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| Jan-12-17 | | rgr459: I didn't go through all of the variations, but got the winning idea. Getting the white king to the kingside is simply winning. Pretty good for me for a Thursday! |
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Jan-12-17
 | | Honza Cervenka: I saw the game, and I remember it, and so the solution was a bit too simple for me here. But it is very instructive and worth to remember endgame. |
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| Jan-12-17 | | Sularus: LSB vs DSB... failed to answer till the end :( |
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| Jan-12-17 | | kevin86: The drawish nature of opposite bishops is countered by the amount of pawns on the board. white's extra pawn is loaned out so that the king can penetrate the king side and gain other material. |
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| Jan-12-17 | | johngalt5579: such positions defy concrete lines but need plans. WK must attack g pawn. therefore d5+ to release the WK seems evident. run to K-side using B to stop black Q-side pawn. win BB with e pawn and mop up. I think?! |
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Jan-12-17
 | | OhioChessFan: End games are where chess reveals its innate logic. No tactical genius required, just a plan. |
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| Jan-12-17 | | YouRang: As <NBZ> pointed out above (and <4tmac> before that), it looks like black's last chance to draw occurred at move 78:
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Black is already down one pawn in the endgame, so how counter-intuitive would it be surrender another pawn? But black's main problem is not a lack of pawns, but a lack of space to maneuver (specifically, he cannot defend his backward Pg6 with either the K or B). However, for the price of just one pointless pawn, black can buy some badly needed space on the f5 light square with <78...f4!!>
click for larger view ~~~
If <79.gxf4>, then <79...Bf5> keeps the white king trapped, and now white's bishop is suffering from a lack of mobility due to Pf4. Suppose the players get into a similar position as the puzzle, say with <80.Be6 Bg5>
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Now the <81.d5+> trick doesn't work, because black has <81...Kxd5 82.Kc7 Ke4! 83.Kd6 Kf5!>
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The K guards both e6 and Pg6. Meanwhile, black's bishop can guard both e6 and Pb5. ~~~
If <79.Bxf4>, then <79...Bf5>
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Black's bishop enjoys the extra space of f5 where is guards, and is guarded by Pg6. Again, white cannot make progress with opposite colored bishops, despite having a two-pawn advantage. ~~~
So, sometimes you have to recognize if your pawn is working for you or against you. In this case, black's Pf5 was just an obstacle making it impossible for black to adequately guard Pg6. |
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| Jan-12-17 | | agb2002: White has an extra pawn with bishops of opposite color. Black's king and bishop block the white king's path to g6. This leads to consider 80.d5+ and 80.Be3 (to prevent Kb6 due to d5+). Since 80.Be3 is met with 80... Bd7 which seems to avoid zugzwang, the only move to try to win is 80.d5+: A) 80... Kxd5 81.Kc7 with the idea Kd6(8)-e7-f6 combined with e6 and/or Kxg6 looks good for White. For example, 81... Kc4 82.Kd6 Bg8 83.e6 Kxc3 84.Ke7 b4 85.Kf6 Bxe6 86.Kxe6 Kd3 87.Kf6 Ke4 88.Kxg6 b3 89.Bc1 Kf3 90.Kxh5 Kxg3 91.Kg5 wins. B) 80... Bxd5 81.Kc8 with a similar idea.
I'm not sure but I think I'd play 80.d5. |
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| Jan-12-17 | | johngalt5579: such positions defy concrete lines but need plans. WK must attack g pawn. therefore d5+ to release the WK seems evident. run to K-side using B to stop black Q-side pawn. win BB with e pawn and mop up. I think?! |
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Jan-12-17
| | OhioChessFan: I'm having a hard time with 80. d5+ Bxd5 81. Kc8 Bb3 82. Kd8 <Kd5> 
click for larger viewOne try 83. Ke7 Kc4 84. e6 Kxc3 85. Kd7 b4 86. e7 Ba4+ 87. Kd8 b3 
click for larger viewand I think that is dead drawn. |
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Jan-12-17
| | OhioChessFan: 
click for larger viewBlack to make his 82nd move. He's just cleared d5. His King can move there to attack the Pawn, and also the next square ahead for the Pawn. Bb4 keeps the Bishop off the crucial a4/e8 diagonal, so let's leave it on b3, a move away from a4 and worry about a clearance move for the Pawn advance later. I am still playing with this, I don't know if I'm missing something, but it's not as easy to break through as the game continuation. |
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Jan-12-17
| | OhioChessFan: Of course I meant <Bc4> and not Bb4 in my last post, as a move not to make as Svidler did, since it uses up a tempo that might in the future be used to get on the a4 diagonal. |
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| Jan-12-17 | | crwynn: After 80.d5+ bxd5 81.kc8 bb3 82.kd8 kd5 why play 83.ke7 when 83.kd7 wins a tempo? White only needs one to win, as your line 83.ke7 kc4 84.e6 kxc3 85.kd7 b4 86.e7 ba4+ 87.kd8 b3 continues 88.e8q bxe8 89.kxe8 b2 89.be5+ kc2 90.bxb2 kxb2 91.kf7 g5 92.hg h4 93.g6 h3 with white having the better side of a queen ending with a pawn each. |
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| Jan-12-17 | | YouRang: <OhioChessFan: I'm having a hard time with 80. d5+ Bxd5 81. Kc8 Bb3 82. Kd8 <Kd5> One try 83. Ke7 Kc4 84. e6 Kxc3 85. Kd7 b4 86. e7 Ba4+ 87. Kd8 b3 and I think that is dead drawn.>
At white move 84,
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There's no rush to play 84.e6. While black's LSB is blocked (by its own K as well as Pb5), you can play <84.Kf6!> to make more threats than black's LSB can handle even after it becomes unblocked.
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For example, <84...Kxc3 85.Kxg6!> nice that the king isn't tied to the defense of the e-pawn <85...b4 86.Kxh5 Ba4>
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Now 87.e6 followed by Be5, and either the e or h pawn will promote, while our DSB will stop black's b-pawn. |
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| Jan-12-17 | | NBZ: <OhioChessFan>
click for larger viewIn this position that you posted I thought at first that White can still try for a win: Be5+ Kc2 e8=Q+ Bxe8 Kxe8 b2 Bxb2 Kxb2 Kf7 reaching this position: 
click for larger viewBlack looks lost but can now try ... g5! hxg5 h4! (f4 is less strong: Black wants to promote the f-pawn with check) gxh4 f4 g6 f3 g7 f2 g8=Q f1=Q+ Kg7! (not Kg6? Qg2+ Kh7 Qe4+, or Ke7? Qe1+), leading to the following position which I am not sure how to evaluate, but feel like Black should have good drawing chances. 
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| Jan-12-17 | | NBZ: Ah just realized <crwynn> has already posted about this queen ending, and also why White can win by playing 83. Kd7! instead of Ke7. |
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| Jan-12-17 | | YouRang: <NBZ: <OhioChessFan> In this position that you posted I thought at first that White can still try for a win: Be5+ Kc2 e8=Q+ Bxe8 Kxe8 b2 Bxb2 Kxb2 Kf7 reaching this position: ...> In this line, after OCF's <87...b3> and the proposed <88.Be5+>
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Instead of black trying to support the b-pawn with 88...Kc2, he should let the pawn stay at b3 and start going after the kingside pawns: <88...Kd3!>
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It may continue <89.e8Q Bxe8 90.Kxe8 Ke4!>
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White's B is overloaded. It cannot save itself, prevent ...b2, and guard Pg3. Meanwhile, white's K is basically useless on the 8th rank. Black is winning! :-) |
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| Jan-12-17 | | YouRang: <NBZ: Ah just realized <crwynn> has already posted about this queen ending, and also why White can win by playing 83. Kd7! instead of Ke7.> 83.Kd7 Ba4
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Doesn't white's K now have to go to e7 anyway, lest ...b4+? |
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| Jan-12-17 | | NBZ: <YouRang>: Right, I completely missed 88. ... Kd3! I do think there is still a draw for White (starting from the position <OhioChessFan> posted), here is the best line I have been able to find for White: 89. e8=Q Bxe8 90. Kxe8 Kd3! 91. Bc1 Ke4 92. Kf7 Kf3 93. Kxg6 Kxg3 94. Kxf5 Kxh4 Kf4 
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| Jan-12-17 | | NBZ: < <YouRang> Doesn't white's K now have to go to e7 anyway, lest ...b4+?> Right! |
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Jan-13-17
| | OhioChessFan: I messed with this some more and still can't find a winning line for White. This may be a cook. |
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Jan-13-17
| | OhioChessFan: <OhioChessFan: I'm having a hard time with 80. d5+ Bxd5 81. Kc8 Bb3 82. Kd8 <Kd5> One try 83. Ke7 Kc4 84. e6 Kxc3 85. Kd7 b4 86. e7 Ba4+ 87. Kd8 b3 and I think that is dead drawn.>
<YouRang: There's no rush to play 84.e6. While black's LSB is blocked (by its own K as well as Pb5), you can play <84.Kf6!> to make more threats than black's LSB can handle even after it becomes unblocked. For example, <84...Kxc3 85.Kxg6!> nice that the king isn't tied to the defense of the e-pawn <85...b4 86.Kxh5 Ba4>
Now 87.e6 followed by Be5, and either the e or h pawn will promote, while our DSB will stop black's b-pawn.>
I missed this one. Looking at it, I don't like 86..Ba4 at all. Kc2 might be worth a look. 
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Jan-13-17
| | OhioChessFan: Meh, not finding much for Black. 84. Kf6 may be the winning move in that line. |
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| Jan-13-17 | | Sularus: spot on as always, chrisowen |
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| Jan-13-17 | | NBZ: <OhioChessFan: I missed this one. Looking at it, I don't like 86..Ba4 at all. Kc2 might be worth a look.>
86. ... Kc2 is a very interesting suggestion, and the win does not look straightforward for White. One line might go: 86. ... Kc2 87. Kg5 Ba4 88. Be3 (forced, since b3-b2 is threatened) Kd3. 
click for larger view[A] Here if 89. Bc1 Kc2 90. Be3 Kd3 allows Black to repeat.
[B] White needs to play 89. Bc5 and now:
B1: 89. ... b3 90. Ba3 Ke4 91. Bb2 Be8 92. h5! should win for White.
B2. 89. ... Ke4 90. Kf6 (I look at Bxb4 next) b3 91. Ba3 Be8 and 92. ... f4 next. I think this line is a draw.
B3. 89. ... Ke4 90. Bxb4! Kxe5 91. h5 and here it is difficult to find a defense for Black. |
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