 or Rg2 depending on what they do next. I will await others comments.

Yeah, definitely 41.Kf3. As Averbakh noted, and Ivanchuk and Timman showed, the key to this ending is getting our king centralized and then headed over to stop their pawns. Endgames like this can go either way, but I think their pawns are far enough back, and our king close enough to the centre that we have a good chance of pulling this off.

41… Be5
41...Be5 (50%)
41...b3 (40%)
41...c5 (10%)
10 votes cast.

41…Be5 afin de placer le Fou sur la grande diagonale.

On avait vu que 41…b3 42.Rg8+! gagne pour les blancs. Je suis d'accord avec 41… Be5, par exemple 42.Rg8+ Kd7 et maintenant:
· 43.h4 c5! 44.Ke3 (44.h5 b3!) c4! 45.Rg4 b3 46.Rxc4 Ke6 et cette position est nulle.
· 43.Ke4 Bf6! (pour empêcher h4) 44.Rb8 Be7 45.Kd5 c6+! (45…Bd6 46.Rg8! a l'air de gagner pour les blancs) 46.Kc4 Ke6 47.Rg8 c5 (ou 47...Kf7 48.Rg4 Kf6!) et c'est peut-être nulle aussi.
A priori, pour gagner les blancs doivent empêcher les blancs de traverser la colonne "g". Les noirs font nulle s'ils arrivent à mettre leur roi sur la colonne "g" ou "h", même si ça coûte un pion à l'aile dame.Pour l'instant je n'ai pas vu de gain pour les blancs, allons-y alors pour 41…Fe5.

J'ai vraiment du mal à comprendre les membres de l'équipe. On a expliqué à plusieurs reprises que 41...b3 perd à cause de Rg8+, par contre les variantes après 41...Be5 sont beaucoup moins claires. Pourtant, il y a encore une majorité qui vote pour ...b3. Si quelqu'un pense avoir trouvé une amélioration après ...b3 (j'en doute), il pourrait le proposer ici avant de voter.
On a déjà eu le même problème quand une majorité avait voté pour le mauvais coup …Nxb5 au lieu de …Kd8 qui annulait facilement. Est-ce que les gens sont bêtes ou est-ce qu'il font exprès de faire perdre l'équipe?
En tout cas, c'est un mépris pour les membres de l'équipe qui passent leur temps à analyser. Sous ces conditions là, je ne vois plus aucun intérêt à participer au vote chess.


Aucun commentaire:

Enregistrer un commentaire