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May-25-12
 | | chrisowen: Traverse eg ko 83.rg5+ or h7? You one idea think it aint wobble given hook rook cam f6 and draw cab in g5 takes a pawn push h7 and elope king air goes right check rooke1 the main point left a kit rook sac one stop is it from in.
83.g5+ kxg5 84.h7 re1+ 85.kd7 rd1+ 86.ke8 re1+ 87.k8 r1 88.kg7 |
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May-25-12
| | chrisowen: Not too difficult " hcf " hanging clop frame, nip and tick at one stage surmount he have recline on the too linger booth an monarch escort it to leave in promote nigh h8 or f8 crack it open in shut. Mean smooth finish brook it wallow engage too many it surge in side low cant catch either in manage put in good it down in almost a gg rook slide ar eg nifty it thing in pawn it secret aria f and h combine too kick leg home gorgon rook ewok sacrifice g5 lion it ratchet look see i. |
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| May-25-12 | | dragon player: White has two far advanced pawns. You should distract the pieces which prevent the pawns from promotion. Therefore I think this is the solution: 83.Rg5+! Kxg5
If 83...Kxh6, than... hmmm, I don't anything. Hang on, this works: 84.Rg8!. Black can give a lot of checks, but white just walks down to the second rank via this route: d5-e4-d3-e2. 84.h7
and black can't stop both pawns.
Time to check.
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In the game, black tried to stop the pawns, but he couldn't
do it.
5/5 |
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| May-25-12 | | TimothyLucasJaeger: Black threatens to win white's f-pawn, so white needs to take action. 1) <83 Re2>, intending to meet Rxf7 with Rg2+ and Kxf7, is repulsed by <83 ... Rf6+ 84 Ke7> (84 Ke5 Rxf7 85 Rh1 Kh7) <84 ... Rxf7+ 85 Ke6 Rf2> (but not 85 ... Rh7 86 Rg1+ Kxh6?? 87 Kf6) <86 Rh1 Kh7>. 2) <83 h7>, threatening to meet the capture of the f-pawn with promotion of the h-pawn, fails to <83 ... Rf6+ 84 Ke7> (84 Kd5 Kxh7) <84 ... Rxf7+ 85 Ke6 Rxh7> 3) <83 Rh5> doesn't work because of simply <83 ... Rf6+> (or 83 ... Rxf7 at once) followed by Rxf7 4) <83 Rf5> runs into <83 ... Rxf5 84 h7 Kxh7 85 Rxf5 Kg7 86 Re6 Kf8> 5) <83 Rg5+ Kxg5> (otherwise Rf5 wins for white) <84 h7> and black has no recouse but to check the white king, which can hide at f8. Then white can try Ra1 intending h8=Q Ra8+ but then the f-pawn queens. So the last try after white's Kf8 is Rh1, but white simply replies Kg7 and black must resign. |
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| May-25-12 | | TimothyLucasJaeger: whoops slight miscalculation 83 Rg5+ Kxh6 84 Rf5 doesn't win for white, 84 Rg8 is the move |
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| May-25-12 | | David2009: It takes nerve to play 83.Rg5+ over the board
click for larger view
seeing 83.Kxg5 84.h7 Re1+ 85.Kd7 Rd1+ 86.Ke7 Re1+ 87.Kf8 and a Pawn queens. Setting the ending up on Crafty End Game trainer the robot rolls over without a fight with 83...Kxh6?? 84.Rg8 etc (link: http://www.chessvideos.tv/endgame-t...) and I mated in nine (!) moves. Perhaps the site is overloaded. We can't have this, so I set it up again to begin after 83.Rg5+ Kxg5 (link http://www.chessvideos.tv/endgame-t...). This time the robot defended more sensibly, entering a Q vs R ending. I duly won its R after 26 moves and mated on move 33. I then looked up the position after 83.Rg5+ on a Nalimov table base http://www.lokasoft.nl/tbweb.aspx and found it to be a mate in 24 more moves. Have fun bettering my mate in 33! |
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| May-25-12 | | IMRKs: <TimothyLucasJaeger> 83.Rg5+ 83.Kxh6 84.Rg8 wins not 84.Rf5 |
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| May-25-12 | | TheoNov: Got this one instantly. <Abu Dina> I agree, "difficult" is a bit of a stretch. <David2009 Namilov table base> Great link! Thanks! Very instructive seeing the optimal solution to the Q vs. R endgame. |
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| May-25-12 | | Marmot PFL: As sometimes happens I found this more quickly then the prior, supposedly easier problem. Basically h7 and most most rook moves fail to Rf6+, 83 Rg5+ works as after Kxg5 84 h7 Re2+ 85 Kd7 Rd1+ 86 Ke8 Re1+ 87 Kf8 the checks run out and black's rook can't reach the back row in time. |
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May-25-12
 | | doubledrooks: Blew it. |
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| May-25-12 | | dzechiel: White to move (83?). White is up two pawns. "Difficult." Not a great deal of time this morning, but I saw an idea pretty quickly that I would like to explore. 83 Rg5+
I like this move mostly because it severly limits black's replies. Black has three moves to consider: - 83...Kh7
- 83...Kxh6
- 83...Kxg5
The first two moves
83...Kh7
or 83...Kxh6
are both met with
84 Rg8
and black now has no good way to stop white from promoting the f-pawn. A series of checks will only have the white king walk down the d- and e-files until the black rook is attacked. No, I think that black has to take the rook if he wants his best try. Consider... 83...Kxg5 84 h7
White now threatens 85 h8=Q. The king can't catch the h-pawn, and if the rook moves to the h-file, the f-pawn will promote instead. Black can try... 84...Re1+ 85 Kd7 Rd1+ 86 Ke8 Re8+ 87 Kf8 Rh1 88 Kg7
but now the handwriting is on the wall. Black will lose the rook for one pawn, and the other will promote unmolested. Time to check and see how long this game lasted.
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Right on the money! |
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| May-25-12 | | kevin86: I missed this one totally,not only the solution,but also the refutation of Rf5 which is Rxf5 h7 Kxh7 not Re1+ |
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| May-25-12 | | kevin86: an addendum:rook +RP and BP endings have been notoriously drawn endings-here is a rare exception |
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May-25-12
 | | Jimfromprovidence: This is the position after 83 Rg5+ Kxg5 84 h7 Re1+ 85 Kd7 Rh1 86 f8Q Rxh7+ 87 Ke6.
click for larger viewIn order to win from this position white has to get his king to the f file so he can threaten mate. This mate threat will eventually force black's king on to a square where white will check and win the rook, such as in the diagram below, with black to move. It takes about ten moves for white to force the below position or something similar.
click for larger viewHere black has to play ...Kg4 or ...Kh4, after which white follows with Qd4+, winning the rook. |
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| May-25-12 | | rilkefan: 83.Rg5+ looks forced. Happily it's also winning. Didn't check whether black can get into a lost Q vs R endgame which I would draw as white. |
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| May-25-12 | | M.Hassan: "Very Difficult" White to play 83.?
White is 2 pawns up
This is a case that proves that 2 pawns could be more vluable than a Rook in the endgame :83.Rg5+ Kxg5
84.h7 Rf6+
85.Ke7 Kg6
86.h8=Q Rxf7+
87.Ke6
King+Queen vs King+Rook
1-0
Another line could be:
83.Rg5+ Kxh6
84.Rg8 Rxf7
85.Kxf7
King+Rook vs King
1-0
A third possible line could be variation of the above like the following:
83.Rg8+ Kh6
84.Rg8 Re1+
85.Kd5 Rd1+
86.Ke4 Re1+
87.Kd3 Rd1+
88.Ke2
And no more checking by one move is possible . f pawn is Queened
1-0 |
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| May-25-12 | | Patriot: This seems very easy for a Friday. After ~15 seconds, I'm already thinking <83.Rg5+>. If <83...Kxg5 84.h7  >, since there is no way to stop both pawns. <83...Kh7 84.Rg8 >. <83...Kxh6 84.Rg8 >. |
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| May-25-12 | | VincentL: "Difficult".
My first idea 83. Rh5 fails to 83....Rxf7.
My next try is 83. Rg5+. Then if 83......Kxg5 84. h7. After 84....Rf6+
85. Ke5 Rf5+ 86. Kd4. black has no more checks and cannot stop either the
f pawn or h pawn from queening.
If 84.....Re1+ 85. Kd7 Rd1+ 86. Ke8 Re1+ 87. Kf8 Rh1 88. Kg8 Rxh7
89. Kxh7 leaving the f pawn to queen.
This must be it. Let's check. |
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| May-25-12 | | VincentL: Nailed it. |
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| May-25-12 | | Whitehat1963: First time solving a Friday puzzle. Obviously, it was too easy for a Friday. It's certainly not that I've become better overnight. |
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| May-25-12 | | 1stboard: 85 Rg5+ , a Morphy move .......
( and a nasty move to decide what to do if you are black ) |
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| May-25-12 | | e4 resigns: Is the position at move 59 a book draw? |
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| May-26-12 | | SimonWebbsTiger: Another familiar position, alas, but it doesn't detract from the beauty of Rg5! Black could have held the draw with 72...Kxh6! instead of 72...Rb6? |
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| Jun-18-18 | | Omnipotent00001: 56...Ra4 is a draw. |
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Nov-16-19
| | woldsmandriffield: 
click for larger viewThese positions are tough to defend. The attacker generally pushes the Rook pawn ahead of the Bishop pawn and once the outside pawn reaches the 6th rank, the defending King must block it - as Black has done here. White played the clever 70 Re3! If instead, 70 Rfd3 then Black should employ the Kling & Horowitz plan of attacking a pawn on the 5th rank: 70..Rf1! 71 Rd6 Rf2 72 Rd7+ Kxh6 = After 70 Re3! Rf1, however, White has 71 Ke6 winning. The move played 70..Rg1 should also have lost to 71 Kf7 Rf1 72 f6 Ra1 73 Kf8 (as usual, getting the King to the 8th rank is decisive in these endings). Black can draw by waiting: 70..Ra1 71 Kf7 Kxh6! 72 f6 Ra7+ 73 Re7 Ra8 In the game, 70..Rg1 71 Re8 Rb1 72 Ke6 was played and now Black went wrong with 72..Rb6+ losing. Instead 72..Kxh6! holds: 73 f6 Rb6+ 74 Kf7 Ra6 75 Rd8 Rb6 76 Ke7 Kg6 77 f7 Rb7+ = |
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sac: 83.Rg5+