Black to move and win.
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1. …..Ra2!! Threat 2……Ra8#
A> 2. Kb8. Rb7+. 3. Kc8. Ra8#!
B> 2. Rb1. Ra8+. 3. Rb8. Re8+. 4. Kc7. Raxb8 winning a rook and the game.
C> 2. Rg6+. fxg6. 3. Ra1. Rxa1. 4. Kb8. Rb7+. 5. Kc8. Ra8#
D> 2. ~move. Ra8#!
Dear K.V.
Solution A does not work, because of:
3. Kxb7.
Hariharan,
You have forgotten that you are seeing from white side.
1…Rbb7 2.h7 Rec7+ 3.Kd8 Rd7+ 4.Kc8 Ke7 5.h8=Q Rdc7#
What about:
1. . . Ke6
If:
2. Kd8 Rb8 mate
If:
2. h6-h7 (or any other white move) Re8+
3. Kc7 R(8)b8
4. h7-h8(Q) R(1)b7 mate
If on move 2 or 4
Rg6+ g7xg6
which only delays the mate by one move.
Thanks to Mesilah and Prof S.G.Bhat for pointing out 3.Kxb7. A good example of my lost perspective.
But Mesilah, your 1. ……Ke6 and 4. Rb1b7 is not mate for white has 5. Kxc6.
Prof’s 1……Rb7 is correct and if 4. Ke8 (instead of 4. Kc8), now Ke6!. And black will mate in a couple of mates utmost with Rb8#
Cheers!
Happy New Year to all dear chess friends!
Hariharan : 1…R1b7 2.h7 .Rec7+ 3.Kd8 Rcd8 4.Ke8 Ke6 then i play for white 5.Rh6+ f6 6.Rxf6 Kxf6 7.h8Q+ Rg7 8.Qh6 Rh6 xg6 mate (so 1-0).
Please retry 🙂
White probably defends best with 2.Rg7 in order to give up a rook to deny the short mate Prof. Bhat describes, but I am guessing there is a forced mate, still, in there somewhere in the 15th or so move. I just can’t quite decide how black should force it after white takes at f7 with check to give up the rook.
1…Rbb7 2.Rg7 Rec7+ 3.Kd8 Rd7+ 4.Kc8 Ke7 5.Rxf7+ Kxf7 6.Rb1 i doubt whether there is forced mate by 15th move.
I hadn’t even seen Rb1 in that line. You are likely right- the forced mate is further than I thought. While the white king is still trapped on the 8th rank after the exchange of rooks at b7- an exchange I don’t see how black evades without costing even more time- white will have some delaying moves requiring attention (like attacking the remaining rook or pushing h-pawn). So, likely forced mate in 20 moves total, or less????
The reason for the delay can be attributed to not enough room on the 7th rank for the rooks.
How about 1…Ke6 and if 2. h7 Kd6!! Then 3. h8=Q doesn’t help because 3…Rc7+ 4. Kd8 Rb8++.
1…Ke6 2.h7 Kd6 3.Rh6+ and white wins.
After 1…. Ke6 2.h7 black’s best may be perpetual check by 2… Re8+
1…Ke6 2.Rg8 Rbb7 3.h7 Rec7+ 4.Kd8 Rd7+ 5.Kc8 again leads to perpetual.
1…Rbb7 2.h7 Rec7+ 3.Kd8 Rd7+ 4.Ke8 Now why not 4…. Re7+ 5.Kf8/Kd8 Rb8#
From a practical point of view..
R2-b7 at least draws so play it.
Click here to go through actual game. link to the game
The actual game ended in draw.Possibly time trouble or reluctance to take risk.
Yancey,
1…Rbb7 2.Rg7 Rec7+ 3.Kd8 Rd7+ 4.Kc8 Ke7 5.Rxf7+ Kxf7 6.Rb1
I thought this move could make inordinate delay as 6… Rxb1 7.Kxd7 and white K is out of jail. However 6…. Rdc7+ 7.Kd8 Re7 This forces white to exchange rook with black still in control of 7th rank.
8.Rxb7 Rxb7 9.Kc8 Re7 10.h7 This immediate move delays mate by 3 moves as WK attacks unsupported R later on 12th move.10…. .Kg7 11.h8=Q+ Kxh8 12.Kd8 Rg7 13.Ke8 c4 14.e4 This is played only after …. c4 is played to delay by one move.14…. c3 15.Kd8 c2 16.Kc8 c1=Q 17.Kd8 Qa3 18.Kc8 Qa8# I think this is the least number of moves required for mate.