05 Apr 06
Originally posted by coentjeDifficualt??
[fen]2B2RRK/2B3Pn/2k3Pr/6n1/5P2/8/8/8 w - - 0 1[/fen]
A little bit difficult maybe 😉
I will post the solution tomorrow unless it is solved earlier, then i will post a little analysis of this problem earlier.
This is, Just using my head....
Use the Bishops to repeatedly check the King.....
if they are taken, no worries, Bring the rooks out and check with them (especially g8)
if you have to sac a rook and 2 bishops so be it...
once g8 is clear
gxh7....If Rxh7+ Kg8....
or
G8=Q
by the end of it, we should have a simple endgame....
K+N vs K+P+R
and from there white may have to trade his Knight for the pawn anyway...
K vs...K+R - white wins....
05 Apr 06
Originally posted by ShinidokiYou are wrong though 😉 But tell me what your first move would be so i can tell you why that will not work, there is only one move that will work right.
Difficualt??
This is, Just using my head....
Use the Bishops to repeatedly check the King.....
if they are taken, no worries, Bring the rooks out and check with them (especially g8)
if you have to sac a rook and 2 bishops so be it...
once g8 is clear
gxh7....If Rxh7+ Kg8....
or
G8=Q
by the end of it, we should have a simple ...[text shortened]... m there white may have to trade his Knight for the pawn anyway...
K vs...K+R - white wins....
05 Apr 06
Originally posted by ShinidokiMaybe not difficult, but not quite as easy as you make it sound. Probably both 1.Bd7+ and 1.Bb7 win, but I think that 1.Bd7 leads to a slightly easier winning endgame K+R+pvs.K+R. For instance:
Difficualt??
This is, Just using my head....
Use the Bishops to repeatedly check the King.....
if they are taken, no worries, Bring the rooks out and check with them (especially g8)
if you have to sac a rook and 2 bishops so be it...
once g8 is clear
gxh7....If Rxh7+ Kg8....
or
G8=Q
by the end of it, we should have a simple ...[text shortened]... m there white may have to trade his Knight for the pawn anyway...
K vs...K+R - white wins....
1.Bd7+ Kxc7 (Kxd7 is similar) 2.Rc8+ Kd6 (Kxd7 loses much faster) 3.Rc6+ Kxd7 4.Rd8+ (the crucial clearing move to free the king) Kxc6 5.g8=Q Nf8+ 6.Kg7 Rxg6 7.Kxf8 Ne6+ 8.Qxe6 Rxe6 9.Kf7 and wins.
Or what do I miss?
05 Apr 06
Originally posted by Mephisto2Almost right, only 1.Bb7+! wins 🙂
Maybe not difficult, but not quite as easy as you make it sound. Probably both 1.Bd7+ and 1.Bb7 win, but I think that 1.Bd7 leads to a slightly easier winning endgame K+R+pvs.K+R. For instance:
1.Bd7+ Kxc7 (Kxd7 is similar) 2.Rc8+ Kd6 (Kxd7 loses much faster) 3.Rc6+ Kxd7 4.Rd8+ (the crucial clearing move to free the king) Kxc6 5.g8=Q Nf8+ 6.Kg7 Rxg6 7.Kxf8 Ne6+ 8.Qxe6 Rxe6 9.Kf7 and wins.
Or what do I miss?
Black threatens mate. In order to win, White must vacate g7. This calls for a check by the Rg8, which calls for a check by Rf8 - which calls for a line-opening bishop sacrifice.
1.Bb7+!
Why 1.Bd7+ doesn't work will be explained later. If Black does not capture a bishop now, White will have less trouble liberating the North-East corner. There are two variations.
a) 1...Kxc7 2.Rc8+ Kb6 3.Rc6+
After 3...Kxb7 4.Rb8+ Kxc6 5.g8Q Nf8+ 6.Kg7 Rxg6+ 7.Kxf8 Ne6+ 8.Qxe6+ Rxe6 9.Kf7 White wins the rook ending. The thematic defence is
3...Kb5
when Black hides behind the white pieces. A strange hunt develops:
4.Ba6+ Ka5 5.Rc5+ Ka4 6.Bb5+ Kb4 7.Rc4+ Kb3 8.Ba4+ Ka3 9.Rc3+ Ka2 10.Bb3+ Kb2 11.Rc2+ Kb1 12.Ba2+ Ka1 13.Rc1+
This could go on forever, if not for the edge of the board:
13...Kxa2 14.Ra8+ followed by 15.g8Q, and White wins.
b) 1...Kxb7 2.Rb8+ Kc6 3.Rb6+
and now the dark-squared bishop joins the hunt:
3...Kc5
(or 3...Kxc7 4.Rc8+ Kxb6 5.g8Q and White wins)
4.Bd6+ Kd5 5.Rb5+ Kd4 6.Bc5+ Kc4 7.Rb4+ Kc3 8.Bd4+ Kd3 9.Rb3+ Kd2 10.Bc3+ Kc2 11.Rb2+ Kc1 12.Bd2+ Kd1 13.Rb1+ and Rg8 finally gets its check.
The thematical try
1.Bd7+? does not work, because after
1...Kxd7!
the black king gets too close:
2.Rd8+ Kc6 3.Rd6+
If Black tries to hide now, White wins as above, but Black draws with
3...Kxc7! 4.Rc8+ Kxd6 5.g8Q
After 5.Rd8+ Ke7! both promotions only draw; 6.g8Q Nf8+ 7.Kg7 Rxg6+ etc., or 6.g8N+ Kxd8 7.Nxh6 Nf8
5...Nf8+ 6.Kg7 Rxg6+ 7.Kxf8 Ne6+ 8.Qxe6+ Kxe6 and now the rook ending is a draw.
05 Apr 06
Originally posted by coentjeThat is brilliant. I missed that because I counted on the minor promotion after 5.Rd8+ if black took on 1.Kxd7 (and not c7) but didn't look far enough.
Almost right, only 1.Bb7+! wins 🙂
Black threatens mate. In order to win, White must vacate g7. This calls for a check by the Rg8, which calls for a check by Rf8 - which calls for a line-opening bishop sacrifice.
1.Bb7+!
Why 1.Bd7+ doesn't work will be explained later. If Black does not capture a bishop now, White will have less trouble liberating the ...[text shortened]... d8 7.Nxh6 Nf8
5...Nf8+ 6.Kg7 Rxg6+ 7.Kxf8 Ne6+ 8.Qxe6+ Kxe6 and now the rook ending is a draw.
05 Apr 06
Originally posted by Mephisto2Composed by Emil Melnichenko (New Zealand)
That is brilliant. I missed that because I counted on the minor promotion after 5.Rd8+ if black took on 1.Kxd7 (and not c7) but didn't look far enough.
I will post another one from the same competition in a little while if you are interested, this was the winner.